CWE-1289

Improper Validation of Unsafe Equivalence in Input

The product receives an input value that is used as a resource identifier or other type of reference, but it does not validate or incorrectly validates that the input is equivalent to a potentially-unsafe value.

CVE-2026-34080 (GCVE-0-2026-34080)

Vulnerability from cvelistv5 – Published: 2026-04-07 20:57 – Updated: 2026-04-21 12:21
VLAI
Title
xdg-dbus-proxy has an eavesdrop filter bypass allowing message interception
Summary
xdg-dbus-proxy is a filtering proxy for D-Bus connections. Prior to 0.1.7, a policy parser vulnerability allows bypassing eavesdrop restrictions. The proxy checks for eavesdrop=true in policy rules but fails to handle eavesdrop ='true' (with a space before the equals sign) and similar cases. Clients can intercept D-Bus messages they should not have access to. This vulnerability is fixed in 0.1.7.
Severity
6.8 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
References
Impacted products
Vendor Product Version
flatpak xdg-dbus-proxy Affected: < 0.1.7
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CVE-2026-35039 (GCVE-0-2026-35039)

Vulnerability from cvelistv5 – Published: 2026-04-06 16:59 – Updated: 2026-05-13 15:12
VLAI
Title
fast-jwt Affected by Cache Confusion via cacheKeyBuilder Collisions Can Return Claims From a Different Token (Identity/Authorization Mixup)
Summary
fast-jwt provides fast JSON Web Token (JWT) implementation. From 0.0.1 to before 6.2.0, setting up a custom cacheKeyBuilder method which does not properly create unique keys for different tokens can lead to cache collisions. This could cause tokens to be mis-identified during the verification process leading to valid tokens returning claims from different valid tokens and users being mis-identified as other users based on the wrong token. Version 6.2.0 contains a patch.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-345 - Insufficient Verification of Data Authenticity
  • CWE-706 - Use of Incorrectly-Resolved Name or Reference
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
References
Impacted products
Vendor Product Version
nearform fast-jwt Affected: >= 0.0.1, < 6.2.0
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CVE-2026-3563 (GCVE-0-2026-3563)

Vulnerability from cvelistv5 – Published: 2026-03-17 19:15 – Updated: 2026-03-17 20:04
VLAI
Summary
Improper input validation in the apps and endpoints configuration in PowerShell Universal before 2026.1.4 allows an authenticated user with permissions to create or modify Apps or Endpoints to override existing application or system routes, resulting in unintended request routing and denial of service via a conflicting URL path.
Severity
5.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:L
CWE
  • CWE-1289 - Improper validation of unsafe equivalence in input
Assigner
References
Impacted products
Vendor Product Version
Devolutions PowerShell Universal Affected: 2026.1.0 , < 2026.1.4 (custom)
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CVE-2026-39972 (GCVE-0-2026-39972)

Vulnerability from cvelistv5 – Published: 2026-04-09 16:42 – Updated: 2026-04-09 18:59
VLAI
Title
Mercure has a Topic Selector Cache Key Collision
Summary
Mercure is a protocol for pushing data updates to web browsers and other HTTP clients in a battery-efficient way. Prior to 0.22.0, a cache key collision vulnerability in TopicSelectorStore allows an attacker to poison the match result cache, potentially causing private updates to be delivered to unauthorized subscribers or blocking delivery to authorized ones. The cache key was constructed by concatenating the topic selector and topic with an underscore separator. Because both topic selectors and topics can contain underscores, two distinct pairs can produce the same key. An attacker who can subscribe to the hub or publish updates with crafted topic names can exploit this to bypass authorization checks on private updates. This vulnerability is fixed in 0.22.0.
Severity
7.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N
CWE
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
References
Impacted products
Vendor Product Version
dunglas mercure Affected: < 0.22.0
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Show details on NVD website
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CVE-2026-41213 (GCVE-0-2026-41213)

Vulnerability from cvelistv5 – Published: 2026-04-23 18:33 – Updated: 2026-04-25 01:23
VLAI
Title
@node-oauth/oauth2-server: PKCE code_verifier ABNF not enforced in token exchange allows brute-force redemption of intercepted authorization codes
Summary
@node-oauth/oauth2-server is a module for implementing an OAuth2 server in Node.js. The token exchange path accepts RFC7636-invalid code_verifier values (including one-character strings) for S256 PKCE flows. Because short/weak verifiers are accepted and failed verifier attempts do not consume the authorization code, an attacker who intercepts an authorization code can brute-force code_verifier guesses online until token issuance succeeds.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-307 - Improper Restriction of Excessive Authentication Attempts
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
References
Impacted products
Show details on NVD website
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CVE-2026-41239 (GCVE-0-2026-41239)

Vulnerability from cvelistv5 – Published: 2026-04-23 14:47 – Updated: 2026-04-25 01:21
VLAI
Title
DOMPurify has a SAFE_FOR_TEMPLATES bypass in RETURN_DOM mode
Summary
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Starting in version 1.0.10 and prior to version 3.4.0, `SAFE_FOR_TEMPLATES` strips `{{...}}` expressions from untrusted HTML. This works in string mode but not with `RETURN_DOM` or `RETURN_DOM_FRAGMENT`, allowing XSS via template-evaluating frameworks like Vue 2. Version 3.4.0 patches the issue.
Severity
6.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
References
Impacted products
Vendor Product Version
cure53 DOMPurify Affected: >= 1.0.10, < 3.4.0
Create a notification for this product.
Show details on NVD website
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CVE-2026-45190 (GCVE-0-2026-45190)

Vulnerability from cvelistv5 – Published: 2026-05-10 20:15 – Updated: 2026-05-12 14:31
VLAI
Title
Net::CIDR::Lite versions before 0.24 for Perl does not properly validate IP address and CIDR mask inputs, which may allow IP ACL bypass
Summary
Net::CIDR::Lite versions before 0.24 for Perl does not properly validate IP address and CIDR mask inputs, which may allow IP ACL bypass. Inputs containing a trailing newline or non-ASCII digit characters pass the validators but are then re-encoded by the parser to a different address than the input string spelled. find() and bin_find() can match or miss addresses as a result. Example: my $cidr = Net::CIDR::Lite->new(); $cidr->add("::1\n/128"); $cidr->find("::1a"); # incorrectly returns true See also CVE-2026-45191.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
CWE
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
References
Impacted products
Vendor Product Version
STIGTSP Net::CIDR::Lite Affected: 0 , < 0.24 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-45191 (GCVE-0-2026-45191)

Vulnerability from cvelistv5 – Published: 2026-05-10 20:15 – Updated: 2026-05-11 16:37
VLAI
Title
Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass
Summary
Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass. Mask forms like "/00" and "/01" pass validation and parse to the same prefix as their unpadded value. See also CVE-2026-45190.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
CWE
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
References
Impacted products
Vendor Product Version
STIGTSP Net::CIDR::Lite Affected: 0 , < 0.24 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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Mitigation ID: MIT-5

Phase: Implementation

Strategy: Input Validation

Description:

  • Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
  • When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
  • Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.

No CAPEC attack patterns related to this CWE.

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