HighFix available
klibc, rsync and 2 more products — security advisory
zlib versions 1.3.1.2 through 1.3.2 contain a heap buffer overflow vulnerability in the gz_vacate() function when processing non-blocking gzwrite() operations with stale external buffer pointers. Attackers can trigger the overflow by calling gzprintf() or gzvprintf() after a write stall, causing an unchecked memmove() to write beyond the internal input buffer boundary.
- Products
- klibc, rsync, zlib, zsync
- Affected versions
- 0.6.2-1ubuntu1, 0.6.2-2ubuntu1, 0.6.2-3ubuntu1, 0.6.2-5, 0.6.2-5build1, 0.6.2-8, 0.6.2-9, 0.6.3-2, 1:1.2.11.dfsg-0ubuntu2, 1:1.2.11.dfsg-0ubuntu2.1, 1:1.2.11.dfsg-0ubuntu2.2, 1:1.2.11.dfsg-1ubuntu3, 1:1.2.11.dfsg-2ubuntu1, 1:1.2.11.dfsg-2ubuntu1.1, 1:1.2.11.dfsg-2ubuntu1.2, 1:1.2.11.dfsg-2ubuntu1.3, 1:1.2.11.dfsg-2ubuntu1.4, 1:1.2.11.dfsg-2ubuntu1.5, 1:1.2.11.dfsg-2ubuntu7, 1:1.2.11.dfsg-2ubuntu9, 1:1.2.11.dfsg-2ubuntu9.1, 1:1.2.11.dfsg-2ubuntu9.2, 1:1.2.13.dfsg-1ubuntu5, 1:1.2.8.dfsg-1ubuntu1, 1:1.2.8.dfsg-1ubuntu1.1, 1:1.2.8.dfsg-1ubuntu1.1+esm1, 1:1.2.8.dfsg-1ubuntu1.1+esm2, 1:1.2.8.dfsg-1ubuntu1.1+esm3, 1:1.2.8.dfsg-2ubuntu4, 1:1.2.8.dfsg-2ubuntu4.1, 1:1.2.8.dfsg-2ubuntu4.3, 1:1.2.8.dfsg-2ubuntu4.3+esm1, 1:1.2.8.dfsg-2ubuntu4.3+esm2, 1:1.3.dfsg+really1.3.1-1ubuntu2, 1:1.3.dfsg+really1.3.1-1ubuntu3, 1:1.3.dfsg+really1.3.1-1ubuntu3.1, 1:1.3.dfsg+really1.3.2-3ubuntu1, 1:1.3.dfsg-3.1ubuntu1, 1:1.3.dfsg-3.1ubuntu2, 1:1.3.dfsg-3.1ubuntu2.1, 1:1.3.dfsg-3.1ubuntu2.2, 1:1.3.dfsg-3ubuntu1, 2.0.1-3.1ubuntu2, 2.0.10-3, 2.0.10-4, 2.0.10-4ubuntu0.1, 2.0.10-4ubuntu0.2, 2.0.13-1, 2.0.13-2, 2.0.13-2ubuntu1, 2.0.13-4, 2.0.13-4ubuntu0.1, 2.0.13-4ubuntu0.2, 2.0.14-1ubuntu1, 2.0.14-1ubuntu2, 2.0.2-1ubuntu1, 2.0.2-1ubuntu2, 2.0.3-0ubuntu1, 2.0.3-0ubuntu1.14.04.1, 2.0.3-0ubuntu1.14.04.2, 2.0.3-0ubuntu1.14.04.3, 2.0.3-0ubuntu1.14.04.3+esm2, 2.0.3-0ubuntu1.14.04.3+esm3, 2.0.3-0ubuntu1.14.04.3+esm4, 2.0.4-4, 2.0.4-6, 2.0.4-7, 2.0.4-8, 2.0.4-8ubuntu1, 2.0.4-8ubuntu1.16.04.1, 2.0.4-8ubuntu1.16.04.2, 2.0.4-8ubuntu1.16.04.3, 2.0.4-8ubuntu1.16.04.4, 2.0.4-8ubuntu1.16.04.4+esm1, 2.0.4-8ubuntu1.16.04.4+esm2, 2.0.4-8ubuntu1.16.04.4+esm3, 2.0.4-9ubuntu1, 2.0.4-9ubuntu2, 2.0.4-9ubuntu2.1, 2.0.4-9ubuntu2.2, 2.0.4-9ubuntu2.2+esm1, 2.0.4-9ubuntu2.2+esm2, 2.0.6-1ubuntu1, 2.0.6-1ubuntu2, 2.0.7-1ubuntu1, 2.0.7-1ubuntu3, 2.0.7-1ubuntu4, 2.0.7-1ubuntu5, 2.0.7-1ubuntu5.1, 2.0.7-1ubuntu5.2, 2.0.7-1ubuntu5.2+esm1, 2.0.8-6.1ubuntu2, 3.1.1-3, 3.1.1-3ubuntu1, 3.1.1-3ubuntu1.1, 3.1.1-3ubuntu1.2, 3.1.1-3ubuntu1.3, 3.1.1-3ubuntu1.3+esm1, 3.1.1-3ubuntu1.3+esm2, 3.1.1-3ubuntu1.3+esm3, 3.1.1-3ubuntu1.3+esm4, 3.1.1-3ubuntu1.3+esm5, 3.1.1-3ubuntu1.3+esm6, 3.1.2-2, 3.1.2-2.1, 3.1.2-2.1ubuntu1, 3.1.2-2.1ubuntu1.1, 3.1.2-2.1ubuntu1.2, 3.1.2-2.1ubuntu1.3, 3.1.2-2.1ubuntu1.4, 3.1.2-2.1ubuntu1.5, 3.1.2-2.1ubuntu1.6, 3.1.2-2.1ubuntu1.6+esm1, 3.1.2-2.1ubuntu1.6+esm2, 3.1.2-2.1ubuntu1.6+esm3, 3.1.2-2.1ubuntu1.6+esm4, 3.1.3-6, 3.1.3-8, 3.1.3-8ubuntu0.1, 3.1.3-8ubuntu0.2, 3.1.3-8ubuntu0.3, 3.1.3-8ubuntu0.4, 3.1.3-8ubuntu0.5, 3.1.3-8ubuntu0.7, 3.1.3-8ubuntu0.8, 3.1.3-8ubuntu0.9, 3.1.3-8ubuntu0.9+esm1, 3.1.3-8ubuntu0.9+esm2
- Fixed versions
- 1:1.3.dfsg+really1.3.1-1ubuntu3.2, 1:1.3.dfsg+really1.3.2-3ubuntu1.1, 1:1.3.dfsg-3.1ubuntu2.3
- CVEs
- CVE-2026-85091
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 20:48 UTC · Revision 1
Source evidence
zlib versions 1.3.1.2 through 1.3.2 contain a heap buffer overflow vulnerability in the gz_vacate() function when processing non-blocking gzwrite() operations with stale external buffer pointers. Attackers can trigger the overflow by calling gzprintf() or gzvprintf() after a write stall, causing an unchecked memmove() to write beyond the internal input buffer boundary.
osv:UBUNTU-CVE-2026-85091
klibc
Fixed versions: Not specified
zlib
Fixed versions: Not specified
klibc
Fixed versions: Not specified
rsync
Fixed versions: Not specified
zlib
Fixed versions: Not specified
zsync
Fixed versions: Not specified
klibc
Fixed versions: Not specified
rsync
Fixed versions: Not specified
zlib
Fixed versions: Not specified
zsync
Fixed versions: Not specified
klibc
Fixed versions: Not specified
rsync
Fixed versions: Not specified
zlib
Fixed versions: Not specified
zsync
Fixed versions: Not specified
klibc
Fixed versions: Not specified
zlib
Fixed versions: Not specified
zsync
Fixed versions: Not specified
klibc
Fixed versions: Not specified
zlib
Fixed versions: 1:1.3.dfsg-3.1ubuntu2.3
zsync
Fixed versions: Not specified
klibc
Fixed versions: Not specified
zlib
Fixed versions: 1:1.3.dfsg+really1.3.2-3ubuntu1.1
zsync
Fixed versions: Not specified
klibc
Fixed versions: Not specified
zlib
Fixed versions: 1:1.3.dfsg+really1.3.1-1ubuntu3.2
zsync
Fixed versions: Not specified
Complete source record
{
"id": "6f5f0cfd2fa7f3784e3f6bdb5f3def568deda81ba816ef2c9e4c5b4530907541",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-85091",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-85091",
"summary": "zlib versions 1.3.1.2 through 1.3.2 contain a heap buffer overflow vulnerability in the gz_vacate() function when processing non-blocking gzwrite() operations with stale external buffer pointers. Attackers can trigger the overflow by calling gzprintf() or gzvprintf() after a write stall, causing an unchecked memmove() to write beyond the internal input buffer boundary.",
"evidence": "osv:UBUNTU-CVE-2026-85091",
"products": [
{
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"evidence": "/affected/0/package/name"
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"affected_versions": [
{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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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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{
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{
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{
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{
"name": {
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{
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"evidence": "/affected/2/versions"
},
{
"value": "2.0.4-4",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.4-6",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.4-7",
"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
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{
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{
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{
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"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
},
{
"value": "2.0.4-8ubuntu1.16.04.4+esm3",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "rsync",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.1.1-3",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.1-3ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.1-3ubuntu1.1",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.1-3ubuntu1.2",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.1-3ubuntu1.3",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.1-3ubuntu1.3+esm1",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.1-3ubuntu1.3+esm2",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.1-3ubuntu1.3+esm3",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.1-3ubuntu1.3+esm4",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.1-3ubuntu1.3+esm5",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.1-3ubuntu1.3+esm6",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "zlib",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.2.8.dfsg-2ubuntu4",
"evidence": "/affected/4/versions"
},
{
"value": "1:1.2.8.dfsg-2ubuntu4.1",
"evidence": "/affected/4/versions"
},
{
"value": "1:1.2.8.dfsg-2ubuntu4.3",
"evidence": "/affected/4/versions"
},
{
"value": "1:1.2.8.dfsg-2ubuntu4.3+esm1",
"evidence": "/affected/4/versions"
},
{
"value": "1:1.2.8.dfsg-2ubuntu4.3+esm2",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "zsync",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.6.2-1ubuntu1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "klibc",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.0.4-9ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "2.0.4-9ubuntu2",
"evidence": "/affected/6/versions"
},
{
"value": "2.0.4-9ubuntu2.1",
"evidence": "/affected/6/versions"
},
{
"value": "2.0.4-9ubuntu2.2",
"evidence": "/affected/6/versions"
},
{
"value": "2.0.4-9ubuntu2.2+esm1",
"evidence": "/affected/6/versions"
},
{
"value": "2.0.4-9ubuntu2.2+esm2",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "rsync",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.1.2-2",
"evidence": "/affected/7/versions"
},
{
"value": "3.1.2-2.1",
"evidence": "/affected/7/versions"
},
{
"value": "3.1.2-2.1ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "3.1.2-2.1ubuntu1.1",
"evidence": "/affected/7/versions"
},
{
"value": "3.1.2-2.1ubuntu1.2",
"evidence": "/affected/7/versions"
},
{
"value": "3.1.2-2.1ubuntu1.3",
"evidence": "/affected/7/versions"
},
{
"value": "3.1.2-2.1ubuntu1.4",
"evidence": "/affected/7/versions"
},
{
"value": "3.1.2-2.1ubuntu1.5",
"evidence": "/affected/7/versions"
},
{
"value": "3.1.2-2.1ubuntu1.6",
"evidence": "/affected/7/versions"
},
{
"value": "3.1.2-2.1ubuntu1.6+esm1",
"evidence": "/affected/7/versions"
},
{
"value": "3.1.2-2.1ubuntu1.6+esm2",
"evidence": "/affected/7/versions"
},
{
"value": "3.1.2-2.1ubuntu1.6+esm3",
"evidence": "/affected/7/versions"
},
{
"value": "3.1.2-2.1ubuntu1.6+esm4",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "zlib",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.2.11.dfsg-0ubuntu2",
"evidence": "/affected/8/versions"
},
{
"value": "1:1.2.11.dfsg-0ubuntu2.1",
"evidence": "/affected/8/versions"
},
{
"value": "1:1.2.11.dfsg-0ubuntu2.2",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
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"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.6.2-2ubuntu1",
"evidence": "/affected/9/versions"
},
{
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}
]
},
{
"name": {
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},
"prerequisites": [],
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"affected_versions": [
{
"value": "2.0.6-1ubuntu1",
"evidence": "/affected/10/versions"
},
{
"value": "2.0.6-1ubuntu2",
"evidence": "/affected/10/versions"
},
{
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"evidence": "/affected/10/versions"
},
{
"value": "2.0.7-1ubuntu3",
"evidence": "/affected/10/versions"
},
{
"value": "2.0.7-1ubuntu4",
"evidence": "/affected/10/versions"
},
{
"value": "2.0.7-1ubuntu5",
"evidence": "/affected/10/versions"
},
{
"value": "2.0.7-1ubuntu5.1",
"evidence": "/affected/10/versions"
},
{
"value": "2.0.7-1ubuntu5.2",
"evidence": "/affected/10/versions"
},
{
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"evidence": "/affected/10/versions"
}
]
},
{
"name": {
"value": "rsync",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.1.3-6",
"evidence": "/affected/11/versions"
},
{
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"evidence": "/affected/11/versions"
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{
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},
{
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},
{
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},
{
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"evidence": "/affected/11/versions"
},
{
"value": "3.1.3-8ubuntu0.5",
"evidence": "/affected/11/versions"
},
{
"value": "3.1.3-8ubuntu0.7",
"evidence": "/affected/11/versions"
},
{
"value": "3.1.3-8ubuntu0.8",
"evidence": "/affected/11/versions"
},
{
"value": "3.1.3-8ubuntu0.9",
"evidence": "/affected/11/versions"
},
{
"value": "3.1.3-8ubuntu0.9+esm1",
"evidence": "/affected/11/versions"
},
{
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}
]
},
{
"name": {
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},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.2.11.dfsg-1ubuntu3",
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},
{
"value": "1:1.2.11.dfsg-2ubuntu1",
"evidence": "/affected/12/versions"
},
{
"value": "1:1.2.11.dfsg-2ubuntu1.1",
"evidence": "/affected/12/versions"
},
{
"value": "1:1.2.11.dfsg-2ubuntu1.2",
"evidence": "/affected/12/versions"
},
{
"value": "1:1.2.11.dfsg-2ubuntu1.3",
"evidence": "/affected/12/versions"
},
{
"value": "1:1.2.11.dfsg-2ubuntu1.4",
"evidence": "/affected/12/versions"
},
{
"value": "1:1.2.11.dfsg-2ubuntu1.5",
"evidence": "/affected/12/versions"
}
]
},
{
"name": {
"value": "zsync",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.6.2-3ubuntu1",
"evidence": "/affected/13/versions"
}
]
},
{
"name": {
"value": "klibc",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.0.8-6.1ubuntu2",
"evidence": "/affected/14/versions"
},
{
"value": "2.0.10-3",
"evidence": "/affected/14/versions"
},
{
"value": "2.0.10-4",
"evidence": "/affected/14/versions"
},
{
"value": "2.0.10-4ubuntu0.1",
"evidence": "/affected/14/versions"
},
{
"value": "2.0.10-4ubuntu0.2",
"evidence": "/affected/14/versions"
}
]
},
{
"name": {
"value": "zlib",
"evidence": "/affected/15/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.2.11.dfsg-2ubuntu7",
"evidence": "/affected/15/versions"
},
{
"value": "1:1.2.11.dfsg-2ubuntu9",
"evidence": "/affected/15/versions"
},
{
"value": "1:1.2.11.dfsg-2ubuntu9.1",
"evidence": "/affected/15/versions"
},
{
"value": "1:1.2.11.dfsg-2ubuntu9.2",
"evidence": "/affected/15/versions"
}
]
},
{
"name": {
"value": "zsync",
"evidence": "/affected/16/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.6.2-3ubuntu1",
"evidence": "/affected/16/versions"
}
]
},
{
"name": {
"value": "klibc",
"evidence": "/affected/17/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.0.13-1",
"evidence": "/affected/17/versions"
},
{
"value": "2.0.13-2",
"evidence": "/affected/17/versions"
},
{
"value": "2.0.13-2ubuntu1",
"evidence": "/affected/17/versions"
},
{
"value": "2.0.13-4",
"evidence": "/affected/17/versions"
},
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"https://gist.github.com/thesmartshadow/e0b9481792afb7c31e86fee1ff084490",
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"published_at": "2026-09-03T13:06:00+00:00"
}