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MEDIUM

CVE-2026-69153

CVSS v3

5.3

MEDIUM

EPSS Score

0.5 %

exploit probability, as of 2026-10-17

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • postcssnpmall versions · fixed in 8.5.23

Vendor advisories

  • CVE-2026-69153 Red Hat Product Security192 products fixed · 136 known affected

    postcss: PostCSS: Information disclosure via crafted sourceMappingURL

    cryostat-openshift-console-plugin-npm as a component of Cryostat 4 · grafana-infinity-datasource-npm as a component of Cryostat 4 · postcss as a component of Cryostat 4

  • RHSA-2026:83598 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: RHTAS 1.4.4 - Red Hat Trusted Artifact Signer Release

  • RHSA-2026:74511 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Quay 3.17.5

  • RHSA-2026:70587 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.17.58 bug fix and security update

  • RHSA-2026:67936 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.16.71 bug fix and security update

  • RHSA-2026:71179 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Container Release Update

41 more advisories

Full record on NVD

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. 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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Published
2026-08-03
Last Modified
2026-08-05

Frequently asked questions

What is CVE-2026-69153?

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.

Is CVE-2026-69153 actively exploited?

Active exploitation of CVE-2026-69153 has not been confirmed. Its EPSS score was 0.5% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-69153?

CVE-2026-69153 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

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