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CVE-2026-9358

postcss-selector-parser AST Serialization container.js toString recursion

CVSS 4.0 5.3 MEDIUMCVSS 3.1 4.3 MEDIUMCVSS 3.0 4.3 MEDIUMCVSS 2.0 5.0 Check source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-9358

Published

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 recursion. It is possible to launch the attack remotely. The exploit has been publicly disclosed and may be utilized. Upgrading to version 6.1.3 and 7.1.3 is able to address this issue. This patch is called 5bc698cef66f8abd12610dc623e5d67cbc0f869d. It is suggested to upgrade the affected component. 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)." The commits were backported to 6.x branch, which was the most downloaded version.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-9358

Published

postcss-selector-parser

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "n/a",
                    "product": "postcss-selector-parser",
                    "versions": [
                        {
                            "version": "6.1.0",
                            "status": "affected"
                        },
                        {
                            "version": "6.1.1",
                            "status": "affected"
                        },
                        {
                            "version": "6.1.2",
                            "status": "affected"
                        },
                        {
                            "version": "7.1.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.1.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.1.2",
                            "status": "affected"
                        },
                        {
                            "version": "6.1.3",
                            "status": "unaffected"
                        },
                        {
                            "version": "7.1.3",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:2.3:a:postcss-selector-parser:postcss-selector-parser:*:*:*:*:*:*:*:*"
                    ],
                    "modules": [
                        "AST Serialization"
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON