CVE-2026-126191

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Source
https://cve.org/CVERecord?id=CVE-2026-126191
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126191.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-126191
Aliases
  • GHSA-6655-6qjp-jx7x
Published
2026-11-12T16:57:01Z
Modified
2026-11-13T02:47:25Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Soup Sieve: Exponential ReDoS in selector compilation via \9-run in CSS_ESCAPES/IDENTIFIER
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-1333"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126191.json"
}
References

Affected packages

Git / github.com/facelessuser/soupsieve

Affected ranges

Type
GIT
Repo
https://github.com/facelessuser/soupsieve
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
e39e4e7fa57d693da8d1f2422a7c9a9c7a6d5cc7
Fixed
dbfa2854ff31a863326bd6660d4e55c6f068db9e
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "3.0"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "dbfa2854ff31a863326bd6660d4e55c6f068db9e"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "3.0",
            "range": [
                {
                    "fixed": "e39e4e7fa57d693da8d1f2422a7c9a9c7a6d5cc7"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

0.*
0.4.0
0.5.0
0.5.1
0.5.2
0.5.3
0.6.0
1.*
1.0.0
1.0.0b1
1.0.0b2
1.0.1
1.0.2
1.1.0
1.2.0
1.2.1
1.3.0
1.3.1
1.4.0
1.5.0
1.6.0
1.6.1
1.7.0
1.7.1
1.7.2
1.7.3
1.8.0
1.9.0
1.9.1
1.9.2
1.9.3
1.9.4
2.*
2.0.0
2.0.1
2.1.0
2.10
2.2
2.2.1
2.3
2.3.1
2.3.2
2.3.2.post1
2.4
2.4.1
2.5
2.6
2.7
2.8
2.8.1
2.8.2
2.8.3
2.8.4
2.9
2.9.1
2.9.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126191.json"