CVE catalog
CVE-2026-55195
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
- Severity
- High · CVSS 8.7
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.32% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | py7zr | sid | 1.1.4+dfsg-1 | fixed |
| Debian | py7zr | forky | 1.1.4+dfsg-1 | fixed |
| Debian | py7zr | trixie | 0.22.0+dfsg-1 | vulnerable |
| Debian | py7zr | bookworm | 0.11.3+dfsg-5 | vulnerable |
| Cpe | py7zr | Not reported | Not reported | vulnerable |
| PyPI | py7zr | Not reported | 1.1.3 | fixed |
| PyPI | py7zr | Not reported | 1.1.3 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | py7zr | source | sid | 1.1.3+dfsg-1 | not yet assigned | Not reported | Not reported |
| Debian | py7zr | source | forky | 1.1.3+dfsg-1 | not yet assigned | Not reported | Not reported |
| Debian | py7zr | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | py7zr | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| PyPI | py7zr | PyPI | Not reported | 1.1.3 | Not reported | GHSA-GJRG-MPP7-G774 | Not reported |
| PyPI | py7zr | PyPI | Not reported | 1.1.3 | Not reported | PYSEC-2026-2972 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-py7zr]Affected
Source package: [py7zr]
Details (2)
0.11.3+dfsg-5· amd64 · bookwormAffected
nvd · py7zr · debian · bookworm; nvd · py7zr · debian · 12
0.11.3+dfsg-5· arm64 · bookwormAffected
nvd · py7zr · debian · bookworm; nvd · py7zr · debian · 12
- [python-py7zr-doc]Affected
Source package: [py7zr]
Details (2)
0.11.3+dfsg-5· all · bookwormAffected
nvd · py7zr · debian · bookworm; nvd · py7zr · debian · 12
0.11.3+dfsg-5· all · bookwormAffected
nvd · py7zr · debian · bookworm; nvd · py7zr · debian · 12
[Debian 13 (Trixie)]
- [python3-py7zr]Affected
Source package: [py7zr]
Details (4)
0.22.0+dfsg-1· all · trixieAffected
nvd · py7zr · debian · 13
0.22.0+dfsg-1· all · trixieAffected
nvd · py7zr · debian · 13
1.0.0+dfsg1-3~bpo13+1· all · trixie-backportsAffected
nvd · py7zr · debian · 13
1.0.0+dfsg1-3~bpo13+1· all · trixie-backportsAffected
nvd · py7zr · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11112-1.json]
- [https://github.com/miurahr/py7zr/commit/28faf107b64374fa5a02bfb93aa2024e281ca97b]
- [https://github.com/miurahr/py7zr/releases/tag/v1.1.3]
- [https://github.com/miurahr/py7zr/security/advisories/GHSA-gjrg-mpp7-g774]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-55195]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-55195]
- [https://osv.dev/vulnerability/PYSEC-2026-2972]
- [https://security-tracker.debian.org/tracker/CVE-2026-55195]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55195.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]