{"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":"2026-08-31T11:25:26.656166408Z","published":"2026-08-25T15:07:58.054Z","database_specific":{"cwe_ids":["CWE-400"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15310.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"fixed":"3.15.0"}]}],"cna_assigner":"PSF"},"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/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":"f897dbf2f36a5935700b7c2d94d4681d2136b7d4"}],"database_specific":{"source":"REFERENCES"}}],"versions":["v3.15.0b1","v3.15.0a8","v3.15.0a7","v3.15.0a6","v3.15.0a5","v3.15.0a4","v3.15.0a3","v3.15.0a2","v3.15.0a1","v3.14.0b1","v3.14.0a7","v3.14.0a6","v3.14.0a5","v3.14.0a4","v3.14.0a3","v3.14.0a2","v3.14.0a1","v3.13.0b1","v3.13.0a6","v3.13.0a5","v3.13.0a4","v3.13.0a3","v3.13.0a2","v3.13.0a1","v3.12.0b1","v3.12.0a7","v3.12.0a6","v3.12.0a5","v3.12.0a4","v3.12.0a3","v3.12.0a2","v3.12.0a1","v3.11.0b1","v3.11.0a7","v3.11.0a6","v3.11.0a5","v3.11.0a4","v3.11.0a3","v3.10.0a7","v3.10.0a1","v3.9.0a2","v3.7.0a2","v3.6.0b1","v3.6.0a3","v3.5.0b1","v3.5.0a4","v3.5.0a3","v3.5.0a2","v3.5.0a1","v3.4.0b3","v3.4.0b2","v3.4.0b1","v3.4.0a4","v3.4.0a3","v3.4.0a2","v3.4.0a1","v3.3.0rc3","v3.3.0rc2","v3.3.0rc1","v3.3.0b2","v3.3.0b1","v3.3.0a4","v3.3.0a3","v3.3.0a2","v3.2rc3","v3.2rc2","v3.2rc1","v3.2b2","v3.2b1","v3.2a4","v3.2a3","v3.2a2","v3.2a1","v3.1","v3.1rc2","v3.1rc1","v3.1b1","v3.1a2","v3.1a1","v3.0rc3","v3.0rc2","v3.0rc1","v3.0b3","v3.0b2","v3.0b1","v3.0a5","v3.0a4","v3.0a3","v3.0a2","v3.0a1","v2.4","v2.4c1","v2.4b2","v2.4b1","v2.4a3","v2.4a2","v2.4a1","v2.3c2","v2.3c1","v2.2a3","v2.1","v2.1c2","v2.1c1","v2.1b2","v2.1b1","v2.1a2","v2.1a1","v2.0","v2.0c1","v2.0b2","v2.0b1","v1.6a2","v1.6a1","v1.5.2","v1.5.2c1","v1.5.2b2","v1.5.2b1","v1.5.2a2","v1.5.2a1","v1.5.1","v1.5","v1.5b2","v1.5b1","v1.5a4","v1.5a3","v1.5a2","v1.5a1","v1.4","v1.4b3","v1.4b2","v1.4b1","v1.3","v1.3b1","v1.2","v1.2b4","v1.2b3","v1.2b2","v1.2b1","v1.1.1","v1.1","v1.0.2","v1.0.1","v0.9.9","v0.9.8"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-15310.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"}]}