{"id":"CVE-2026-15310","title":"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.","summary":"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.","severity":"low","cvss":2.1,"cvssVector":"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","cwe":["CWE-400","CWE-770"],"vendor":"Python Software Foundation","product":"CPython","affected":["CPython < 3.12.15","CPython >= 3.13.0 < 3.13.16","CPython >= 3.14.0 < 3.14.8","CPython >= 3.15.0a1 < 3.15.0rc2"],"published":"2026-08-25","updated":"2026-10-02","sourceUpdated":"2026-10-02T01:16:43.337","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-15310","references":[{"url":"https://github.com/python/cpython/commit/09a2e7e6678b4f65449e7ad8f112c48f944591e2","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/1b424c0178a01e155fd0267dc28a8fc1159b33a8","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/31980e84b9a708424a0a1dfecde3fc991e313f89","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/6257029de42ef89b67f3d20137de87d43e197530","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/9d167992b59cf5e23c66b9ed742b13f5925f7d70","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/c2bfbcdd1a11690507a10bc0998f95b8dc6b6fac","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/dcdd406ddbfc4cb29b24c3df17cbabe21d316ce1","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/e2311cfb3dd518f008f312fe0631f4f7490d237a","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/f507e6946a3194e83e1d7b8ee6e14567175e46de","label":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/f897dbf2f36a5935700b7c2d94d4681d2136b7d4","label":"cna@python.org"},{"url":"https://github.com/python/cpython/issues/156002","label":"cna@python.org"},{"url":"https://github.com/python/cpython/pull/156003","label":"cna@python.org"},{"url":"https://mail.python.org/archives/list/security-announce@python.org/thread/YUHXURX2WZGKGNA4ANYBQS2VZRYQ5JNK/","label":"cna@python.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-15310.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-15310"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2523543"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-15310"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-15310"},{"url":"https://access.redhat.com/errata/RHSA-2026:65505"},{"url":"https://access.redhat.com/errata/RHSA-2026:65513"},{"url":"https://access.redhat.com/errata/RHSA-2026:65525"},{"url":"https://access.redhat.com/errata/RHSA-2026:65531"},{"url":"https://access.redhat.com/errata/RHSA-2026:65567"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00526,"epssPercentile":0.44366,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-08-25T15:34:06.442859Z"},"cvssSource":"cna","ingestedAt":"2026-09-11T16:45:47.927Z","patched":["hardened_images"],"scores":{"cna":2.1,"vendor":6.5},"slug":"CVE-2026-15310","body":"## Overview\n\nWhen 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:65505** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65505)\n- **RHSA-2026:65513** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65513)\n- **RHSA-2026:65525** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65525)\n- **RHSA-2026:65531** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65531)\n- **RHSA-2026:65567** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65567)","depth":"sunlit","depthScore":12,"depthScoreParts":{"impact":11.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}