> CVE-2026-45623 [HIGH]

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PUBLISHED
2026-07-27 18:16
MODIFIED
2026-07-27 18:16
CVSS_SCORE V3
7.5
EPSS (Prob. Exploit)
0.61%
Top 51.5%
DATA SOURCES:
NVD đź”— 2026-07-27 RED HAT đź”— 2026-08-09 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-10-25 GITHUB đź”— 2026-10-29 OSV đź”— 2026-08-03 MSRC đź”— 2026-08-08

> DESCRIPTION

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.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EXPLOITABILITY
3.9
IMPACT
3.6

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
High (H)
Divulgation totale d'informations
I (Impact Intégrité)
Integrity Impact
None (N)
Aucune modification de données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
High
Divulgation totale d'informations
Intégrité
None
Aucune modification de données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-22 CWE-200

> CWE DETAILED DESCRIPTIONS

CWE-22: Improper Limitation of a Pathname to a Restricted Directory - The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. | CWE-200: Exposure of Sensitive Information to an Unauthorized Actor - The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

> RED HAT SECURITY ADVISORIES

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Kiali 2.27.3 for Red Hat OpenShift Service Mesh 3.4 is now available. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CV...
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Red Hat Security Advisory: Kiali 2.11.16 for Red Hat OpenShift Service Mesh 3.1
Kiali 2.11.16 for Red Hat OpenShift Service Mesh 3.1 is now available. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (C...
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Red Hat multicluster engine for Kubernetes v2.9 general availability release images, which provide security fixes, bug fixes, and updated container images. Red Hat Product Security has rated this upd...
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Red Hat multicluster engine for Kubernetes v2.8 general availability release images, which provide security fixes, bug fixes, and updated container images. Red Hat Product Security has rated this upd...
Red Hat Security Advisory: Kiali 2.4.22 for Red Hat OpenShift Service Mesh 3.0
Kiali 2.4.22 for Red Hat OpenShift Service Mesh 3.0 is now available. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CV...
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Red Hat Advanced Cluster Management for Kubernetes v2.13 general availability release images, which provide security fixes, bug fixes, and updated container images. Red Hat Product Security has rated...
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A new satellite/iop-advisor-frontend-rhel9 container image is now generally available in the Red Hat container registry.
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> RED HAT SEVERITY ASSESSMENT

THREAT SEVERITY
Moderate

> GITHUB SECURITY ADVISORY

GHSA-6g55-p6wh-862q HIGH

PostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS comments

AFFECTED PACKAGES:
NPM / postcss
<= 8.5.11
Fixed in: 8.5.12

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

PostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS comments

AFFECTED PACKAGES:
Unknown / Unknown
267 versions affected
ALIASES:
GHSA-6g55-p6wh-862q

> HISTORIQUE DES MODIFICATIONS

Première apparition
27/07/2026 18:16
Source: NVD
đź“Š ENRICHISSEMENT 01/11/2026 06:59
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') - The product uses external input to construct a pathname that is intended to identify a file or directory that i...
Nouvelle valeur:
CWE-22: Improper Limitation of a Pathname to a Restricted Directory - The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneat...
đź“Š ENRICHISSEMENT 09/08/2026 05:02
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": "Moderate" }
Nouvelle valeur:
{ "threat_severity": "Moderate", "severity_scale": null }
đź“Š ENRICHISSEMENT 02/08/2026 05:02
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
N/A
Nouvelle valeur:
{ "threat_severity": "Moderate", "severity_scale": null }
đź“Š ENRICHISSEMENT 02/08/2026 05:02
REDHAT
Champ modifié: Red Hat
Ancienne valeur:
Non
Nouvelle valeur:
Oui
đź“Š ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') - The product uses external input to construct a pathname that is intended to identify a file or directory that i...
Total des modifications: 5 Dernière mise à jour: 4 days ago

> REFERENCES

https://github.com/postcss/postcss/security/advisories/GHSA-6g55-p6wh-862q
https://github.com/postcss/postcss/security/advisories/GHSA-6g55-p6wh-862q
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