CVE-2026-85091
zlib 1.3.1.2 through 1.3.2 Heap Buffer Overflow via gz_vacate
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
zlib 1.3.1.2 through 1.3.2 Heap Buffer Overflow via gz_vacate
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.
- Record
CVE-2026-85091- CVSS 4.0
- 8.3 High
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 - CVSS 3.1
- 7.4 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H - Weakness
- CWE-787
- Updated
- 2026-11-02
EUVDEUVD-2026-70301
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.
- Record
EUVD-2026-70301- CVSS 4.0
- 8.3 High
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-g5fp-32jq-cfw2
zlib versions 1.3.1.2 through 1.3.2 contain a heap buffer overflow vulnerability in the gz_vacate...
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.
- Record
GHSA-g5fp-32jq-cfw2- CVSS 4.0
- 8.3 High
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 3.1
- 7.4 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H - Weakness
- CWE-787
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-85091- CVSS 4.0
- 8.3 High
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 3.1
- 7.4 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H - Weakness
- CWE-787
- Updated
- 2026-11-02
OSVALPINE-CVE-2026-85091
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.
- Record
ALPINE-CVE-2026-85091- CVSS 4.0
- 8.3 High
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 - Updated
- 2026-11-02
OSVBELL-CVE-2026-85091
- Record
BELL-CVE-2026-85091- CVSS 3.1
- 7.4 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H - Updated
- 2026-11-02
Show 17 moreShow less
OSV
zlib 1.3.1.2 through 1.3.2 Heap Buffer Overflow via gz_vacate
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.
- Record
CVE-2026-85091- CVSS 4.0
- 8.3 High
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 - Weakness
- CWE-787
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-85091
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.
- Record
DEBIAN-CVE-2026-85091- CVSS 4.0
- 8.3 High
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 - Updated
- 2026-11-07
OSVUBUNTU-CVE-2026-85091
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.
- Record
UBUNTU-CVE-2026-85091- CVSS 4.0
- 8.3 High
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 - CVSS 3.1
- 7.4 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H - Updated
- 2026-11-06
OSVAZL-99090 No score
CVE-2026-85091 affecting package zlib for versions less than 1.3.2-2
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.
- Record
AZL-99090- Updated
- 2026-11-07
OSVAZL-99174 No score
CVE-2026-85091 affecting package cloud-hypervisor 52.0.152-1
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.
- Record
AZL-99174- Updated
- 2026-11-05
OSVAZL-99234 No score
CVE-2026-85091 affecting package kata-containers 4.1.0.kata1-2
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.
- Record
AZL-99234- Updated
- 2026-11-05
OSVAZL-99276 No score
CVE-2026-85091 affecting package mariadb 10.11.18-1
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.
- Record
AZL-99276- Updated
- 2026-11-02
OSVAZL-99294 No score
CVE-2026-85091 affecting package mysql 8.0.46-1
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.
- Record
AZL-99294- Updated
- 2026-11-02
OSVopenSUSE-SU-2026:12206-1 No score
trivy-0.76.0-1.1 on GA media
These are all security issues fixed in the trivy-0.76.0-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2026:12206-1- Updated
- 2026-11-02
OSVROOT-OS-ALPINE-320-CVE-2026-85091 No score
CVE-2026-85091 in zlib - Patched by Root
Root has patched CVE-2026-85091 in the zlib package for Root:Alpine:3.20. Multiple fixed versions available.
- Record
ROOT-OS-ALPINE-320-CVE-2026-85091- Updated
- 2026-11-02
OSVROOT-OS-ALPINE-321-CVE-2026-85091 No score
CVE-2026-85091 in zlib - Patched by Root
Root has patched CVE-2026-85091 in the zlib package for Root:Alpine:3.21. Multiple fixed versions available.
- Record
ROOT-OS-ALPINE-321-CVE-2026-85091- Updated
- 2026-11-02
OSVROOT-OS-ALPINE-322-CVE-2026-85091 No score
CVE-2026-85091 in zlib - Patched by Root
Root has patched CVE-2026-85091 in the zlib package for Root:Alpine:3.22. Multiple fixed versions available.
- Record
ROOT-OS-ALPINE-322-CVE-2026-85091- Updated
- 2026-11-02
OSVROOT-OS-ALPINE-323-CVE-2026-85091 No score
CVE-2026-85091 in zlib - Patched by Root
Root has patched CVE-2026-85091 in the zlib package for Root:Alpine:3.23. Multiple fixed versions available.
- Record
ROOT-OS-ALPINE-323-CVE-2026-85091- Updated
- 2026-11-02
OSVROOT-OS-ALPINE-324-CVE-2026-85091 No score
CVE-2026-85091 in zlib - Patched by Root
Root has patched CVE-2026-85091 in the zlib package for Root:Alpine:3.24. Multiple fixed versions available.
- Record
ROOT-OS-ALPINE-324-CVE-2026-85091- Updated
- 2026-11-02
OSVROOT-OS-DEBIAN-12-CVE-2026-85091 No score
CVE-2026-85091 in zlib - Patched by Root
Root has patched CVE-2026-85091 in the zlib package for Root:Debian:12. Multiple fixed versions available.
- Record
ROOT-OS-DEBIAN-12-CVE-2026-85091- Updated
- 2026-11-02
OSVROOT-OS-DEBIAN-13-CVE-2026-85091 No score
CVE-2026-85091 in zlib - Patched by Root
Root has patched CVE-2026-85091 in the zlib package for Root:Debian:13. Multiple fixed versions available.
- Record
ROOT-OS-DEBIAN-13-CVE-2026-85091- Updated
- 2026-11-02
OSVUSN-8954-1 No score
zlib vulnerability
Ali Firas discovered that zlib incorrectly handled certain non-blocking write operations. An attacker could possibly use this issue to trigger a heap buffer overflow, resulting in a denial of service or arbitrary code execution.
- Record
USN-8954-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
zlibAlpine:v3.21 |
before 1.3.2-r1 | 1.3.2-r1 |
zlibAlpine:v3.22 |
before 1.3.2-r1 | 1.3.2-r1 |
zlibAlpine:v3.23 |
before 1.3.2-r1 | 1.3.2-r1 |
zlibAlpine:v3.24 |
before 1.3.2-r1 | 1.3.2-r1 |
zlibAzure Linux:3 |
before 1.3.2-2 | 1.3.2-2 |
cloud-hypervisorAzure Linux:3 |
through 52.0.152-1 | None known |
kata-containersAzure Linux:3 |
through 4.1.0.kata1-2 | None known |
mariadbAzure Linux:3 |
through 10.11.18-1 | None known |
mysqlAzure Linux:3 |
through 8.0.46-1 | None known |
zlibAlpaquita:25 |
1.3.1-r2 up to 1.3.2-r1 | 1.3.2-r1 |
Show 36 moreShow less
| Package | Affected | Fixed |
|---|---|---|
zlibAlpaquita:stream |
1.3.1-r0 up to 1.3.2-r1 | 1.3.2-r1 |
zlibBellSoft Hardened Containers:25 |
1.3.1-r2 up to 1.3.2-r1 | 1.3.2-r1 |
zlibBellSoft Hardened Containers:stream |
1.3.1-r0 up to 1.3.2-r1 | 1.3.2-r1 |
zlibDebian:12 |
All versions, plus listed versions 1:1.2.13.dfsg-11:1.2.13.dfsg-21:1.2.13.dfsg-31:1.3.dfsg+really1.3.1-11:1.3.dfsg+really1.3.1-2 Show 10 moreShow less1:1.3.dfsg+really1.3.1-31:1.3.dfsg+really1.3.2-11:1.3.dfsg+really1.3.2-21:1.3.dfsg+really1.3.2-31:1.3.dfsg+really1.3.2-41:1.3.dfsg-11:1.3.dfsg-21:1.3.dfsg-31:1.3.dfsg-3.11:1.3.dfsg-3.1~exp1 |
None known |
zlibDebian:13 |
before 1:1.3.dfsg+really1.3.1-1+deb13u1, plus listed versions 1:1.3.dfsg+really1.3.1-1 |
1:1.3.dfsg+really1.3.1-1+deb13u1 |
zlibDebian:14 |
before 1:1.3.dfsg+really1.3.2-4, plus listed versions 1:1.3.dfsg+really1.3.1-11:1.3.dfsg+really1.3.1-21:1.3.dfsg+really1.3.1-31:1.3.dfsg+really1.3.2-11:1.3.dfsg+really1.3.2-21:1.3.dfsg+really1.3.2-3 |
1:1.3.dfsg+really1.3.2-4 |
zlibRoot:Alpine:3.20 |
before 1.3.2-r00071 | 1.3.2-r000711.3.2-r00072 |
rootio-zlibRoot:Alpine:3.20 |
before 1.3.2-r00071 | 1.3.2-r000711.3.2-r00072 |
zlibRoot:Debian:12 |
before 1:1.2.13.dfsg-1.aikido.6 | 1:1.2.13.dfsg-1.aikido.6 |
rootio-zlibRoot:Debian:12 |
before 1:1.2.13.dfsg-1.aikido.6 | 1:1.2.13.dfsg-1.aikido.6 |
zlibRoot:Debian:13 |
before 1:1.3.dfsg+really1.3.1-1.aikido.6 | 1:1.3.dfsg+really1.3.1-1.aikido.61:1.3.dfsg+really1.3.1-1.aikido.91:1.3.dfsg+really1.3.1-1.aikido.71:1.3.dfsg+really1.3.1-1.aikido.81:1.3.dfsg+really1.3.1-1.aikido.101:1.3.dfsg+really1.3.1-1.aikido.11 |
rootio-zlibRoot:Debian:13 |
before 1:1.3.dfsg+really1.3.1-1.aikido.6 | 1:1.3.dfsg+really1.3.1-1.aikido.61:1.3.dfsg+really1.3.1-1.aikido.91:1.3.dfsg+really1.3.1-1.aikido.71:1.3.dfsg+really1.3.1-1.aikido.81:1.3.dfsg+really1.3.1-1.aikido.101:1.3.dfsg+really1.3.1-1.aikido.11 |
klibcUbuntu:Pro:14.04:LTS |
All versions, plus listed versions 2.0.1-3.1ubuntu22.0.2-1ubuntu12.0.2-1ubuntu22.0.3-0ubuntu12.0.3-0ubuntu1.14.04.1 Show 5 moreShow less2.0.3-0ubuntu1.14.04.22.0.3-0ubuntu1.14.04.32.0.3-0ubuntu1.14.04.3+esm22.0.3-0ubuntu1.14.04.3+esm32.0.3-0ubuntu1.14.04.3+esm4 |
None known |
zlibUbuntu:Pro:14.04:LTS |
All versions, plus listed versions 1:1.2.8.dfsg-1ubuntu11:1.2.8.dfsg-1ubuntu1.11:1.2.8.dfsg-1ubuntu1.1+esm11:1.2.8.dfsg-1ubuntu1.1+esm21:1.2.8.dfsg-1ubuntu1.1+esm3 |
None known |
klibcUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 2.0.3-0ubuntu12.0.4-42.0.4-62.0.4-72.0.4-8 Show 8 moreShow less2.0.4-8ubuntu12.0.4-8ubuntu1.16.04.12.0.4-8ubuntu1.16.04.22.0.4-8ubuntu1.16.04.32.0.4-8ubuntu1.16.04.42.0.4-8ubuntu1.16.04.4+esm12.0.4-8ubuntu1.16.04.4+esm22.0.4-8ubuntu1.16.04.4+esm3 |
None known |
rsyncUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 3.1.1-33.1.1-3ubuntu13.1.1-3ubuntu1.13.1.1-3ubuntu1.23.1.1-3ubuntu1.3 Show 6 moreShow less3.1.1-3ubuntu1.3+esm13.1.1-3ubuntu1.3+esm23.1.1-3ubuntu1.3+esm33.1.1-3ubuntu1.3+esm43.1.1-3ubuntu1.3+esm53.1.1-3ubuntu1.3+esm6 |
None known |
zsyncUbuntu:16.04:LTS |
All versions, plus listed versions 0.6.2-1ubuntu1 |
None known |
klibcUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 2.0.4-9ubuntu12.0.4-9ubuntu22.0.4-9ubuntu2.12.0.4-9ubuntu2.22.0.4-9ubuntu2.2+esm12.0.4-9ubuntu2.2+esm2 |
None known |
rsyncUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 3.1.2-23.1.2-2.13.1.2-2.1ubuntu13.1.2-2.1ubuntu1.13.1.2-2.1ubuntu1.2 Show 8 moreShow less3.1.2-2.1ubuntu1.33.1.2-2.1ubuntu1.43.1.2-2.1ubuntu1.53.1.2-2.1ubuntu1.63.1.2-2.1ubuntu1.6+esm13.1.2-2.1ubuntu1.6+esm23.1.2-2.1ubuntu1.6+esm33.1.2-2.1ubuntu1.6+esm4 |
None known |
zsyncUbuntu:18.04:LTS |
All versions, plus listed versions 0.6.2-2ubuntu10.6.2-3ubuntu1 |
None known |
klibcUbuntu:Pro:20.04:LTS |
All versions, plus listed versions 2.0.6-1ubuntu12.0.6-1ubuntu22.0.7-1ubuntu12.0.7-1ubuntu32.0.7-1ubuntu4 Show 4 moreShow less2.0.7-1ubuntu52.0.7-1ubuntu5.12.0.7-1ubuntu5.22.0.7-1ubuntu5.2+esm1 |
None known |
rsyncUbuntu:Pro:20.04:LTS |
All versions, plus listed versions 3.1.3-63.1.3-83.1.3-8ubuntu0.13.1.3-8ubuntu0.23.1.3-8ubuntu0.3 Show 7 moreShow less3.1.3-8ubuntu0.43.1.3-8ubuntu0.53.1.3-8ubuntu0.73.1.3-8ubuntu0.83.1.3-8ubuntu0.93.1.3-8ubuntu0.9+esm13.1.3-8ubuntu0.9+esm2 |
None known |
zsyncUbuntu:20.04:LTS |
All versions, plus listed versions 0.6.2-3ubuntu1 |
None known |
klibcUbuntu:22.04:LTS |
All versions, plus listed versions 2.0.8-6.1ubuntu22.0.10-32.0.10-42.0.10-4ubuntu0.12.0.10-4ubuntu0.2 |
None known |
zlibUbuntu:22.04:LTS |
All versions, plus listed versions 1:1.2.11.dfsg-2ubuntu71:1.2.11.dfsg-2ubuntu91:1.2.11.dfsg-2ubuntu9.11:1.2.11.dfsg-2ubuntu9.2 |
None known |
zsyncUbuntu:22.04:LTS |
All versions, plus listed versions 0.6.2-3ubuntu1 |
None known |
klibcUbuntu:24.04:LTS |
All versions, plus listed versions 2.0.13-12.0.13-22.0.13-2ubuntu12.0.13-42.0.13-4ubuntu0.12.0.13-4ubuntu0.2 |
None known |
zlibUbuntu:24.04:LTS |
before 1:1.3.dfsg-3.1ubuntu2.3, plus listed versions 1:1.2.13.dfsg-1ubuntu51:1.3.dfsg-3ubuntu11:1.3.dfsg-3.1ubuntu11:1.3.dfsg-3.1ubuntu21:1.3.dfsg-3.1ubuntu2.11:1.3.dfsg-3.1ubuntu2.2 |
1:1.3.dfsg-3.1ubuntu2.3 |
zsyncUbuntu:24.04:LTS |
All versions, plus listed versions 0.6.2-50.6.2-5build1 |
None known |
klibcUbuntu:26.10 |
All versions, plus listed versions 2.0.14-1ubuntu2 |
None known |
zlibUbuntu:26.10 |
before 1:1.3.dfsg+really1.3.2-3ubuntu1.1, plus listed versions 1:1.3.dfsg+really1.3.1-1ubuntu31:1.3.dfsg+really1.3.2-3ubuntu1 |
1:1.3.dfsg+really1.3.2-3ubuntu1.1 |
zsyncUbuntu:26.10 |
All versions, plus listed versions 0.6.2-90.6.3-2 |
None known |
klibcUbuntu:26.04:LTS |
All versions, plus listed versions 2.0.14-1ubuntu12.0.14-1ubuntu2 |
None known |
zlibUbuntu:26.04:LTS |
before 1:1.3.dfsg+really1.3.1-1ubuntu3.2, plus listed versions 1:1.3.dfsg+really1.3.1-1ubuntu21:1.3.dfsg+really1.3.1-1ubuntu31:1.3.dfsg+really1.3.1-1ubuntu3.1 |
1:1.3.dfsg+really1.3.1-1ubuntu3.2 |
zsyncUbuntu:26.04:LTS |
All versions, plus listed versions 0.6.2-80.6.2-9 |
None known |
trivyopenSUSE:Tumbleweed From an advisory covering 2 CVEs |
before 0.76.0-1.1 | 0.76.0-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | OSV | |
| affected | OSV | |
| affected | OSV | |
| affected | OSV | |
| affected | ||
| facts | OSV | |
| affected | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-85091 is a high vulnerability (CVSS 8.3) in Ruby Zlib, published September 3, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.47%, the 40th percentile. Fixed in zlib 1.3.2-r1.
References
gist.github.com/thesmartshadow/e0b9481792afb7c31e86fee1ff084490
github.com/madler/zlib/blob/v1.3.2/gzwrite.c
vulncheck.com/advisories/zlib-1.3.1.2-through-1.3.2-heap-buffer-overflow-via-gz-vacate
nvd.nist.gov/vuln/detail/CVE-2026-85091
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security.alpinelinux.org/vuln/CVE-2026-85091
docs.bell-sw.com/security/cves/CVE-2026-85091
security-tracker.debian.org/tracker/CVE-2026-85091
ubuntu.com/security/CVE-2026-85091
cve.org/CVERecord?id=CVE-2026-85091
suse.com/security/cve/CVE-2026-78669