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5 vulnerabilities by postcss
CVE-2026-104844 (GCVE-0-2026-104844)
Vulnerability from cvelistv5 – Published: 2026-10-02 15:43 – Updated: 2026-10-02 16:16
VLAI
EPSS
VEX
Title
PostCSS: Quadratic complexity in flat selector parsing allows CPU exhaustion
Summary
PostCSS Selector Parser is a CSS selector parser that integrates with PostCSS but does not require it. Prior to 7.1.6, src/parser.js splitWord() can receive a flat selector as one word token carrying many class or ID indexes because period and hash characters are not tokenizer word delimiters. The uniqs() deduplication and per-index class and ID membership checks repeatedly scan the class and ID index arrays, while a separate Sass-interpolation filtering pass also performs repeated linear scanning. Together, these passes make parsing quadratic in the number of indexes and allow a crafted selector to occupy a synchronous parser thread. The maxNestingDepth guard does not mitigate the issue because the hostile selector can have zero nesting depth. Only consumers that synchronously parse untrusted selectors in an exposed request path are affected; ordinary build-time parsing of trusted sources is not affected. This issue is fixed in version 7.1.6.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 16:16 UTC
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/postcss/postcss-selector-parse… | x_refsource_CONFIRM |
| https://github.com/postcss/postcss-selector-parse… | x_refsource_MISC |
| https://github.com/postcss/postcss-selector-parse… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| postcss | postcss-selector-parser |
Affected:
< 7.1.6
|
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CVE-2026-73646 (GCVE-0-2026-73646)
Vulnerability from cvelistv5 – Published: 2026-08-17 15:35 – Updated: 2026-08-17 16:36
VLAI
EPSS
VEX
Title
PostCSS: Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File Disclosure
Summary
PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 16:35 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/postcss/postcss/security/advis… | x_refsource_CONFIRM |
| https://github.com/postcss/postcss/commit/95663d3… | x_refsource_MISC |
| https://github.com/postcss/postcss/releases/tag/8.5.18 | x_refsource_MISC |
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CVE-2026-69153 (GCVE-0-2026-69153)
Vulnerability from cvelistv5 – Published: 2026-08-03 16:56 – Updated: 2026-08-03 18:28
VLAI
EPSS
VEX
Title
PostCSS: incomplete fix of CVE-2026-45623 — attacker-controlled sourceMappingURL reads arbitrary .map files when `from` is unset
Summary
PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.19, if from is unset, an attacker can cause PreviousMap.loadFile() to read an unintended source-map file by supplying an absolute or directory-traversal sourceMappingURL. The resulting map’s sources and sourcesContent may then be exposed to the application. This issue is fixed in version 8.5.19.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-03 18:28 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/postcss/postcss/security/advis… | x_refsource_CONFIRM |
| https://github.com/postcss/postcss/commit/7beca13… | x_refsource_MISC |
| https://github.com/postcss/postcss/releases/tag/8.5.19 | x_refsource_MISC |
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CVE-2026-45623 (GCVE-0-2026-45623)
Vulnerability from cvelistv5 – Published: 2026-07-27 17:23 – Updated: 2026-07-27 17:44
VLAI
EPSS
VEX
Title
PostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS comments
Summary
PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. In versions 8.5.11 and prior, the PreviousMap parses the /*# sourceMappingURL=PATH */ comment from any CSS string passed to process() and dereferences PATH against the local filesystem with no scheme, allowlist, or traversal check. An attacker who controls the CSS input can cause the host process to read any file readable by Node and leak the first ~10 bytes of its content through the resulting JSON.parse SyntaxError message. The bug also yields a precise file-existence oracle and a controllable-read primitive that may be combined with large-file targets for DoS. The behaviour is triggered with PostCSS's default options — no from, no map, no plugins required — and is therefore reachable from any pipeline that runs untrusted CSS through PostCSS (CMS themes, user-uploaded styles, browser-extension/userstyle processors, build pipelines for third-party packages, blog comment renderers, etc.). This issue has been fixed in version 8.5.12.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 17:44 UTC
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/postcss/postcss/security/advis… | x_refsource_CONFIRM |
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CVE-2026-41305 (GCVE-0-2026-41305)
Vulnerability from cvelistv5 – Published: 2026-04-24 02:27 – Updated: 2026-04-24 16:23
VLAI
EPSS
VEX
Title
PostCSS has XSS via Unescaped </style> in its CSS Stringify Output
Summary
PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Versions prior to 8.5.10 do not escape `</style>` sequences when stringifying CSS ASTs. When user-submitted CSS is parsed and re-stringified for embedding in HTML `<style>` tags, `</style>` in CSS values breaks out of the style context, enabling XSS. Version 8.5.10 fixes the issue.
Severity
6.1 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-24 16:22 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/postcss/postcss/security/advis… | x_refsource_CONFIRM |
| https://github.com/postcss/postcss/releases/tag/8.5.10 | x_refsource_MISC |
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"title": "PostCSS has XSS via Unescaped \u003c/style\u003e in its CSS Stringify Output"
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