{"id":"CVE-2026-3276","summary":"Potential DoS via quadratic complexity in unicodedata.normalize()","details":"unicodedata.normalize() can take excessive CPU time when processing\nspecially crafted Unicode input containing long runs of combining characters\nwith alternating Canonical Combining Class values.\nThis affects all normalization forms.","aliases":["BIT-libpython-2026-3276","BIT-python-2026-3276","BIT-python-min-2026-3276","PSF-2026-25"],"modified":"2026-11-11T02:48:51.887541844Z","published":"2026-06-03T14:29:39.727Z","related":["SUSE-SU-2026:23191-1","SUSE-SU-2026:23212-1","SUSE-SU-2026:23743-1","SUSE-SU-2026:3530-1","SUSE-SU-2026:3548-1","SUSE-SU-2026:3560-1","SUSE-SU-2026:3569-1","SUSE-SU-2026:3601-1","SUSE-SU-2026:3635-1","SUSE-SU-2026:3648-1","SUSE-SU-2026:3649-1","SUSE-SU-2026:3655-1","SUSE-SU-2026:3855-1","SUSE-SU-2026:3862-1","SUSE-SU-2026:4174-1","SUSE-SU-2026:4534-1","SUSE-SU-2026:4580-1","SUSE-SU-2026:4581-1","SUSE-SU-2026:4582-1","SUSE-SU-2026:4583-1","SUSE-SU-2026:4584-1","SUSE-SU-2026:4585-1","SUSE-SU-2026:4743-1","SUSE-SU-2026:4744-1","SUSE-SU-2026:4754-1","openSUSE-SU-2026:11101-1","openSUSE-SU-2026:11181-1","openSUSE-SU-2026:11426-1","openSUSE-SU-2026:11427-1","openSUSE-SU-2026:11428-1","openSUSE-SU-2026:11534-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3276.json","cna_assigner":"PSF","cwe_ids":["CWE-407"]},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/06/03/15"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3276.json"},{"type":"ADVISORY","url":"https://mail.python.org/archives/list/security-announce@python.org/thread/PP5HB4K7727OBBM76KA2ILID76K3OZGZ/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3276"},{"type":"REPORT","url":"https://github.com/python/cpython/issues/149079"},{"type":"FIX","url":"https://github.com/python/cpython/commit/6b505d1f41f8f3ea0fe5a4786d3a8fff1875cfc0"},{"type":"FIX","url":"https://github.com/python/cpython/commit/90748760d38ca3ac5fc6788a69becab905c95598"},{"type":"FIX","url":"https://github.com/python/cpython/commit/991224b1e8311c85f198f6dd8208bf8cff7fc26f"},{"type":"FIX","url":"https://github.com/python/cpython/commit/ba785b88add96acbf403d65cb157fb2743a33a32"},{"type":"FIX","url":"https://github.com/python/cpython/commit/c5512bd7c1dc28055660565275012766941d3066"},{"type":"FIX","url":"https://github.com/python/cpython/commit/d3ab945af25b28dfe13ac6cb40c124a01b33ce1f"},{"type":"FIX","url":"https://github.com/python/cpython/commit/db744c0776c1d5dd11aaa70eff2a6993c408bacc"},{"type":"FIX","url":"https://github.com/python/cpython/commit/e322a1857084d521f79f45181b776f62e6acfc2c"},{"type":"FIX","url":"https://github.com/python/cpython/pull/149080"},{"type":"PACKAGE","url":"https://github.com/python/cpython"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"3a19c2f0b3e91ce8f23d0cc64d4c9ee557823f24"},{"introduced":"deaf509e8fc6e0363bd6f26d52ad42f976ec42f2"},{"fixed":"41388c9cb160d0886d5ca00d2e6c8782608a4549"},{"introduced":"0fb18b02c8ad56299d6a2910be0bab8ad601ef24"},{"fixed":"2abcf904b8dac8c999d2b3aac76681abb333798a"},{"introduced":"60403a5409ff2c3f3b07dd2ca91a7a3e096839c7"},{"fixed":"fd17997c3866d61e0e7bd8201b1d8f35b40a40bd"},{"introduced":"ebf955df7a89ed0c7968f79faec1de49f61ed7cb"},{"fixed":"c63aec69bd59c55314c06c23f4c22c03de76fe45"},{"introduced":"f31a89bb901067dd105b00cfa90523cf7ffdbbdd"},{"fixed":"94a64bbc6ce89644cf02b82c723d9cc37f6a1870"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"0"},{"fixed":"3.10.21"}]},{"range":[{"introduced":"3.11.0"},{"fixed":"3.11.16"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"range":[{"introduced":"3.12.0"},{"fixed":"3.12.14"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"strategy":"StandardRange","range":[{"introduced":"3.13.0"},{"fixed":"3.13.14"}],"source":"AFFECTED_FIELD"},{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"3.14.0"},{"fixed":"3.14.6"}]},{"range":[{"introduced":"3.15.0a1"},{"fixed":"3.15.0b2"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"}]}}],"versions":["v3.14.5","v3.15.0b1","v3.14.5rc1","v3.13.13","v3.14.4","v3.12.13","v3.10.20","v3.11.15","v3.13.12","v3.14.3","v3.14.2","v3.13.11","v3.13.10","v3.14.1","v3.13.8","v3.11.14","v3.10.19","v3.12.12","v3.14.0","v3.13.7","v3.13.6","v3.13.5","v3.13.4","v3.11.13","v3.10.18","v3.12.11","v3.13.3","v3.11.12","v3.12.10","v3.10.17","v3.13.2","v3.12.9","v3.13.1","v3.12.8","v3.10.16","v3.11.11","v3.13.0","v3.12.7","v3.11.10","v3.10.15","v3.12.6","v3.12.5","v3.12.4","v3.12.3","v3.11.9","v3.10.14","v3.12.2","v3.11.8","v3.12.1","v3.11.7","v3.11.6","v3.12.0","v3.11.5","v3.10.13","v3.11.4","v3.10.12","v3.10.11","v3.11.3","v3.10.10","v3.11.2","v3.10.9","v3.11.1","v3.11.0rc2","v3.10.8","v3.10.7","v3.11.0rc1","v3.10.6","v3.11.0b5","v3.11.0b4","v3.10.5","v3.11.0b3","v3.11.0b2","v3.11.0b1","v3.11.0a7","v3.10.4","v3.10.3","v3.11.0a6","v3.11.0a5","v3.11.0a4","v3.10.2","v3.11.0a3","v3.10.1","v3.10.0rc2","v3.10.0rc1","v3.10.0b4","v3.10.0b3","v3.10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