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Database

Asymmetric denial of service - ReDoS In python3

Description

unicodedata.normalize() can take excessive CPU time when processing specially crafted Unicode input containing long runs of combining characters with alternating Canonical Combining Class values. This affects all normalization forms.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem
Component
Affected version
Patched versions

1-10 of 17

10

Aliases

1. CVE-2026-32762. NVD-2026-32763. OSV-2026-32764. OSV-DEBIAN-2026-32765. OSV-ALPINE-2026-32766. GCVE-2026-32767. SECURITY-TRACKER-CVE-2026-32768. https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3276.json9. mail.python.org10. SECURITY-CVE-2026-3276

References

1. http://www.openwall.com/lists/oss-security/2026/06/03/152. https://github.com/python/cpython/issues/1490793. https://github.com/python/cpython/commit/6b505d1f41f8f3ea0fe5a4786d3a8fff1875cfc04. https://github.com/python/cpython/commit/90748760d38ca3ac5fc6788a69becab905c955985. https://github.com/python/cpython/commit/991224b1e8311c85f198f6dd8208bf8cff7fc26f6. https://github.com/python/cpython/commit/ba785b88add96acbf403d65cb157fb2743a33a327. https://github.com/python/cpython/commit/c5512bd7c1dc28055660565275012766941d30668. https://github.com/python/cpython/commit/d3ab945af25b28dfe13ac6cb40c124a01b33ce1f9. https://github.com/python/cpython/commit/db744c0776c1d5dd11aaa70eff2a6993c408bacc10. https://github.com/python/cpython/commit/e322a1857084d521f79f45181b776f62e6acfc2c11. https://github.com/python/cpython/pull/149080

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FLAT-AKFPE – Vulnerability | Fluid Attacks Database