MediumFix available
lrzsz — security advisory
lrzsz before 0.13.0 contains a heap-based buffer overflow vulnerability in procheader() of the lrz receive utility when copying overlong sender-supplied filenames into Pathname. Malicious ZMODEM senders can supply filenames up to 8192 bytes, overflowing the buffer via sprintf() in pipe mode or strcpy() to corrupt heap memory and crash lrz.
- Products
- lrzsz
- Affected versions
- 0.12.21-10, 0.12.21-11, 0.12.21rc-0.1, 0.12.21rc-0.2, 0.12.21rc-0.3, 0.12.21rc-1, 0.12.21rc-2, 0.12.21rc-3, 0.12.21rc-4, 0.12.21rc-5, 0.13.1-1
- Fixed versions
- 0.12.21rc-5
- CVEs
- CVE-2026-105842
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 09:01 UTC · Revision 1
Source evidence
lrzsz before 0.13.0 contains a heap-based buffer overflow vulnerability in procheader() of the lrz receive utility when copying overlong sender-supplied filenames into Pathname. Malicious ZMODEM senders can supply filenames up to 8192 bytes, overflowing the buffer via sprintf() in pipe mode or strcpy() to corrupt heap memory and crash lrz.
osv:DEBIAN-CVE-2026-105842
lrzsz
Fixed versions: Not specified
lrzsz
Fixed versions: Not specified
lrzsz
Fixed versions: 0.12.21rc-5
Complete source record
{
"id": "651ecd25638218691bb06b7b6a6e9b5a1cd8d9988562ad3569a95a8fe7380696",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-105842",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-105842",
"summary": "lrzsz before 0.13.0 contains a heap-based buffer overflow vulnerability in procheader() of the lrz receive utility when copying overlong sender-supplied filenames into Pathname. Malicious ZMODEM senders can supply filenames up to 8192 bytes, overflowing the buffer via sprintf() in pipe mode or strcpy() to corrupt heap memory and crash lrz.",
"evidence": "osv:DEBIAN-CVE-2026-105842",
"products": [
{
"name": {
"value": "lrzsz",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.12.21-10",
"evidence": "/affected/0/versions"
},
{
"value": "0.12.21-11",
"evidence": "/affected/0/versions"
},
{
"value": "0.12.21rc-0.1",
"evidence": "/affected/0/versions"
},
{
"value": "0.12.21rc-0.2",
"evidence": "/affected/0/versions"
},
{
"value": "0.12.21rc-0.3",
"evidence": "/affected/0/versions"
},
{
"value": "0.12.21rc-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.12.21rc-2",
"evidence": "/affected/0/versions"
},
{
"value": "0.12.21rc-3",
"evidence": "/affected/0/versions"
},
{
"value": "0.12.21rc-4",
"evidence": "/affected/0/versions"
},
{
"value": "0.12.21rc-5",
"evidence": "/affected/0/versions"
},
{
"value": "0.13.1-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "lrzsz",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.12.21rc-0.2",
"evidence": "/affected/1/versions"
},
{
"value": "0.12.21rc-0.3",
"evidence": "/affected/1/versions"
},
{
"value": "0.12.21rc-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.12.21rc-2",
"evidence": "/affected/1/versions"
},
{
"value": "0.12.21rc-3",
"evidence": "/affected/1/versions"
},
{
"value": "0.12.21rc-4",
"evidence": "/affected/1/versions"
},
{
"value": "0.12.21rc-5",
"evidence": "/affected/1/versions"
},
{
"value": "0.13.1-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "lrzsz",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.12.21rc-5",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "0.12.21rc-0.2",
"evidence": "/affected/2/versions"
},
{
"value": "0.12.21rc-0.3",
"evidence": "/affected/2/versions"
},
{
"value": "0.12.21rc-1",
"evidence": "/affected/2/versions"
},
{
"value": "0.12.21rc-2",
"evidence": "/affected/2/versions"
},
{
"value": "0.12.21rc-3",
"evidence": "/affected/2/versions"
},
{
"value": "0.12.21rc-4",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-105842",
"aliases": [
"DEBIAN-CVE-2026-105842"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/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": "lrzsz",
"purl": "pkg:deb/debian/lrzsz?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"0.12.21-10",
"0.12.21-11",
"0.12.21rc-0.1",
"0.12.21rc-0.2",
"0.12.21rc-0.3",
"0.12.21rc-1",
"0.12.21rc-2",
"0.12.21rc-3",
"0.12.21rc-4",
"0.12.21rc-5",
"0.13.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-105842.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "lrzsz",
"purl": "pkg:deb/debian/lrzsz?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"0.12.21rc-0.2",
"0.12.21rc-0.3",
"0.12.21rc-1",
"0.12.21rc-2",
"0.12.21rc-3",
"0.12.21rc-4",
"0.12.21rc-5",
"0.13.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-105842.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.12.21rc-5"
}
]
}
],
"package": {
"name": "lrzsz",
"purl": "pkg:deb/debian/lrzsz?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"0.12.21rc-0.2",
"0.12.21rc-0.3",
"0.12.21rc-1",
"0.12.21rc-2",
"0.12.21rc-3",
"0.12.21rc-4"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-105842.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-13T08:00:06.635062054Z",
"provider": "osv",
"upstream": [
"CVE-2026-105842"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-105842"
]
},
"related_cves": [
{
"value": "CVE-2026-105842",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 307463,
"published_at": "2026-10-06T14:17:41.62+00:00"
}