{"id":"CVE-2026-55195","aliases":["GHSA-gjrg-mpp7-g774","PYSEC-2026-2972"],"url":"https://o3.security/vulnerability/CVE-2026-55195","summary":"py7zr: Decompression bomb (zip bomb) denial of service via unchecked extraction size","details":"py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, py7zr's Worker.decompress() extracted archive entries without tracking total decompressed size, allowing a crafted .7z file such as a 15.6 KB archive that expands to 100 MB to exhaust disk or memory before extraction completes. This issue is fixed in version 1.1.3.","published":"2026-07-08T20:30:58.654Z","modified":"2026-08-12T03:51:15.877348906Z","cvss":null,"epss":{"score":0.0021,"percentile":0.11494,"asOf":"2026-08-21"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"py7zr","fixedVersion":"1.1.3"}],"fix":{"url":"https://github.com/miurahr/py7zr/commit/28faf107b64374fa5a02bfb93aa2024e281ca97b","label":"miurahr/py7zr@28faf10"},"references":[{"type":"WEB","url":"https://github.com/miurahr/py7zr/releases/tag/v1.1.3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55195.json"},{"type":"ADVISORY","url":"https://github.com/miurahr/py7zr/security/advisories/GHSA-gjrg-mpp7-g774"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55195"},{"type":"FIX","url":"https://github.com/miurahr/py7zr/commit/28faf107b64374fa5a02bfb93aa2024e281ca97b"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:15.877348906Z"}}