{"id":"CVE-2026-15310","summary":"zipfile: bzip2/LZMA/Zstandard members decompress without a max_length bound, defeating chunked-read memory limits","details":"When decompressing crafted zip files using the bzip/LZMA/Zstandard \n\ncompressions, Python could use an attacker-controlled size to \n\npre-allocate memory, possibly resulting in memory exhaustion.","aliases":["BIT-libpython-2026-15310","BIT-python-2026-15310","BIT-python-min-2026-15310","PSF-2026-39"],"modified":"2026-10-22T10:31:26.235581338Z","published":"2026-08-25T15:07:58.054Z","related":["SUSE-SU-2026:24138-1","SUSE-SU-2026:4396-1","SUSE-SU-2026:4534-1","SUSE-SU-2026:4630-1","SUSE-SU-2026:4743-1","SUSE-SU-2026:4744-1","SUSE-SU-2026:4754-1","SUSE-SU-2026:4809-1","openSUSE-SU-2026:11748-1","openSUSE-SU-2026:11868-1","openSUSE-SU-2026:11886-1","openSUSE-SU-2026:11949-1","openSUSE-SU-2026:11950-1","openSUSE-SU-2026:11975-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15310.json","cna_assigner":"PSF","cwe_ids":["CWE-400"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15310.json"},{"type":"ADVISORY","url":"https://mail.python.org/archives/list/security-announce@python.org/thread/YUHXURX2WZGKGNA4ANYBQS2VZRYQ5JNK/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-15310"},{"type":"REPORT","url":"https://github.com/python/cpython/issues/156002"},{"type":"FIX","url":"https://github.com/python/cpython/commit/09a2e7e6678b4f65449e7ad8f112c48f944591e2"},{"type":"FIX","url":"https://github.com/python/cpython/commit/1b424c0178a01e155fd0267dc28a8fc1159b33a8"},{"type":"FIX","url":"https://github.com/python/cpython/commit/31980e84b9a708424a0a1dfecde3fc991e313f89"},{"type":"FIX","url":"https://github.com/python/cpython/commit/6257029de42ef89b67f3d20137de87d43e197530"},{"type":"FIX","url":"https://github.com/python/cpython/commit/9d167992b59cf5e23c66b9ed742b13f5925f7d70"},{"type":"FIX","url":"https://github.com/python/cpython/commit/c2bfbcdd1a11690507a10bc0998f95b8dc6b6fac"},{"type":"FIX","url":"https://github.com/python/cpython/commit/dcdd406ddbfc4cb29b24c3df17cbabe21d316ce1"},{"type":"FIX","url":"https://github.com/python/cpython/commit/e2311cfb3dd518f008f312fe0631f4f7490d237a"},{"type":"FIX","url":"https://github.com/python/cpython/commit/f507e6946a3194e83e1d7b8ee6e14567175e46de"},{"type":"FIX","url":"https://github.com/python/cpython/commit/f897dbf2f36a5935700b7c2d94d4681d2136b7d4"},{"type":"FIX","url":"https://github.com/python/cpython/pull/156003"},{"type":"PACKAGE","url":"https://github.com/python/cpython"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"acb4dc12b6df8615af7b43120ef601e04072f7d2"},{"introduced":"deaf509e8fc6e0363bd6f26d52ad42f976ec42f2"},{"fixed":"e6392eb68a39cef49c9fe6431253050caa17a426"},{"introduced":"0fb18b02c8ad56299d6a2910be0bab8ad601ef24"},{"fixed":"e848e4b09ca4bc67c0041c9ce7526dae471d4c36"},{"introduced":"60403a5409ff2c3f3b07dd2ca91a7a3e096839c7"},{"fixed":"cbc944f4bc59639a444dd971c737788ba2283a91"},{"introduced":"ebf955df7a89ed0c7968f79faec1de49f61ed7cb"},{"fixed":"8e6e75d9102e39bed2a2b279203a396741180f12"},{"introduced":"f31a89bb901067dd105b00cfa90523cf7ffdbbdd"},{"fixed":"435c9e5a798c99653e3ab64ce29baed0e4f3dfee"},{"fixed":"f897dbf2f36a5935700b7c2d94d4681d2136b7d4"},{"fixed":"1b424c0178a01e155fd0267dc28a8fc1159b33a8"},{"fixed":"31980e84b9a708424a0a1dfecde3fc991e313f89"},{"fixed":"e2311cfb3dd518f008f312fe0631f4f7490d237a"},{"fixed":"f507e6946a3194e83e1d7b8ee6e14567175e46de"},{"fixed":"9d167992b59cf5e23c66b9ed742b13f5925f7d70"},{"fixed":"dcdd406ddbfc4cb29b24c3df17cbabe21d316ce1"},{"fixed":"09a2e7e6678b4f65449e7ad8f112c48f944591e2"},{"fixed":"6257029de42ef89b67f3d20137de87d43e197530"},{"fixed":"c2bfbcdd1a11690507a10bc0998f95b8dc6b6fac"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"0"},{"fixed":"3.10.22"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"range":[{"introduced":"3.11.0"},{"fixed":"3.11.17"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"3.12.0"},{"fixed":"3.12.15"}]},{"range":[{"introduced":"3.13.0"},{"fixed":"3.13.16"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"3.14.0"},{"fixed":"3.14.8"}]},{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"3.15.0a1"},{"fixed":"3.15.0rc2"}]},{"range":[{"fixed":"f897dbf2f36a5935700b7c2d94d4681d2136b7d4"}],"source":"REFERENCES_COMMIT"},{"range":[{"fixed":"1b424c0178a01e155fd0267dc28a8fc1159b33a8"}],"source":"REFERENCES_COMMIT"},{"range":[{"fixed":"31980e84b9a708424a0a1dfecde3fc991e313f89"}],"source":"REFERENCES_COMMIT"},{"range":[{"fixed":"e2311cfb3dd518f008f312fe0631f4f7490d237a"}],"source":"REFERENCES_COMMIT"},{"range":[{"fixed":"f507e6946a3194e83e1d7b8ee6e14567175e46de"}],"source":"REFERENCES_COMMIT"},{"range":[{"fixed":"9d167992b59cf5e23c66b9ed742b13f5925f7d70"}],"source":"REFERENCES_COMMIT"},{"range":[{"fixed":"dcdd406ddbfc4cb29b24c3df17cbabe21d316ce1"}],"source":"REFERENCES_COMMIT"},{"range":[{"fixed":"09a2e7e6678b4f65449e7ad8f112c48f944591e2"}],"source":"REFERE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