CVE-2026-9358
MEDIUMpostcss AST Serialization container.js toString recursion
Title source: cnaDescription
A vulnerability was determined in postcss up to 7.1.1. Affected is the function toString of the file src/selectors/container.js of the component AST Serialization. Executing a manipulation can lead to uncontrolled recursion. It is possible to launch the attack remotely. The exploit has been publicly disclosed and may be utilized. The vendor explains, that according to his definition "DoS on server-side on user-generated CSS is low risk for us (since most users compile own CSS with PostCSS)."
References (4)
Core 4
Core References
Vdb Entry, Technical Description vdb-entry
technical-description
VDB-365321 | postcss AST Serialization container.js toString recursion
https://vuldb.com/vuln/365321
Signature, Permissions Required signature
permissions-required
VDB-365321 | CTI Indicators (IOB, IOC, TTP, IOA)
https://vuldb.com/vuln/365321/cti
Third Party Advisory third-party-advisory
Submit #813080 | postcss-selector-parser postcss <= 7.1.1 CWE-674: Uncontrolled Recursion
https://vuldb.com/submit/813080
Exploit exploit
https://gist.github.com/bx33661/581e3a38134601c04e19b4dfc9b459b9
Scores
CVSS v3
4.3
EPSS
0.0004
EPSS Percentile
11.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-404
CWE-674
Status
published
Products (2)
None/postcss
7.1.0
None/postcss
7.1.1
Published
May 24, 2026
Tracked Since
May 24, 2026