DEBIAN-CVE-2026-85091

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Source
https://security-tracker.debian.org/tracker/CVE-2026-85091
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-85091.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-85091
Upstream
Published
2026-09-03T13:06:20Z
Modified
2026-09-10T08:47:28Z
Severity
  • 8.3 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/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 CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Debian:12 / zlib

Package

Name
zlib
Purl
pkg:deb/debian/zlib?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:1.*
1:1.2.13.dfsg-1
1:1.2.13.dfsg-2
1:1.2.13.dfsg-3
1:1.3.dfsg-1
1:1.3.dfsg-2
1:1.3.dfsg-3
1:1.3.dfsg-3.1~exp1
1:1.3.dfsg-3.1
1:1.3.dfsg+really1.3.1-1
1:1.3.dfsg+really1.3.1-2
1:1.3.dfsg+really1.3.1-3
1:1.3.dfsg+really1.3.2-1
1:1.3.dfsg+really1.3.2-2
1:1.3.dfsg+really1.3.2-3

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-85091.json"

Debian:13 / zlib

Package

Name
zlib
Purl
pkg:deb/debian/zlib?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:1.*
1:1.3.dfsg+really1.3.1-1
1:1.3.dfsg+really1.3.1-2
1:1.3.dfsg+really1.3.1-3
1:1.3.dfsg+really1.3.2-1
1:1.3.dfsg+really1.3.2-2
1:1.3.dfsg+really1.3.2-3

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-85091.json"

Debian:14 / zlib

Package

Name
zlib
Purl
pkg:deb/debian/zlib?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:1.*
1:1.3.dfsg+really1.3.1-1
1:1.3.dfsg+really1.3.1-2
1:1.3.dfsg+really1.3.1-3
1:1.3.dfsg+really1.3.2-1
1:1.3.dfsg+really1.3.2-2
1:1.3.dfsg+really1.3.2-3

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-85091.json"