Nixpkgs security tracker

Permalink CVE-2026-69153

6.3 MEDIUM

CVSS version (CVSS): 4.0
Attack Vector (AV): Network (N)
Attack Complexity (AC): Low (L)
Attack Requirement (AT): Present (P)
Privileges Required (PR): None (N)
User Interaction (UI): None (N)
Vulnerable System Impact Confidentiality (VC): Low (L)
Vulnerable System Impact Integrity (VI): None (N)
Vulnerable System Impact Availability (VA): None (N)
Subsequent System Impact Confidentiality (SC): None (N)
Subsequent System Impact Integrity (SI): None (N)
Subsequent System Impact Availability (SA): None (N)
Modified Attack Vector (MAV): Network (N)
Modified Attack Complexity (MAC): Low (L)
Modified Attack Requirement (MAT): Present (P)
Modified Privileges Required (MPR): None (N)
Modified User Interaction (MUI): None (N)
Modified Vulnerable System Impact Confidentiality (MVC): Low (L)
Modified Vulnerable System Impact Integrity (MVI): None (N)
Modified Vulnerable System Impact Availability (MVA): None (N)
Modified Subsequent System Impact Confidentiality (MSC): Negligible (N)
Modified Subsequent System Impact Integrity (MSI): Negligible (N)
Modified Subsequent System Impact Availability (MSA): Negligible (N)
Safety (S): Not Defined (X)
Automatable (AU): Not Defined (X)
Recovery (R): Not Defined (X)
Value Density (V): Not Defined (X)
Vulnerability Response Effort (RE): Not Defined (X)
Provider Urgency (U): Not Defined (X)
Confidentiality Req. (CR): Not Defined (X)
Integrity Req. (IR): Not Defined (X)
Availability Req. (AR): Not Defined (X)
Exploit Maturity (E): Not Defined (X)

updated 1 month, 1 week ago by @LeSuisse Activity log

Created suggestion 1 month, 1 week ago
@LeSuisse accepted 1 month, 1 week ago
@LeSuisse published on GitHub 1 month, 1 week ago

PostCSS: incomplete fix of CVE-2026-45623 — attacker-controlled sourceMappingURL reads arbitrary .map files when `from` is unset

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.

References

https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp exploitx_refsource_CONFIRM
https://github.com/postcss/postcss/commit/7beca139e70f9075c6b19700fcb00dd8033e5da8 x_refsource_MISC
https://github.com/postcss/postcss/releases/tag/8.5.19 x_refsource_MISC

Affected products

postcss

==< 8.5.19

Matching in nixpkgs

pkgs.postcss

Transforming styles with JS plugins

nixos-unstable 8.5.15
- nixpkgs-unstable 8.5.15
- nixos-unstable-small 8.5.15
nixos-26.05 8.5.14
- nixos-26.05-small 8.5.14
- nixpkgs-26.05-darwin 8.5.14

Permalink CVE-2026-41305

6.1 MEDIUM

CVSS version (CVSS): 3.1
Attack Vector (AV): Network (N)
Attack Complexity (AC): Low (L)
Privileges Required (PR): None (N)
User Interaction (UI): Required (R)
Scope (S): Changed (C)
Confidentiality (C): Low (L)
Integrity (I): Low (L)
Availability (A): None (N)
Modified Attack Vector (MAV): Network (N)
Modified Attack Complexity (MAC): Low (L)
Modified Privileges Required (MPR): None (N)
Modified User Interaction (MUI): Required (R)
Modified Confidentiality (MC): Low (L)
Modified Scope (MS): Changed (C)
Modified Integrity (MI): Low (L)
Modified Availability (MA): None (N)

updated 4 months, 3 weeks ago by @LeSuisse Activity log

Created suggestion 4 months, 3 weeks ago
@LeSuisse ignored
2 packages
- nodePackages.postcss
- nodePackages_latest.postcss
4 months, 3 weeks ago
@LeSuisse restored
2 packages
- nodePackages.postcss
- nodePackages_latest.postcss
4 months, 3 weeks ago
@LeSuisse accepted 4 months, 3 weeks ago
@LeSuisse published on GitHub 4 months, 3 weeks ago

PostCSS has XSS via Unescaped </style> in its CSS Stringify Output

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.