Common Weakness Enumeration

CWE-1289

Allowed

Improper Validation of Unsafe Equivalence in Input

Abstraction: Base · Status: Incomplete

API response cwe.mitre.org

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.

43 vulnerabilities reference this CWE, most recent first.

CVE-2026-47729 (GCVE-0-2026-47729)

Vulnerability from cvelistv5 – Published: 2026-07-16 16:13 – Updated: 2026-07-17 18:07
VLAI
Title
Squid: Memory disclosure in FTP gateway
Summary
Squid is a caching proxy for the Web. Prior to 7.6, due to an improper validation of syntactic correctness of input in the FTP gateway (src/clients/FtpGateway.cc), Squid is vulnerable to an out-of-bounds read: when a listing entry date in the TypeA or TypeB directory-listing formats is not followed by a filename, parsing was not restricted to the input buffer, so a trusted client accessing a misbehaving FTP server through Squid's gateway feature could read memory from random unrelated transactions. This issue is fixed in version 7.6.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-16 17:52 UTC
CWE
  • CWE-125 - Out-of-bounds Read
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
squid-cache squid Affected: < 7.6
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Show details on NVD website
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CVE-2026-47674 (GCVE-0-2026-47674)

Vulnerability from cvelistv5 – Published: 2026-05-28 15:29 – Updated: 2026-06-02 18:15
VLAI
Title
Hono: IP Restriction bypasses static deny rules for non-canonical IPv6
Summary
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the ip-restriction middleware (hono/ip-restriction) compares incoming IP addresses against configured deny and allow rules using string equality after partial normalization. Non-canonical IPv6 representations of an address already listed in a static rule — such as compressed forms, explicit-zero forms, or hex-notation IPv4-mapped addresses — do not match the normalized rule entry, causing the rule to be silently skipped. This vulnerability is fixed in 4.12.21.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-02 18:14 UTC
CWE
  • CWE-185 - Incorrect Regular Expression
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
honojs hono Affected: < 4.12.21
Create a notification for this product.
Show details on NVD website
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CVE-2026-46644 (GCVE-0-2026-46644)

Vulnerability from cvelistv5 – Published: 2026-07-14 20:48 – Updated: 2026-07-15 12:52
VLAI
Title
symfony/polyfill-intl-idn accepts xn-- labels whose Punycode payload decodes to ASCII-only: insecure equivalence
Summary
Symfony Polyfill backports PHP features and provides compatibility layers for extensions and functions. From 1.17.1 until 1.38.1, symfony/polyfill-intl-idn accepts xn-- labels whose Punycode payload is empty or decodes to ASCII-only code points because Idn::process() does not enforce the UTS #46 revision 33 requirement that decoded ACE labels contain at least one non-ASCII code point. Originally unequal domain names can be regarded as equal, which can lead to blacklist bypassing, inconsistent URL parsing, and server-side request forgery in applications using the polyfill to canonicalise or compare hostnames. This issue is fixed in version 1.38.1.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 12:52 UTC
CWE
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
symfony polyfill Affected: >= 1.17.1, < 1.38.1
Create a notification for this product.
symfony polyfill-intl-idn Affected: >= 1.17.1, < 1.38.1
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
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-11 16:37 UTC
CWE
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
CPANSec CNA
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-2026-45190 (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
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-12 14:30 UTC
CWE
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
CPANSec CNA
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
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CVE-2026-42462 (GCVE-0-2026-42462)

Vulnerability from cvelistv5 – Published: 2026-06-10 20:22 – Updated: 2026-06-11 13:34
VLAI
Title
Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring
Summary
Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its Linked Data Signature, allowing them to alter a third-party signed activity they have received. Versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3 fix the issue.
Severity
7 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-11 13:31 UTC
CWE
  • CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
  • CWE-347 - Improper Verification of Cryptographic Signature
  • CWE-436 - Interpretation Conflict
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
fedify-dev fedify Affected: >= 2.2.0, < 2.2.3
Affected: >= 2.1.0, < 2.1.14
Affected: >= 2.0.0, < 2.0.18
Affected: >= 1.10.0, < 1.10.10
Affected: < 1.9.11
Create a notification for this product.
Show details on NVD website
To clipboard 

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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
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-25 01:21 UTC
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
GitHub_M CNA
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
To clipboard 

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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
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-25 01:23 UTC
CWE
  • CWE-307 - Improper Restriction of Excessive Authentication Attempts
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
GitHub_M CNA
References
Impacted products
Show details on NVD website
To clipboard 

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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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-09 18:59 UTC
CWE
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
dunglas mercure Affected: < 0.22.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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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
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-07 14:25 UTC
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
GitHub_M CNA
References
Impacted products
Vendor Product Version
nearform fast-jwt Affected: >= 0.0.1, < 6.2.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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Mitigation MIT-5
Implementation

Strategy: Input Validation

  • 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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