# CVE-2026-126190: Soup Sieve: Polynomial-time denial of service in the descendant combinator

Status: published. Published: 2026-11-12. Updated: 2026-11-12.

Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 4.0, Soup Sieve repeatedly walks the same ancestors while matching descendant combinators, and each additional descendant combinator raises the polynomial degree of the work on deeply nested attacker-influenced HTML or XML. Applications using selectors such as section div div through select(), select_one(), or Beautiful Soup CSS APIs against untrusted documents can have a worker occupied for seconds or minutes, while trusted-only document processing is not affected. Selectors compiled with NOCACHE continue to use the old uncached behavior. This issue is fixed in version 4.0.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- facelessuser / soupsieve: < 4.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: GitHub_M

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-407

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/facelessuser/soupsieve/security/advisories/GHSA-mmhr-3c5m-f64f (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/facelessuser/soupsieve/pull/351 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/facelessuser/soupsieve/commit/ff1a5ce7e5addc31626d7b6053511fecdb4f6320 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/facelessuser/soupsieve/releases/tag/4.0 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/facelessuser/soupsieve/commit/ff1a5ce7e5addc31626d7b6053511fecdb4f6320 (security-advisories@github.com)

- https://github.com/facelessuser/soupsieve/pull/351 (security-advisories@github.com)

- https://github.com/facelessuser/soupsieve/releases/tag/4.0 (security-advisories@github.com)

- https://github.com/facelessuser/soupsieve/security/advisories/GHSA-mmhr-3c5m-f64f (security-advisories@github.com)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-126190; retrieved 2026-11-12; source updated 2026-11-12

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-126190; retrieved 2026-11-12; source updated 2026-11-12

Revision: 745bb417608d61aeb9180e8e9ef095864c2d58630afa3a54967ab830ce91d38b

Canonical: https://y2.dev/cve/CVE-2026-126190

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