Common Weakness Enumeration

CWE-180

Allowed

Incorrect Behavior Order: Validate Before Canonicalize

Abstraction: Variant · Status: Draft

The product validates input before it is canonicalized, which prevents the product from detecting data that becomes invalid after the canonicalization step.

51 vulnerabilities reference this CWE, most recent first.

CVE-2026-48721 (GCVE-0-2026-48721)

Vulnerability from cvelistv5 – Published: 2026-06-24 17:31 – Updated: 2026-06-25 17:06
VLAI
Title
Warp: Env-var prefixes can lead to denylisted command autoexecution
Summary
Warp is an agentic development environment. From 0.2025.10.08.08.12.stable_00 until 0.2026.05.06.15.42.stable_01, Warp contains a command execution permission-check bypass in the default unsandboxed CLI agent profile. The CLI profile is non-interactive and relies on a command denylist as a safety boundary for commands that should require confirmation. Because command strings were checked before canonicalizing leading environment-variable assignments, an attacker who can influence the agent's command output may cause denylisted commands to be treated as non-denylisted. This vulnerability is fixed in 0.2026.05.06.15.42.stable_01.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-25 17:06 UTC
CWE
  • CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
  • CWE-693 - Protection Mechanism Failure
References
Impacted products
Vendor Product Version
warpdotdev warp Affected: >= 0.2025.10.08.08.12.stable_00, < 0.2026.05.13.09.15.stable_01
Create a notification for this product.
Show details on NVD website

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CVE-2026-45022 (GCVE-0-2026-45022)

Vulnerability from cvelistv5 – Published: 2026-05-27 14:54 – Updated: 2026-05-27 15:43
VLAI
Title
go-git: Improper parsing of specially crafted objects may lead to inconsistent interpretation compared to upstream Git
Summary
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SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-27 15:42 UTC
CWE
  • CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
  • CWE-345 - Insufficient Verification of Data Authenticity
References
Impacted products
Vendor Product Version
go-git go-git Affected: < 5.19.0
Affected: >= 6.0.0-alpha.1, < 6.0.0-alpha.3
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.
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
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

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CVE-2026-39409 (GCVE-0-2026-39409)

Vulnerability from cvelistv5 – Published: 2026-04-08 14:43 – Updated: 2026-04-08 16:13
VLAI
Title
Hono has incorrect IP matching in ipRestriction() for IPv4-mapped IPv6 addresses
Summary
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, ipRestriction() does not canonicalize IPv4-mapped IPv6 client addresses (e.g. ::ffff:127.0.0.1) before applying IPv4 allow or deny rules. In environments such as Node.js dual-stack, this can cause IPv4 rules to fail to match, leading to unintended authorization behavior. This vulnerability is fixed in 4.12.12.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-08 16:08 UTC
CWE
  • CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
Impacted products
Vendor Product Version
honojs hono Affected: < 4.12.12
Create a notification for this product.
Show details on NVD website

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CVE-2026-39364 (GCVE-0-2026-39364)

Vulnerability from cvelistv5 – Published: 2026-04-07 19:12 – Updated: 2026-08-17 12:05
VLAI
Title
Vite has a `server.fs.deny` bypass with queries
Summary
Vite is a frontend tooling framework for JavaScript. From 7.1.0 to before 7.3.2 and 8.0.5, on the Vite dev server, files that should be blocked by server.fs.deny (e.g., .env, *.crt) can be retrieved with HTTP 200 responses when query parameters such as ?raw, ?import&raw, or ?import&url&inline are appended. This vulnerability is fixed in 7.3.2 and 8.0.5.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-07 20:01 UTC
CWE
  • CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
  • CWE-284 - Improper Access Control
  • CWE-472 - External Control of Assumed-Immutable Web Parameter
Show details on NVD website

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CVE-2026-34786 (GCVE-0-2026-34786)

Vulnerability from cvelistv5 – Published: 2026-04-02 16:44 – Updated: 2026-04-03 17:38
VLAI
Title
Rack: Rack::Static header_rules bypass via URL-encoded paths
Summary
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Static#applicable_rules evaluates several header_rules types against the raw URL-encoded PATH_INFO, while the underlying file-serving path is decoded before the file is served. As a result, a request for a URL-encoded variant of a static path can serve the same file without the headers that header_rules were intended to apply. In deployments that rely on Rack::Static to attach security-relevant response headers to static content, this can allow an attacker to bypass those headers by requesting an encoded form of the path. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-03 17:37 UTC
CWE
  • CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
References
Impacted products
Vendor Product Version
rack rack Affected: < 2.2.23
Affected: >= 3.0.0.beta1, < 3.1.21
Affected: >= 3.2.0, < 3.2.6
Create a notification for this product.
Show details on NVD website

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CVE-2026-34475 (GCVE-0-2026-34475)

Vulnerability from cvelistv5 – Published: 2026-03-27 19:40 – Updated: 2026-03-27 20:01
VLAI
Summary
Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle URLs with a path of / for HTTP/1.1, potentially leading to cache poisoning or authentication bypass.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-27 20:00 UTC
CWE
  • CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
References
Impacted products
Vendor Product Version
varnish-software Varnish Cache Affected: 0 , < 6.0.17 LTS (custom)
Affected: 7.0.0 , < 8.0.1 (custom)
    cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:*:*:*:*
    cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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CVE-2026-27590 (GCVE-0-2026-27590)

Vulnerability from cvelistv5 – Published: 2026-02-24 16:33 – Updated: 2026-02-27 20:52
VLAI
Title
Caddy: Unicode case-folding length expansion causes incorrect split_path index (SCRIPT_NAME/PATH_INFO confusion) in FastCGI transport
Summary
Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's FastCGI path splitting logic computes the split index on a lowercased copy of the request path and then uses that byte index to slice the original path. This is unsafe for Unicode because `strings.ToLower()` can change UTF-8 byte length for some characters. As a result, Caddy can derive an incorrect `SCRIPT_NAME`/`SCRIPT_FILENAME` and `PATH_INFO`, potentially causing a request that contains `.php` to execute a different on-disk file than intended (path confusion). In setups where an attacker can control file contents (e.g., upload features), this can lead to unintended PHP execution of non-.php files (potential RCE depending on deployment). Version 2.11.1 fixes the issue.
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-27 20:51 UTC
CWE
  • CWE-20 - Improper Input Validation
  • CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
Impacted products
Vendor Product Version
caddyserver caddy Affected: < 2.11.1
Create a notification for this product.
Show details on NVD website

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CVE-2026-24895 (GCVE-0-2026-24895)

Vulnerability from cvelistv5 – Published: 2026-02-12 19:16 – Updated: 2026-02-12 20:04
VLAI
Title
FrankenPHP affected by Path Confusion via Unicode casing in CGI path splitting allows execution of arbitrary files
Summary
FrankenPHP is a modern application server for PHP. Prior to 1.11.2, FrankenPHP’s CGI path splitting logic improperly handles Unicode characters during case conversion. The logic computes the split index (for finding .php) on a lowercased copy of the request path but applies that byte index to the original path. Because strings.ToLower() in Go can increase the byte length of certain UTF-8 characters (e.g., Ⱥ expands when lowercased), the computed index may not align with the correct position in the original string. This results in an incorrect SCRIPT_NAME and SCRIPT_FILENAME, potentially causing FrankenPHP to execute a file other than the one intended by the URI. This vulnerability is fixed in 1.11.2.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-12 20:03 UTC
CWE
  • CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
Impacted products
Vendor Product Version
php frankenphp Affected: < 1.11.2
Create a notification for this product.
Show details on NVD website

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CVE-2026-15704 (GCVE-0-2026-15704)

Vulnerability from cvelistv5 – Published: 2026-07-24 07:41 – Updated: 2026-07-24 12:30
VLAI
Title
CWE-863: ABAC authorization bypass via trailing slash route normalization in Eclipse BaSyx Go Components
Summary
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SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-24 12:30 UTC
Impacted products
Show details on NVD website

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  "cveMetadata": {
    "assignerOrgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
    "assignerShortName": "eclipse",
    "cveId": "CVE-2026-15704",
    "datePublished": "2026-07-24T07:41:42.653Z",
    "dateReserved": "2026-07-14T07:09:49.542Z",
    "dateUpdated": "2026-07-24T12:30:35.564Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Mitigation MIT-20
Implementation

Strategy: Input Validation

Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.

CAPEC-267: Leverage Alternate Encoding

An adversary leverages the possibility to encode potentially harmful input or content used by applications such that the applications are ineffective at validating this encoding standard.

CAPEC-3: Using Leading 'Ghost' Character Sequences to Bypass Input Filters

Some APIs will strip certain leading characters from a string of parameters. An adversary can intentionally introduce leading "ghost" characters (extra characters that don't affect the validity of the request at the API layer) that enable the input to pass the filters and therefore process the adversary's input. This occurs when the targeted API will accept input data in several syntactic forms and interpret it in the equivalent semantic way, while the filter does not take into account the full spectrum of the syntactic forms acceptable to the targeted API.

CAPEC-71: Using Unicode Encoding to Bypass Validation Logic

An attacker may provide a Unicode string to a system component that is not Unicode aware and use that to circumvent the filter or cause the classifying mechanism to fail to properly understanding the request. That may allow the attacker to slip malicious data past the content filter and/or possibly cause the application to route the request incorrectly.

CAPEC-78: Using Escaped Slashes in Alternate Encoding

This attack targets the use of the backslash in alternate encoding. An adversary can provide a backslash as a leading character and causes a parser to believe that the next character is special. This is called an escape. By using that trick, the adversary tries to exploit alternate ways to encode the same character which leads to filter problems and opens avenues to attack.

CAPEC-79: Using Slashes in Alternate Encoding

This attack targets the encoding of the Slash characters. An adversary would try to exploit common filtering problems related to the use of the slashes characters to gain access to resources on the target host. Directory-driven systems, such as file systems and databases, typically use the slash character to indicate traversal between directories or other container components. For murky historical reasons, PCs (and, as a result, Microsoft OSs) choose to use a backslash, whereas the UNIX world typically makes use of the forward slash. The schizophrenic result is that many MS-based systems are required to understand both forms of the slash. This gives the adversary many opportunities to discover and abuse a number of common filtering problems. The goal of this pattern is to discover server software that only applies filters to one version, but not the other.

CAPEC-80: Using UTF-8 Encoding to Bypass Validation Logic

This attack is a specific variation on leveraging alternate encodings to bypass validation logic. This attack leverages the possibility to encode potentially harmful input in UTF-8 and submit it to applications not expecting or effective at validating this encoding standard making input filtering difficult. UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. Legal UTF-8 characters are one to four bytes long. However, early version of the UTF-8 specification got some entries wrong (in some cases it permitted overlong characters). UTF-8 encoders are supposed to use the "shortest possible" encoding, but naive decoders may accept encodings that are longer than necessary. According to the RFC 3629, a particularly subtle form of this attack can be carried out against a parser which performs security-critical validity checks against the UTF-8 encoded form of its input, but interprets certain illegal octet sequences as characters.