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100 vulnerabilities by fastify
CVE-2026-7120 (GCVE-0-2026-7120)
Vulnerability from nvd – Published: 2026-07-23 02:48 – Updated: 2026-07-23 14:15
VLAI
EPSS
VEX
Title
@fastify/static vulnerable to Authorization Bypass via Non-Canonical URL Paths
Summary
@fastify/static evaluates the allowedPath callback before normalizing dot segments and duplicate path separators in the pathname used for file resolution. Versions up to and including 10.1.1 are affected. An unauthenticated attacker can bypass allowedPath restrictions by requesting equivalent non-canonical pathnames, causing files that were intended to be denied to be served anyway. The bypass does not allow access outside the configured static root by itself, it defeats path-based filtering only. The issue is patched in @fastify/static 10.1.2.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/static | @fastify/static |
Affected:
0 , < 10.1.2
(semver)
Unaffected: 10.1.2 (semver) |
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CVE-2026-15074 (GCVE-0-2026-15074)
Vulnerability from nvd – Published: 2026-07-23 03:01 – Updated: 2026-07-23 14:14
VLAI
EPSS
VEX
Title
@fastify/static vulnerable to route guard bypass via path traversal
Summary
@fastify/static up to and including version 10.1.0 fails to reject dot-dot path segments in request pathnames before the file-resolution stage. This is a bypass of the earlier fix for CVE-2026-6414, which only covered encoded forward slashes. Because the underlying send library normalizes dot segments before applying its own path-traversal guard, an unauthenticated attacker can bypass any route-scoped middleware and read files inside the static root that live under the guarded URL prefix. The bypass does not allow access outside the configured static root by itself, it defeats route-guard filtering only. The issue is patched in @fastify/static 10.1.1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/static | @fastify/static |
Affected:
0 , < 10.1.1
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CVE-2026-16117 (GCVE-0-2026-16117)
Vulnerability from nvd – Published: 2026-07-18 13:08 – Updated: 2026-07-20 15:14
VLAI
EPSS
VEX
Title
@fastify/http-proxy vulnerable to prefix escape via URL-encoded characters
Summary
Impact: @fastify/http-proxy versions up to and including 11.5.0 fail to rewrite the request prefix when the prefix segment is URL-encoded. Fastify's router URL-decodes paths for route matching, but request.url retains the original encoded form, and the prefix-rewrite step uses a literal string replace against the decoded prefix. A request that encodes one or more characters of the configured prefix therefore matches the route but skips the rewrite, so the raw encoded path is forwarded to the upstream unchanged. The upstream then decodes the path and serves it, letting an attacker reach upstream paths that the proxy was configured to hide via rewritePrefix, including internal or administrative endpoints.
Patches: upgrade to @fastify/http-proxy 11.6.0.
Workarounds: none.
Severity
10 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-20 - Improper Input Validation
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
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Affected:
0 , < 11.6.0
(semver)
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CVE-2026-15631 (GCVE-0-2026-15631)
Vulnerability from nvd – Published: 2026-07-18 12:46 – Updated: 2026-07-20 15:15
VLAI
EPSS
VEX
Title
@fastify/http-proxy vulnerable to prefix escape via WebSocket path traversal
Summary
Impact: @fastify/http-proxy versions from 9.4.0 up to and including 11.5.0 fail to validate the resolved WebSocket destination path against the configured rewrite prefix. The WebSocket routing path in WebSocketProxy.findUpstream resolves the destination via the WHATWG URL constructor, which collapses dot segments, so a crafted upgrade request with path traversal sequences can escape the rewrite prefix and reach upstream endpoints that were not meant to be exposed by the proxy. This is a variant of CVE-2021-21322 in a code path that never went through the HTTP fix in fastify/reply-from. Exploitation requires a non-normalizing WebSocket client, since browsers and the ws package normalize the request path before sending, but raw HTTP clients or downstream proxies that forward the request target unchanged make the attack reachable in production topologies.
Patches: upgrade to @fastify/http-proxy 11.6.0.
Workarounds: none.
Severity
8.7 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
1 product
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Affected:
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CVE-2026-14198 (GCVE-0-2026-14198)
Vulnerability from nvd – Published: 2026-07-01 11:29 – Updated: 2026-07-01 12:10
VLAI
EPSS
VEX
Title
@fastify/middie vulnerable to authorization bypass via encoded slash in path parameter values
Summary
@fastify/middie versions 9.1.0 through 9.3.2 decode the encoded slash %2F inside path parameter values before matching middleware paths, while Fastify's underlying router preserves the encoding during route lookup. The two layers disagree on the canonical request path, so the middleware fails to match a URL that the route handler does match. When middleware is used for authentication, authorization, rate limiting, or auditing on parameterized paths, an attacker can reach the protected handler by sending a single crafted URL with an encoded slash in the parameter position. The bypass is HTTP method agnostic and requires no authentication or special preconditions. Patches: upgrade to @fastify/middie 9.3.3. Workarounds: avoid parameterized middleware paths for security decisions, or enforce authentication at the route handler or via a Fastify hook that runs after the router has resolved the request.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
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| @fastify/middie | @fastify/middie |
Affected:
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CVE-2026-14181 (GCVE-0-2026-14181)
Vulnerability from nvd – Published: 2026-07-01 11:42 – Updated: 2026-07-01 12:05
VLAI
EPSS
VEX
Title
@fastify/middie standalone engine vulnerable to Denial of Service via malformed percent-encoded paths
Summary
@fastify/middie versions 9.1.0 through 9.3.2 fail to guard the URL normalization step used by the standalone engine when incoming request paths contain malformed percent-encoded sequences. Inputs such as an incomplete percent escape or a truncated multibyte sequence cause the underlying decoder to throw synchronously, and the exception escapes the middie normalize step and terminates the Node.js process. The bypass affects applications that call middie.run directly on the standalone engine API, causing an immediate denial of service for all connected clients until restart. Applications using the Fastify plugin path are not affected because Fastifys error handler catches the exception. Patches: upgrade to @fastify/middie 9.3.3. Workarounds: migrate from the standalone engine API to the Fastify plugin path, where the framework error handler catches the exception.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-248 - Uncaught Exception
Assigner
References
Impacted products
1 product
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Affected:
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Unaffected: 9.3.3 (semver) |
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CVE-2026-6556 (GCVE-0-2026-6556)
Vulnerability from nvd – Published: 2026-06-30 12:48 – Updated: 2026-06-30 13:30
VLAI
EPSS
VEX
Title
@fastify/express vulnerable to middleware bypass via non-string mount paths in prefixed plugins
Summary
@fastify/express versions 4.0.6 and earlier only rewrite the plugin prefix for middleware mount paths when the path argument is a string. Non-string mount paths (arrays of paths and regular expressions) are left unprefixed inside prefixed plugin scopes, so middleware registered with those forms does not match the actual prefixed request path. Applications that use path-scoped middleware for authentication, authorization, rate limiting, or auditing on routes inside a prefixed scope can be bypassed by sending a request to the prefixed route, because Fastify still matches the route but the middleware is skipped. Patches: upgrade to @fastify/express 4.0.7. Workarounds: use string mount paths instead of arrays or regular expressions in prefixed plugins, or register one use call per path.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-285 - Improper Authorization
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/express | @fastify/express |
Affected:
0 , < 4.0.7
(semver)
Unaffected: 4.0.7 (semver) |
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CVE-2026-7768 (GCVE-0-2026-7768)
Vulnerability from nvd – Published: 2026-05-04 19:14 – Updated: 2026-05-04 19:50
VLAI
EPSS
VEX
Title
@fastify/accepts-serializer vulnerable to Denial of Service via Unbounded Accept Header Cache Growth
Summary
@fastify/accepts-serializer cached serializer-selection results keyed by the request Accept header without a size limit or eviction policy. A remote unauthenticated client could send many distinct but matching Accept header variants to make the cache grow unbounded, eventually exhausting the Node.js heap and crashing the process. Versions <= 6.0.3 are affected. Update to 6.0.4 or later, which bounds the cache via an LRU with a default size of 100 entries, configurable through the new cacheSize plugin option.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/accepts-serializer | @fastify/accepts-serializer |
Affected:
0 , < 6.0.4
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Unaffected: 6.0.4 (semver) |
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CVE-2026-33804 (GCVE-0-2026-33804)
Vulnerability from nvd – Published: 2026-04-16 13:56 – Updated: 2026-04-16 14:41
VLAI
EPSS
VEX
Title
@fastify/middie vulnerable to middleware bypass via deprecated ignoreDuplicateSlashes option
Summary
@fastify/middie versions 9.3.1 and earlier are vulnerable to middleware bypass when the deprecated Fastify ignoreDuplicateSlashes option is enabled. The middleware path matching logic does not account for duplicate slash normalization performed by Fastify's router, allowing requests with duplicate slashes to bypass middleware authentication and authorization checks. This only affects applications using the deprecated ignoreDuplicateSlashes option. Upgrade to @fastify/middie 9.3.2 to fix this issue. There are no workarounds other than disabling the ignoreDuplicateSlashes option.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/middie | @fastify/middie |
Affected:
0 , < 9.3.2
(semver)
Unaffected: 9.3.2 (semver) |
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CVE-2026-6410 (GCVE-0-2026-6410)
Vulnerability from nvd – Published: 2026-04-16 13:29 – Updated: 2026-04-16 14:19
VLAI
EPSS
VEX
Title
@fastify/static vulnerable to path traversal in directory listing
Summary
@fastify/static versions 8.0.0 through 9.1.0 allow path traversal when directory listing is enabled via the list option. The dirList.path() function resolves directories outside the configured static root using path.join() without a containment check. A remote unauthenticated attacker can obtain directory listings for arbitrary directories accessible to the Node.js process, disclosing directory and file names. File contents are not disclosed. Upgrade to @fastify/static 9.1.1 to fix this issue. As a workaround, disable directory listing by removing the list option from the plugin configuration.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
1 product
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|---|---|---|---|
| @fastify/static | @fastify/static |
Affected:
8.0.0 , < 9.1.1
(semver)
Unaffected: 9.1.1 (semver) |
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CVE-2026-6270 (GCVE-0-2026-6270)
Vulnerability from nvd – Published: 2026-04-16 13:44 – Updated: 2026-04-16 14:24
VLAI
EPSS
VEX
Title
@fastify/middie vulnerable to middleware authentication bypass in child plugin scopes
Summary
@fastify/middie versions 9.3.1 and earlier do not register inherited middleware directly on child plugin engine instances. When a Fastify application registers authentication middleware in a parent scope and then registers child plugins with @fastify/middie, the child scope does not inherit the parent middleware. This allows unauthenticated requests to reach routes defined in child plugin scopes, bypassing authentication and authorization checks. Upgrade to @fastify/middie 9.3.2 to fix this issue. There are no workarounds.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/middie | @fastify/middie |
Affected:
0 , < 9.3.2
(semver)
Unaffected: 9.3.2 (semver) |
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CVE-2026-6414 (GCVE-0-2026-6414)
Vulnerability from nvd – Published: 2026-04-16 13:09 – Updated: 2026-04-16 13:48
VLAI
EPSS
VEX
Title
@fastify/static vulnerable to route guard bypass via encoded path separators
Summary
@fastify/static versions 8.0.0 through 9.1.0 decode percent-encoded path separators (%2F) before filesystem resolution, while Fastify's router treats them as literal characters. This mismatch allows attackers to bypass route-based middleware or guards that protect files served by @fastify/static. For example, a route guard on a protected path can be circumvented by encoding the path separator in the URL. Upgrade to @fastify/static 9.1.1 to fix this issue. There are no workarounds.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-177 - Improper Handling of URL Encoding (Hex Encoding)
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/static | @fastify/static |
Affected:
8.0.0 , < 9.1.1
(semver)
Unaffected: 9.1.1 (semver) |
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CVE-2026-33805 (GCVE-0-2026-33805)
Vulnerability from nvd – Published: 2026-04-15 10:13 – Updated: 2026-07-15 01:06
VLAI
EPSS
VEX
Title
@fastify/reply-from vulnerable to connection header abuse enabling stripping of proxy-added headers
Summary
@fastify/reply-from v12.6.1 and earlier and @fastify/http-proxy v11.4.3 and earlier process the client's Connection header after the proxy has added its own headers via rewriteRequestHeaders. This allows attackers to retroactively strip proxy-added headers from upstream requests by listing them in the Connection header value. Any header added by the proxy for routing, access control, or security purposes can be selectively removed by a client. @fastify/http-proxy is also affected as it delegates to @fastify/reply-from.
Upgrade to @fastify/reply-from v12.6.2 or @fastify/http-proxy v11.4.4 or later.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/fastify/fastify-reply-from/sec… | |
| https://cna.openjsf.org/security-advisories.html | |
| https://access.redhat.com/security/cve/CVE-2026-33805 | vdb-entryx_refsource_REDHAT |
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Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/reply-from | @fastify/reply-from |
Affected:
0 , < 12.6.2
(semver)
Unaffected: 12.6.2 (semver) |
|
| @fastify/reply-from | @fastify/http-proxy |
Affected:
0 , < 11.4.4
(semver)
Unaffected: 11.4.4 (semver) |
|
| Red Hat | Red Hat OpenShift Dev Spaces 3.27 |
Unaffected:
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(rpm)
cpe:/a:redhat:openshift_devspaces:3.27::el9 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
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CVE-2026-33808 (GCVE-0-2026-33808)
Vulnerability from nvd – Published: 2026-04-15 09:29 – Updated: 2026-04-15 13:10
VLAI
EPSS
VEX
Title
@fastify/express vulnerable to middleware authentication bypass via URL normalization gaps (duplicate slashes and semicolons)
Summary
Impact@fastify/express v4.0.4 and earlier fails to normalize URLs before passing them to Express middleware when Fastify router normalization options are enabled. This allows complete bypass of path-scoped authentication middleware via duplicate slashes when ignoreDuplicateSlashes is enabled, or via semicolon delimiters when useSemicolonDelimiter is enabled. In both cases, Fastify router normalizes the URL and matches the route, but @fastify/express passes the original un-normalized URL to Express middleware, which fails to match and is skipped. An unauthenticated attacker can access protected routes by manipulating the URL path.
PatchesUpgrade to @fastify/express v4.0.5 or later.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| fastify | @fastify/express |
Affected:
0 , < 4.0.5
(semver)
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CVE-2026-33807 (GCVE-0-2026-33807)
Vulnerability from nvd – Published: 2026-04-15 09:52 – Updated: 2026-04-15 13:09
VLAI
EPSS
VEX
Title
@fastify/express vulnerable to middleware path doubling causing authentication bypass in child plugin scopes
Summary
@fastify/express v4.0.4 and earlier contains a path handling bug in the onRegister function that causes middleware paths to be doubled when inherited by child plugins. When a child plugin is registered with a prefix that matches a middleware path, the middleware path is prefixed a second time, causing it to never match incoming requests. This results in complete bypass of Express middleware security controls, including authentication, authorization, and rate limiting, for all routes defined within affected child plugin scopes. No special configuration or request crafting is required.
Upgrade to @fastify/express v4.0.5 or later.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
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| fastify | @fastify/express |
Affected:
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CVE-2026-15074 (GCVE-0-2026-15074)
Vulnerability from cvelistv5 – Published: 2026-07-23 03:01 – Updated: 2026-07-23 14:14
VLAI
EPSS
VEX
Title
@fastify/static vulnerable to route guard bypass via path traversal
Summary
@fastify/static up to and including version 10.1.0 fails to reject dot-dot path segments in request pathnames before the file-resolution stage. This is a bypass of the earlier fix for CVE-2026-6414, which only covered encoded forward slashes. Because the underlying send library normalizes dot segments before applying its own path-traversal guard, an unauthenticated attacker can bypass any route-scoped middleware and read files inside the static root that live under the guarded URL prefix. The bypass does not allow access outside the configured static root by itself, it defeats route-guard filtering only. The issue is patched in @fastify/static 10.1.1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
1 product
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Affected:
0 , < 10.1.1
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CVE-2026-7120 (GCVE-0-2026-7120)
Vulnerability from cvelistv5 – Published: 2026-07-23 02:48 – Updated: 2026-07-23 14:15
VLAI
EPSS
VEX
Title
@fastify/static vulnerable to Authorization Bypass via Non-Canonical URL Paths
Summary
@fastify/static evaluates the allowedPath callback before normalizing dot segments and duplicate path separators in the pathname used for file resolution. Versions up to and including 10.1.1 are affected. An unauthenticated attacker can bypass allowedPath restrictions by requesting equivalent non-canonical pathnames, causing files that were intended to be denied to be served anyway. The bypass does not allow access outside the configured static root by itself, it defeats path-based filtering only. The issue is patched in @fastify/static 10.1.2.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
Assigner
References
Impacted products
1 product
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Affected:
0 , < 10.1.2
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CVE-2026-16117 (GCVE-0-2026-16117)
Vulnerability from cvelistv5 – Published: 2026-07-18 13:08 – Updated: 2026-07-20 15:14
VLAI
EPSS
VEX
Title
@fastify/http-proxy vulnerable to prefix escape via URL-encoded characters
Summary
Impact: @fastify/http-proxy versions up to and including 11.5.0 fail to rewrite the request prefix when the prefix segment is URL-encoded. Fastify's router URL-decodes paths for route matching, but request.url retains the original encoded form, and the prefix-rewrite step uses a literal string replace against the decoded prefix. A request that encodes one or more characters of the configured prefix therefore matches the route but skips the rewrite, so the raw encoded path is forwarded to the upstream unchanged. The upstream then decodes the path and serves it, letting an attacker reach upstream paths that the proxy was configured to hide via rewritePrefix, including internal or administrative endpoints.
Patches: upgrade to @fastify/http-proxy 11.6.0.
Workarounds: none.
Severity
10 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-20 - Improper Input Validation
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
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Affected:
0 , < 11.6.0
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Unaffected: 11.6.0 (semver) |
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CVE-2026-15631 (GCVE-0-2026-15631)
Vulnerability from cvelistv5 – Published: 2026-07-18 12:46 – Updated: 2026-07-20 15:15
VLAI
EPSS
VEX
Title
@fastify/http-proxy vulnerable to prefix escape via WebSocket path traversal
Summary
Impact: @fastify/http-proxy versions from 9.4.0 up to and including 11.5.0 fail to validate the resolved WebSocket destination path against the configured rewrite prefix. The WebSocket routing path in WebSocketProxy.findUpstream resolves the destination via the WHATWG URL constructor, which collapses dot segments, so a crafted upgrade request with path traversal sequences can escape the rewrite prefix and reach upstream endpoints that were not meant to be exposed by the proxy. This is a variant of CVE-2021-21322 in a code path that never went through the HTTP fix in fastify/reply-from. Exploitation requires a non-normalizing WebSocket client, since browsers and the ws package normalize the request path before sending, but raw HTTP clients or downstream proxies that forward the request target unchanged make the attack reachable in production topologies.
Patches: upgrade to @fastify/http-proxy 11.6.0.
Workarounds: none.
Severity
8.7 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/http-proxy | @fastify/http-proxy |
Affected:
9.4.0 , < 11.6.0
(semver)
Unaffected: 11.6.0 (semver) |
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CVE-2026-14181 (GCVE-0-2026-14181)
Vulnerability from cvelistv5 – Published: 2026-07-01 11:42 – Updated: 2026-07-01 12:05
VLAI
EPSS
VEX
Title
@fastify/middie standalone engine vulnerable to Denial of Service via malformed percent-encoded paths
Summary
@fastify/middie versions 9.1.0 through 9.3.2 fail to guard the URL normalization step used by the standalone engine when incoming request paths contain malformed percent-encoded sequences. Inputs such as an incomplete percent escape or a truncated multibyte sequence cause the underlying decoder to throw synchronously, and the exception escapes the middie normalize step and terminates the Node.js process. The bypass affects applications that call middie.run directly on the standalone engine API, causing an immediate denial of service for all connected clients until restart. Applications using the Fastify plugin path are not affected because Fastifys error handler catches the exception. Patches: upgrade to @fastify/middie 9.3.3. Workarounds: migrate from the standalone engine API to the Fastify plugin path, where the framework error handler catches the exception.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-248 - Uncaught Exception
Assigner
References
Impacted products
1 product
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| @fastify/middie | @fastify/middie |
Affected:
9.1.0 , < 9.3.3
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Unaffected: 9.3.3 (semver) |
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CVE-2026-14198 (GCVE-0-2026-14198)
Vulnerability from cvelistv5 – Published: 2026-07-01 11:29 – Updated: 2026-07-01 12:10
VLAI
EPSS
VEX
Title
@fastify/middie vulnerable to authorization bypass via encoded slash in path parameter values
Summary
@fastify/middie versions 9.1.0 through 9.3.2 decode the encoded slash %2F inside path parameter values before matching middleware paths, while Fastify's underlying router preserves the encoding during route lookup. The two layers disagree on the canonical request path, so the middleware fails to match a URL that the route handler does match. When middleware is used for authentication, authorization, rate limiting, or auditing on parameterized paths, an attacker can reach the protected handler by sending a single crafted URL with an encoded slash in the parameter position. The bypass is HTTP method agnostic and requires no authentication or special preconditions. Patches: upgrade to @fastify/middie 9.3.3. Workarounds: avoid parameterized middleware paths for security decisions, or enforce authentication at the route handler or via a Fastify hook that runs after the router has resolved the request.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
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|---|---|---|---|
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Affected:
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Unaffected: 9.3.3 (semver) |
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CVE-2026-6556 (GCVE-0-2026-6556)
Vulnerability from cvelistv5 – Published: 2026-06-30 12:48 – Updated: 2026-06-30 13:30
VLAI
EPSS
VEX
Title
@fastify/express vulnerable to middleware bypass via non-string mount paths in prefixed plugins
Summary
@fastify/express versions 4.0.6 and earlier only rewrite the plugin prefix for middleware mount paths when the path argument is a string. Non-string mount paths (arrays of paths and regular expressions) are left unprefixed inside prefixed plugin scopes, so middleware registered with those forms does not match the actual prefixed request path. Applications that use path-scoped middleware for authentication, authorization, rate limiting, or auditing on routes inside a prefixed scope can be bypassed by sending a request to the prefixed route, because Fastify still matches the route but the middleware is skipped. Patches: upgrade to @fastify/express 4.0.7. Workarounds: use string mount paths instead of arrays or regular expressions in prefixed plugins, or register one use call per path.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-285 - Improper Authorization
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/express | @fastify/express |
Affected:
0 , < 4.0.7
(semver)
Unaffected: 4.0.7 (semver) |
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CVE-2026-7768 (GCVE-0-2026-7768)
Vulnerability from cvelistv5 – Published: 2026-05-04 19:14 – Updated: 2026-05-04 19:50
VLAI
EPSS
VEX
Title
@fastify/accepts-serializer vulnerable to Denial of Service via Unbounded Accept Header Cache Growth
Summary
@fastify/accepts-serializer cached serializer-selection results keyed by the request Accept header without a size limit or eviction policy. A remote unauthenticated client could send many distinct but matching Accept header variants to make the cache grow unbounded, eventually exhausting the Node.js heap and crashing the process. Versions <= 6.0.3 are affected. Update to 6.0.4 or later, which bounds the cache via an LRU with a default size of 100 entries, configurable through the new cacheSize plugin option.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/accepts-serializer | @fastify/accepts-serializer |
Affected:
0 , < 6.0.4
(semver)
Unaffected: 6.0.4 (semver) |
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CVE-2026-33804 (GCVE-0-2026-33804)
Vulnerability from cvelistv5 – Published: 2026-04-16 13:56 – Updated: 2026-04-16 14:41
VLAI
EPSS
VEX
Title
@fastify/middie vulnerable to middleware bypass via deprecated ignoreDuplicateSlashes option
Summary
@fastify/middie versions 9.3.1 and earlier are vulnerable to middleware bypass when the deprecated Fastify ignoreDuplicateSlashes option is enabled. The middleware path matching logic does not account for duplicate slash normalization performed by Fastify's router, allowing requests with duplicate slashes to bypass middleware authentication and authorization checks. This only affects applications using the deprecated ignoreDuplicateSlashes option. Upgrade to @fastify/middie 9.3.2 to fix this issue. There are no workarounds other than disabling the ignoreDuplicateSlashes option.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
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|---|---|---|---|
| @fastify/middie | @fastify/middie |
Affected:
0 , < 9.3.2
(semver)
Unaffected: 9.3.2 (semver) |
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CVE-2026-6270 (GCVE-0-2026-6270)
Vulnerability from cvelistv5 – Published: 2026-04-16 13:44 – Updated: 2026-04-16 14:24
VLAI
EPSS
VEX
Title
@fastify/middie vulnerable to middleware authentication bypass in child plugin scopes
Summary
@fastify/middie versions 9.3.1 and earlier do not register inherited middleware directly on child plugin engine instances. When a Fastify application registers authentication middleware in a parent scope and then registers child plugins with @fastify/middie, the child scope does not inherit the parent middleware. This allows unauthenticated requests to reach routes defined in child plugin scopes, bypassing authentication and authorization checks. Upgrade to @fastify/middie 9.3.2 to fix this issue. There are no workarounds.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
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|---|---|---|---|
| @fastify/middie | @fastify/middie |
Affected:
0 , < 9.3.2
(semver)
Unaffected: 9.3.2 (semver) |
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CVE-2026-6410 (GCVE-0-2026-6410)
Vulnerability from cvelistv5 – Published: 2026-04-16 13:29 – Updated: 2026-04-16 14:19
VLAI
EPSS
VEX
Title
@fastify/static vulnerable to path traversal in directory listing
Summary
@fastify/static versions 8.0.0 through 9.1.0 allow path traversal when directory listing is enabled via the list option. The dirList.path() function resolves directories outside the configured static root using path.join() without a containment check. A remote unauthenticated attacker can obtain directory listings for arbitrary directories accessible to the Node.js process, disclosing directory and file names. File contents are not disclosed. Upgrade to @fastify/static 9.1.1 to fix this issue. As a workaround, disable directory listing by removing the list option from the plugin configuration.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/static | @fastify/static |
Affected:
8.0.0 , < 9.1.1
(semver)
Unaffected: 9.1.1 (semver) |
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CVE-2026-6414 (GCVE-0-2026-6414)
Vulnerability from cvelistv5 – Published: 2026-04-16 13:09 – Updated: 2026-04-16 13:48
VLAI
EPSS
VEX
Title
@fastify/static vulnerable to route guard bypass via encoded path separators
Summary
@fastify/static versions 8.0.0 through 9.1.0 decode percent-encoded path separators (%2F) before filesystem resolution, while Fastify's router treats them as literal characters. This mismatch allows attackers to bypass route-based middleware or guards that protect files served by @fastify/static. For example, a route guard on a protected path can be circumvented by encoding the path separator in the URL. Upgrade to @fastify/static 9.1.1 to fix this issue. There are no workarounds.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-177 - Improper Handling of URL Encoding (Hex Encoding)
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/static | @fastify/static |
Affected:
8.0.0 , < 9.1.1
(semver)
Unaffected: 9.1.1 (semver) |
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CVE-2026-33805 (GCVE-0-2026-33805)
Vulnerability from cvelistv5 – Published: 2026-04-15 10:13 – Updated: 2026-07-15 01:06
VLAI
EPSS
VEX
Title
@fastify/reply-from vulnerable to connection header abuse enabling stripping of proxy-added headers
Summary
@fastify/reply-from v12.6.1 and earlier and @fastify/http-proxy v11.4.3 and earlier process the client's Connection header after the proxy has added its own headers via rewriteRequestHeaders. This allows attackers to retroactively strip proxy-added headers from upstream requests by listing them in the Connection header value. Any header added by the proxy for routing, access control, or security purposes can be selectively removed by a client. @fastify/http-proxy is also affected as it delegates to @fastify/reply-from.
Upgrade to @fastify/reply-from v12.6.2 or @fastify/http-proxy v11.4.4 or later.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/fastify/fastify-reply-from/sec… | |
| https://cna.openjsf.org/security-advisories.html | |
| https://access.redhat.com/security/cve/CVE-2026-33805 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2458651 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:10175 | vendor-advisoryx_refsource_REDHAT |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/reply-from | @fastify/reply-from |
Affected:
0 , < 12.6.2
(semver)
Unaffected: 12.6.2 (semver) |
|
| @fastify/reply-from | @fastify/http-proxy |
Affected:
0 , < 11.4.4
(semver)
Unaffected: 11.4.4 (semver) |
|
| Red Hat | Red Hat OpenShift Dev Spaces 3.27 |
Unaffected:
1776795511 , < *
(rpm)
cpe:/a:redhat:openshift_devspaces:3.27::el9 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
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CVE-2026-33807 (GCVE-0-2026-33807)
Vulnerability from cvelistv5 – Published: 2026-04-15 09:52 – Updated: 2026-04-15 13:09
VLAI
EPSS
VEX
Title
@fastify/express vulnerable to middleware path doubling causing authentication bypass in child plugin scopes
Summary
@fastify/express v4.0.4 and earlier contains a path handling bug in the onRegister function that causes middleware paths to be doubled when inherited by child plugins. When a child plugin is registered with a prefix that matches a middleware path, the middleware path is prefixed a second time, causing it to never match incoming requests. This results in complete bypass of Express middleware security controls, including authentication, authorization, and rate limiting, for all routes defined within affected child plugin scopes. No special configuration or request crafting is required.
Upgrade to @fastify/express v4.0.5 or later.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| fastify | @fastify/express |
Affected:
0 , < 4.0.5
(semver)
Unaffected: 4.0.5 (semver) |
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CVE-2026-33808 (GCVE-0-2026-33808)
Vulnerability from cvelistv5 – Published: 2026-04-15 09:29 – Updated: 2026-04-15 13:10
VLAI
EPSS
VEX
Title
@fastify/express vulnerable to middleware authentication bypass via URL normalization gaps (duplicate slashes and semicolons)
Summary
Impact@fastify/express v4.0.4 and earlier fails to normalize URLs before passing them to Express middleware when Fastify router normalization options are enabled. This allows complete bypass of path-scoped authentication middleware via duplicate slashes when ignoreDuplicateSlashes is enabled, or via semicolon delimiters when useSemicolonDelimiter is enabled. In both cases, Fastify router normalizes the URL and matches the route, but @fastify/express passes the original un-normalized URL to Express middleware, which fails to match and is skipped. An unauthenticated attacker can access protected routes by manipulating the URL path.
PatchesUpgrade to @fastify/express v4.0.5 or later.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
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Affected:
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"value": "\u003ch3\u003eImpact\u003c/h3\u003e@fastify/express v4.0.4 and earlier fails to normalize URLs before passing them to Express middleware when Fastify router normalization options are enabled. This allows complete bypass of path-scoped authentication middleware via duplicate slashes when ignoreDuplicateSlashes is enabled, or via semicolon delimiters when useSemicolonDelimiter is enabled. In both cases, Fastify router normalizes the URL and matches the route, but @fastify/express passes the original un-normalized URL to Express middleware, which fails to match and is skipped. An unauthenticated attacker can access protected routes by manipulating the URL path.\u003cbr\u003e\u003cbr\u003e\u003ch3\u003ePatches\u003c/h3\u003eUpgrade to @fastify/express v4.0.5 or later."
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