HighFix available
py7zr — security advisory
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.
- Products
- py7zr
- Affected versions
- 0.11.3+dfsg-5, 0.11.3+dfsg-6, 0.11.3+dfsg-7, 0.11.3+dfsg-8, 0.21.0+dfsg-1, 0.21.0+dfsg-2, 0.21.1+dfsg-1, 0.22.0+dfsg-1, 1.0.0+dfsg1-1, 1.0.0+dfsg1-2, 1.0.0+dfsg1-3, 1.0.0+dfsg1-3~bpo13+1, 1.0.0+dfsg1-4, 1.0.0+dfsg1-5, 1.1.0+dfsg-1~exp1, 1.1.2+dfsg-1, 1.1.2+dfsg-1~exp1, 1.1.2+dfsg-2, 1.1.2+really1.1.0+dfsg-1, 1.1.2-1+really1.1.0+dfsg-1, 1.1.2-1+really1.1.0+dfsg-2, 1.1.3+dfsg-1, 1.1.3+dfsg-2, 1.1.3+dfsg-3, 1.1.3+dfsg-4, 1.1.4+dfsg-1
- Fixed versions
- 1.1.3+dfsg-1
- CVEs
- CVE-2026-55195
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 13:35 UTC · Revision 2
Source evidence
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.
osv:DEBIAN-CVE-2026-55195
py7zr
Fixed versions: Not specified
py7zr
Fixed versions: Not specified
py7zr
Fixed versions: 1.1.3+dfsg-1
Complete source record
{
"id": "0a3a0f26d60e7b66d2d2b6b2c01ec92148bc400c897bd949c58f180dde16c701",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-55195",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-55195",
"summary": "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.",
"evidence": "osv:DEBIAN-CVE-2026-55195",
"products": [
{
"name": {
"value": "py7zr",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.11.3+dfsg-5",
"evidence": "/affected/0/versions"
},
{
"value": "0.11.3+dfsg-6",
"evidence": "/affected/0/versions"
},
{
"value": "0.11.3+dfsg-7",
"evidence": "/affected/0/versions"
},
{
"value": "0.11.3+dfsg-8",
"evidence": "/affected/0/versions"
},
{
"value": "0.21.0+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.21.0+dfsg-2",
"evidence": "/affected/0/versions"
},
{
"value": "0.21.1+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.22.0+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.0.0+dfsg1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.0.0+dfsg1-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.0.0+dfsg1-3",
"evidence": "/affected/0/versions"
},
{
"value": "1.0.0+dfsg1-3~bpo13+1",
"evidence": "/affected/0/versions"
},
{
"value": "1.0.0+dfsg1-4",
"evidence": "/affected/0/versions"
},
{
"value": "1.0.0+dfsg1-5",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.0+dfsg-1~exp1",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.2+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.2+dfsg-1~exp1",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.2+dfsg-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.2+really1.1.0+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.2-1+really1.1.0+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.2-1+really1.1.0+dfsg-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.3+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.3+dfsg-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.3+dfsg-3",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.3+dfsg-4",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.4+dfsg-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "py7zr",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.22.0+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.0.0+dfsg1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.0.0+dfsg1-2",
"evidence": "/affected/1/versions"
},
{
"value": "1.0.0+dfsg1-3",
"evidence": "/affected/1/versions"
},
{
"value": "1.0.0+dfsg1-3~bpo13+1",
"evidence": "/affected/1/versions"
},
{
"value": "1.0.0+dfsg1-4",
"evidence": "/affected/1/versions"
},
{
"value": "1.0.0+dfsg1-5",
"evidence": "/affected/1/versions"
},
{
"value": "1.1.0+dfsg-1~exp1",
"evidence": "/affected/1/versions"
},
{
"value": "1.1.2+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.1.2+dfsg-1~exp1",
"evidence": "/affected/1/versions"
},
{
"value": "1.1.2+dfsg-2",
"evidence": "/affected/1/versions"
},
{
"value": "1.1.2+really1.1.0+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.1.2-1+really1.1.0+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.1.2-1+really1.1.0+dfsg-2",
"evidence": "/affected/1/versions"
},
{
"value": "1.1.3+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.1.3+dfsg-2",
"evidence": "/affected/1/versions"
},
{
"value": "1.1.3+dfsg-3",
"evidence": "/affected/1/versions"
},
{
"value": "1.1.3+dfsg-4",
"evidence": "/affected/1/versions"
},
{
"value": "1.1.4+dfsg-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "py7zr",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.1.3+dfsg-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "0.22.0+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.0.0+dfsg1-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.0.0+dfsg1-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.0.0+dfsg1-3",
"evidence": "/affected/2/versions"
},
{
"value": "1.0.0+dfsg1-3~bpo13+1",
"evidence": "/affected/2/versions"
},
{
"value": "1.0.0+dfsg1-4",
"evidence": "/affected/2/versions"
},
{
"value": "1.0.0+dfsg1-5",
"evidence": "/affected/2/versions"
},
{
"value": "1.1.0+dfsg-1~exp1",
"evidence": "/affected/2/versions"
},
{
"value": "1.1.2+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.1.2+dfsg-1~exp1",
"evidence": "/affected/2/versions"
},
{
"value": "1.1.2+dfsg-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.1.2+really1.1.0+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.1.2-1+really1.1.0+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.1.2-1+really1.1.0+dfsg-2",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-55195",
"aliases": [
"DEBIAN-CVE-2026-55195"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "py7zr",
"purl": "pkg:deb/debian/py7zr?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"0.11.3+dfsg-5",
"0.11.3+dfsg-6",
"0.11.3+dfsg-7",
"0.11.3+dfsg-8",
"0.21.0+dfsg-1",
"0.21.0+dfsg-2",
"0.21.1+dfsg-1",
"0.22.0+dfsg-1",
"1.0.0+dfsg1-1",
"1.0.0+dfsg1-2",
"1.0.0+dfsg1-3",
"1.0.0+dfsg1-3~bpo13+1",
"1.0.0+dfsg1-4",
"1.0.0+dfsg1-5",
"1.1.0+dfsg-1~exp1",
"1.1.2+dfsg-1",
"1.1.2+dfsg-1~exp1",
"1.1.2+dfsg-2",
"1.1.2+really1.1.0+dfsg-1",
"1.1.2-1+really1.1.0+dfsg-1",
"1.1.2-1+really1.1.0+dfsg-2",
"1.1.3+dfsg-1",
"1.1.3+dfsg-2",
"1.1.3+dfsg-3",
"1.1.3+dfsg-4",
"1.1.4+dfsg-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55195.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "py7zr",
"purl": "pkg:deb/debian/py7zr?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"0.22.0+dfsg-1",
"1.0.0+dfsg1-1",
"1.0.0+dfsg1-2",
"1.0.0+dfsg1-3",
"1.0.0+dfsg1-3~bpo13+1",
"1.0.0+dfsg1-4",
"1.0.0+dfsg1-5",
"1.1.0+dfsg-1~exp1",
"1.1.2+dfsg-1",
"1.1.2+dfsg-1~exp1",
"1.1.2+dfsg-2",
"1.1.2+really1.1.0+dfsg-1",
"1.1.2-1+really1.1.0+dfsg-1",
"1.1.2-1+really1.1.0+dfsg-2",
"1.1.3+dfsg-1",
"1.1.3+dfsg-2",
"1.1.3+dfsg-3",
"1.1.3+dfsg-4",
"1.1.4+dfsg-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55195.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.1.3+dfsg-1"
}
]
}
],
"package": {
"name": "py7zr",
"purl": "pkg:deb/debian/py7zr?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"0.22.0+dfsg-1",
"1.0.0+dfsg1-1",
"1.0.0+dfsg1-2",
"1.0.0+dfsg1-3",
"1.0.0+dfsg1-3~bpo13+1",
"1.0.0+dfsg1-4",
"1.0.0+dfsg1-5",
"1.1.0+dfsg-1~exp1",
"1.1.2+dfsg-1",
"1.1.2+dfsg-1~exp1",
"1.1.2+dfsg-2",
"1.1.2+really1.1.0+dfsg-1",
"1.1.2-1+really1.1.0+dfsg-1",
"1.1.2-1+really1.1.0+dfsg-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55195.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T12:02:46.873389115Z",
"provider": "osv",
"upstream": [
"CVE-2026-55195"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-55195"
]
},
"related_cves": [
{
"value": "CVE-2026-55195",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 452563,
"published_at": "2026-07-08T21:16:49.84+00:00"
}