Common Weakness Enumeration
CWE-407
Allowed-with-ReviewInefficient Algorithmic Complexity
Abstraction: Class · Status: Incomplete
An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.
313 vulnerabilities reference this CWE, most recent first.
CVE-2026-59922 (GCVE-0-2026-59922)
Vulnerability from cvelistv5 – Published: 2026-07-08 16:12 – Updated: 2026-07-09 14:40
VLAI
EPSS
VEX
Title
Mistune plugins/formatting: quadratic-time parsing on long runs of `~~x~~`, `==x==`, and `^^x^^` markers (strikethrough / mark / insert)
Summary
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a run of closed tilde, equals-sign, or caret marker pairs around a character causes quadratic work in src/mistune/plugins/formatting.py when the strikethrough, mark, or insert plugin scans for matching markers from each possible start position, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-09 14:39 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/lepture/mistune/security/advis… | x_refsource_CONFIRM |
| https://github.com/lepture/mistune/commit/96d0f57… | x_refsource_MISC |
| https://github.com/lepture/mistune/releases/tag/v3.3.0 | x_refsource_MISC |
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CVE-2026-59887 (GCVE-0-2026-59887)
Vulnerability from cvelistv5 – Published: 2026-07-08 15:58 – Updated: 2026-07-09 14:41
VLAI
EPSS
VEX
Title
linkify-it: Quadratic-complexity DoS via the `mailto:` validator scan-loop on attacker text
Summary
linkify-it is a links recognition library with full Unicode support. Prior to 5.0.2, the mailto: schema validator used by .test() and .match() can be invoked at every mailto: occurrence and scan the remaining input through src_email_name in lib/re.mjs, causing O(n^2) CPU consumption on crafted user text. This issue is fixed in version 5.0.2.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-09 14:40 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/markdown-it/linkify-it/securit… | x_refsource_CONFIRM |
| https://github.com/markdown-it/linkify-it/commit/… | x_refsource_MISC |
| https://github.com/markdown-it/linkify-it/release… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| markdown-it | linkify-it |
Affected:
< 5.0.2
|
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CVE-2026-59885 (GCVE-0-2026-59885)
Vulnerability from cvelistv5 – Published: 2026-07-14 16:40 – Updated: 2026-07-14 17:32
VLAI
EPSS
VEX
Title
pyasn1: Quadratic complexity in OBJECT IDENTIFIER and RELATIVE-OID processing allows denial of service
Summary
pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER, CER, and DER decoders process OBJECT IDENTIFIER and RELATIVE-OID values in quadratic time relative to the number of arcs, so a small crafted payload containing an OID with many arcs consumes excessive CPU per decode() call and can deny service to applications that decode untrusted ASN.1 data. The corresponding encoders have the same quadratic behavior when an application re-encodes previously decoded attacker-supplied values. This issue is fixed in version 0.6.4.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-14 17:32 UTC
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/pyasn1/pyasn1/security/advisor… | x_refsource_CONFIRM |
| https://github.com/pyasn1/pyasn1/commit/45bdb19eb… | x_refsource_MISC |
| https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4 | x_refsource_MISC |
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CVE-2026-59880 (GCVE-0-2026-59880)
Vulnerability from cvelistv5 – Published: 2026-07-08 15:44 – Updated: 2026-07-08 16:13
VLAI
EPSS
VEX
Title
Immutable.js: Hash-collision algorithmic complexity denial of service in Immutable.Map/Set
Summary
Immutable.js provides many Persistent Immutable data structures. Prior to 4.3.9 and 5.1.8, Immutable.Map and Immutable.Set keep keys that share the same 32-bit hash in a HashCollisionNode collision bucket that is scanned linearly, allowing an attacker who controls keys inserted into a Map, such as through Immutable.Map(obj), Immutable.fromJS(obj), state.merge(userObject), or mergeDeep, to craft many colliding keys and degrade insertion and lookup to consume disproportionate CPU. This issue is fixed in versions 4.3.9 and 5.1.8.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-08 16:13 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/immutable-js/immutable-js/secu… | x_refsource_CONFIRM |
| https://github.com/immutable-js/immutable-js/comm… | x_refsource_MISC |
| https://github.com/immutable-js/immutable-js/comm… | x_refsource_MISC |
| https://github.com/immutable-js/immutable-js/rele… | x_refsource_MISC |
| https://github.com/immutable-js/immutable-js/rele… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| immutable-js | immutable-js |
Affected:
< 4.3.9
Affected: >= 5.0.0-beta.1, < 5.1.8 |
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CVE-2026-59870 (GCVE-0-2026-59870)
Vulnerability from cvelistv5 – Published: 2026-07-08 15:13 – Updated: 2026-07-08 15:50
VLAI
EPSS
VEX
Title
js-yaml quadratic-complexity denial of service via YAML11_SCHEMA !!omap parsing
Summary
js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.1, YAML11_SCHEMA support for the !!omap tag in src/tag/sequence/omap.ts uses omapTag.addItem() to perform a linear duplicate-key scan on every insertion, causing O(n^2) CPU consumption when yaml.load() parses a crafted ordered-map document. This issue is fixed in version 5.2.1.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-08 15:50 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/nodeca/js-yaml/security/adviso… | x_refsource_CONFIRM |
| https://github.com/nodeca/js-yaml/commit/39f3211a… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/releases/tag/5.2.1 | x_refsource_MISC |
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CVE-2026-59869 (GCVE-0-2026-59869)
Vulnerability from cvelistv5 – Published: 2026-07-08 15:15 – Updated: 2026-07-09 15:14
VLAI
EPSS
VEX
Title
js-yaml: YAML merge-key chains can force quadratic CPU consumption
Summary
js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in versions 3.15.0 and 4.3.0.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-09 15:14 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/nodeca/js-yaml/security/adviso… | x_refsource_CONFIRM |
| https://github.com/nodeca/js-yaml/commit/24f13e79… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/commit/59423c6f… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/releases/tag/3.15.0 | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/releases/tag/4.3.0 | x_refsource_MISC |
Impacted products
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CVE-2026-59868 (GCVE-0-2026-59868)
Vulnerability from cvelistv5 – Published: 2026-07-08 15:18 – Updated: 2026-07-09 13:42
VLAI
EPSS
VEX
Title
js-yaml: YAML merge-key chains can force quadratic CPU consumption
Summary
js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in version 5.2.0.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-09 13:41 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/nodeca/js-yaml/security/adviso… | x_refsource_CONFIRM |
| https://github.com/nodeca/js-yaml/commit/3105455b… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/releases/tag/5.2.0 | x_refsource_MISC |
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CVE-2026-59094 (GCVE-0-2026-59094)
Vulnerability from cvelistv5 – Published: 2026-07-02 19:40 – Updated: 2026-07-14 22:03 X_Open Source
VLAI
EPSS
VEX
Title
Pathway - Unauthenticated Denial of Service via Exponential Glob Pattern Matching in Document Store
Summary
Pathway through 0.31.1, fixed in commit d09722e, document store applies a caller-supplied glob pattern to indexed document paths using a hand-written recursive matcher that branches two ways on each ** token without memoization, giving exponential worst-case complexity. The filepath_globpattern value is taken from the body of the unauthenticated HTTP endpoints /v1/retrieve, /v1/inputs and /v2/answer and compiled into a filter evaluated once per indexed document, with no length or **-count limit. A remote unauthenticated attacker can submit a short pattern containing many ** tokens to consume CPU for tens of seconds per request, and a small number of requests denies service.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-06 16:19 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/pathwaycom/pathway/issues/241 | technical-descriptionexploit |
| https://github.com/pathwaycom/pathway/pull/250 | issue-tracking |
| https://github.com/pathwaycom/pathway/commit/d097… | patch |
| https://www.vulncheck.com/advisories/pathway-unau… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| pathwaycom | pathway |
Affected:
0 , ≤ 0.31.1
(semver)
Unaffected: d09722eef03fd94bba701836eb4c7fbfa3d3b88e (git) cpe:2.3:a:pathwaycom:pathway:*:*:*:*:*:*:*:* |
Date Public
2026-06-12 00:00
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CVE-2026-58436 (GCVE-0-2026-58436)
Vulnerability from cvelistv5 – Published: 2026-08-13 16:44 – Updated: 2026-08-14 17:14
VLAI
EPSS
VEX
Title
ParseAcceptLanguage quadratic-time DoS via Locale middleware on unauthenticated requests
Summary
ParseAcceptLanguage quadratic-time DoS via Locale middleware on unauthenticated requests
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-14 17:14 UTC
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/go-gitea/gitea/security/adviso… | vendor-advisory |
| https://github.com/go-gitea/gitea/releases/tag/v1.27.0 | release-notes |
| https://blog.gitea.com/gitea-1.27.0-is-released/ | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Gitea | Gitea Open Source Git Server |
Affected:
0 , ≤ 1.26.4
(semver)
|
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CVE-2026-58226 (GCVE-0-2026-58226)
Vulnerability from cvelistv5 – Published: 2026-07-06 09:03 – Updated: 2026-07-06 14:04
VLAI
EPSS
VEX
Title
Unauthenticated denial-of-service via unbounded HPACK integer decoding in hpax
Summary
Inefficient Algorithmic Complexity vulnerability in elixir-mint hpax allows unauthenticated denial-of-service via unbounded HPACK integer decoding.
hpax decodes HPACK variable-length integers with no upper bound on the decoded value or the number of continuation octets. 'Elixir.HPAX.Types':decode_remaining_integer/3 accumulates the integer as int + (value <<< m), shifting by 7 more bits for each continuation octet and stopping only on a terminating octet or truncated input, never because the integer grew too large. Because BEAM integers are arbitrary precision, a run of N continuation octets builds an O(N)-bit bignum and re-adds into an ever-larger bignum on each step, so the total decoding cost is superlinear (about O(N^2)). An unauthenticated attacker who can send an HTTP/2 header block to a server using this decoder (reached through the 'Elixir.HPAX':decode/2 entry point) can supply a small header block that forces a large, attacker-controlled amount of CPU (and transient memory), a denial-of-service amplification.
This issue affects hpax from 0.1.1 before 1.0.4.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-06 12:49 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/elixir-mint/hpax/security/advi… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-58226.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-58226 | related |
| https://github.com/elixir-mint/hpax/commit/1ba4bb… | patch |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| elixir-mint | hpax |
Affected:
0.1.1 , < 1.0.4
(semver)
cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:* |
|
| elixir-mint | hpax |
Affected:
56db437a7e2c515e3bdd770ac7947b02cd2390d0 , < 1ba4bb2dc91e80089cf89c73970ac3ded76f17eb
(git)
cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:* |
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No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.