What is CVE-2026-9358?

CVE-2026-9358 is a medium-severity vulnerability in Postcss, classified under Improper Resource Shutdown or Release. CVSS score: 4.3/10. Published 2026-05-24.

How severe is CVE-2026-9358?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Postcss

CVE-2026-9358

A vulnerability was determined in postcss-selector-parser up to 6.1.2/7.1.2. Affected is the function toString of the file src/selectors/container.js of the component AST Serialization. Executing a manipulation can lead to uncontrolled rec…

EPSS: 0.003 (24.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.

Affected products

N/a Postcss — versions 7.1.0, 7.1.1
N/a Postcss-selector-parser — versions 6.1.0, 6.1.1, 6.1.2

Weakness classification (CWE)

References

cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (exploit)
cna@vuldb.com (patch)
cna@vuldb.com (patch)
cna@vuldb.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-9358?: CVE-2026-9358 is a medium-severity vulnerability in Postcss, classified under Improper Resource Shutdown or Release. CVSS score: 4.3/10. Published 2026-05-24.
How severe is CVE-2026-9358?: Medium severity. CVSS v3 base score is 4.3 out of 10.