HIGH

CVE-2026-73646

CVSS v3

7.5

HIGH

EPSS Score

0.5 %

exploit probability, as of 2026-10-17

CISA KEV

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 8.5.18

Vendor advisories

CVE-2026-73646 Red Hat Product Security30 products fixed · 36 known affected
postcss: PostCSS: Information disclosure via path traversal in source map auto-loading
workload-availability/node-healthcheck-must-gather-rhel9 as a component of Node HealthCheck Operator · workload-availability/node-healthcheck-operator-bundle as a component of Node HealthCheck Operator · workload-availability/node-healthcheck-rhel9-operator as a component of Node HealthCheck Operator
RHSA-2026:83598 Red Hat Product Security1 product fixed
Red Hat Security Advisory: RHTAS 1.4.4 - Red Hat Trusted Artifact Signer Release
RHSA-2026:70829 Red Hat Product Security1 product fixed
Red Hat Security Advisory: RHTAS 1.3.8 - Red Hat Trusted Artifact Signer Release
RHSA-2026:68765 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Technical preview of the satellite/iop-vulnerability-frontend-rhel9 container image
RHSA-2026:68756 Red Hat Product Security1 product fixed
Red Hat Security Advisory: General availability of the satellite/iop-host-inventory-frontend-rhel9 container image
RHSA-2026:68755 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Technical preview of the satellite/iop-vulnerability-frontend-rhel9 container image

9 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 8.5.18, 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.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published: 2026-08-17
Last Modified: 2026-08-17

Frequently asked questions

What is CVE-2026-73646?

Is CVE-2026-73646 actively exploited?

Active exploitation of CVE-2026-73646 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-2026-73646?

CVE-2026-73646 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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