High
lrzsz — security advisory
lrzsz before 0.13.0 contains a path traversal vulnerability in the lrz receive utility's restricted mode that allows malicious ZMODEM senders to write files outside the current directory using absolute pathnames. Because checkpath() in src/lrz.c only rejects '../' sequences unless built with --enable-pubdir, attackers can send files named with absolute paths to overwrite any file writable by the receiving user.
- Products
- lrzsz
- Affected versions
- 0.12.21-10, 0.12.21-10~build0.14.04.1, 0.12.21-10~build0.16.04.1, 0.12.21-10~build0.18.04.1, 0.12.21-11, 0.12.21-11build1, 0.12.21-5, 0.12.21-7, 0.12.21-8, 0.12.21-8build1, 0.12.21rc-0.2, 0.12.21rc-0.3, 0.12.21rc-1, 0.12.21rc-2, 0.12.21rc-4
- Fixed versions
- Not specified
- CVEs
- CVE-2026-105840
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:53 UTC · Revision 1
Source evidence
lrzsz before 0.13.0 contains a path traversal vulnerability in the lrz receive utility's restricted mode that allows malicious ZMODEM senders to write files outside the current directory using absolute pathnames. Because checkpath() in src/lrz.c only rejects '../' sequences unless built with --enable-pubdir, attackers can send files named with absolute paths to overwrite any file writable by the receiving user.
osv:UBUNTU-CVE-2026-105840
lrzsz
Fixed versions: Not specified
lrzsz
Fixed versions: Not specified
lrzsz
Fixed versions: Not specified
lrzsz
Fixed versions: Not specified
lrzsz
Fixed versions: Not specified
lrzsz
Fixed versions: Not specified
lrzsz
Fixed versions: Not specified
lrzsz
Fixed versions: Not specified
Complete source record
{
"id": "e0326d0261d4706b059c4fb77dea02c3469a0c0a2980e11e6dbf99d9ace31b39",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-105840",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-105840",
"summary": "lrzsz before 0.13.0 contains a path traversal vulnerability in the lrz receive utility's restricted mode that allows malicious ZMODEM senders to write files outside the current directory using absolute pathnames. Because checkpath() in src/lrz.c only rejects '../' sequences unless built with --enable-pubdir, attackers can send files named with absolute paths to overwrite any file writable by the receiving user.",
"evidence": "osv:UBUNTU-CVE-2026-105840",
"products": [
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"evidence": "/affected/0/package/name"
},
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{
"value": "0.12.21-5",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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{
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{
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"evidence": "/affected/5/versions"
},
{
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},
{
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},
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{
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"evidence": "/affected/6/versions"
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{
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},
{
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},
{
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},
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"evidence": "/affected/7/versions"
},
{
"value": "0.12.21rc-0.3",
"evidence": "/affected/7/versions"
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],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-105840",
"aliases": [
"UBUNTU-CVE-2026-105840"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
},
{
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}
],
"affected": [
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},
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"0.12.21-7",
"0.12.21-10~build0.14.04.1"
],
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},
"ecosystem_specific": {
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{
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],
"package": {
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"purl": "pkg:deb/ubuntu/lrzsz?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"0.12.21-8",
"0.12.21-10~build0.16.04.1"
],
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},
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"ecosystem": "Ubuntu:18.04:LTS"
},
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"0.12.21-8build1",
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},
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},
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],
"modified": "2026-10-17T12:59:46.800977754Z",
"provider": "osv",
"upstream": [
"CVE-2026-105840"
],
"references": [
"https://ubuntu.com/security/CVE-2026-105840",
"https://www.cve.org/CVERecord?id=CVE-2026-105840",
"https://ohse.de/uwe/software/lrzsz/NEWS-0.13.0.html"
]
},
"related_cves": [
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"evidence": "/upstream"
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],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 359765,
"published_at": "2026-10-06T14:17:00+00:00"
}