{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-126191",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-11-10T20:07:44.957Z",
        "datePublished": "2026-11-12T16:57:01.566Z",
        "dateUpdated": "2026-11-12T16:57:01.566Z"
    },
    "containers": {
        "cna": {
            "title": "Soup Sieve: Exponential ReDoS in selector compilation via \\9-run in CSS_ESCAPES/IDENTIFIER",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-1333",
                            "lang": "en",
                            "description": "CWE-1333: Inefficient Regular Expression Complexity",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "HIGH",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-6655-6qjp-jx7x",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-6655-6qjp-jx7x"
                },
                {
                    "name": "https://github.com/facelessuser/soupsieve/pull/300",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/facelessuser/soupsieve/pull/300"
                },
                {
                    "name": "https://github.com/facelessuser/soupsieve/commit/dbfa2854ff31a863326bd6660d4e55c6f068db9e",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/facelessuser/soupsieve/commit/dbfa2854ff31a863326bd6660d4e55c6f068db9e"
                },
                {
                    "name": "https://github.com/facelessuser/soupsieve/releases/tag/3.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/facelessuser/soupsieve/releases/tag/3.0"
                }
            ],
            "affected": [
                {
                    "vendor": "facelessuser",
                    "product": "soupsieve",
                    "versions": [
                        {
                            "version": "< 3.0",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-11-12T16:57:01.566Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 3.0, the CSS_ESCAPES and IDENTIFIER regular-expression subpatterns can backtrack exponentially on runs of ambiguous digit escapes in an attribute-name or tag position of an otherwise valid selector. The failure occurs during selector compilation through soupsieve.compile() or Beautiful Soup select() before SELECTOR_LIMIT is applied, so an application that accepts untrusted selector strings can have a worker stalled by a short input. This issue is fixed in version 3.0."
                }
            ],
            "source": {
                "advisory": "GHSA-6655-6qjp-jx7x",
                "discovery": "UNKNOWN"
            }
        }
    }
}