High 8.7Published Jul 8, 2026

CVE-2026-55195py7zr: Decompression bomb (zip bomb) denial of service via unchecked extraction size

Updated under an hour ago (Oct 27, 2026, 9:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for miurahr py7zr

Exploited in the last 30 days

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.

CVSS: 8.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-409
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

miurahr py7zr miurahr:py7zr (from the name)	before 1.1.3	CNA record

References

References

https://github.com/miurahr/py7zr/security/advisories/GHSA-gjrg-mpp7-g774	x-refsource-confirm
https://github.com/miurahr/py7zr/commit/28faf107b64374fa5a02bfb93aa2024e281ca97b	x-refsource-misc
https://github.com/miurahr/py7zr/releases/tag/v1.1.3	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.