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Fencer Vulns
high 7.5

CVE-2026-41992 json

Global Buffer Overflow in GNU gzip

published 2026-06-29 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-40069 , GHSA-qxh4-rprf-2mmj , JLSEC-2026-1265

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

GNU gzip contains a global buffer overflow vulnerability in the LZH decompression logic caused by improper reuse of shared global state between different decompression formats within a single execution. GNU gzip maintains a global array that is shared across the LZ77, LZW, and LZH decompression routines and is not reinitialized between files processed in the same invocation. By decompressing a specially crafted LZW file followed by a specially crafted LZH file in a single gzip -d command, an attacker can poison the shared global state and subsequently trigger an out‑of‑bounds read in the LZH decoder. The LZH decompression logic follows stale values left in the shared array, causing reads past the end of the allocated global buffer.

This issue has been fixed in commits 63dbf6b3b9e6e781df1a6a64e609b10e23969681 and e7378c2d421be6a286922374425680bbe9ad8b7d.

Patch / fix

  • gzip Debian 13 1.13-1+deb13u1
  • gzip Debian 14 1.14-1

debian advisories DEBIAN-CVE-2026-41992

  • gzip Ubuntu 22.04 LTS 1.10-4ubuntu4.2
  • gzip Ubuntu 24.04 LTS 1.12-1ubuntu3.2
  • gzip Ubuntu 26.04 LTS 1.14-1~exp2ubuntu1.1
  • gzip Ubuntu Pro 14.04 LTS 1.6-3ubuntu1+esm2
  • gzip Ubuntu Pro 16.04 LTS 1.6-4ubuntu1+esm2
  • gzip Ubuntu Pro 18.04 LTS 1.6-5ubuntu1.2+esm1
  • gzip Ubuntu Pro 20.04 LTS 1.10-0ubuntu4.1+esm1

ubuntu advisories UBUNTU-CVE-2026-41992

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • gzip hummingbird 1 1.15-1.hum1
  • gzip RHEL 8 1.9-15.el8_10
  • gzip hummingbird 1 1.14-2.3.hum1
  • gzip RHEL 10.2 1.13-4.el10_2
  • gzip RHEL 9 1.12-2.el9_8

red hat advisories RHSA-2026:79717RHSA-2026:65998RHSA-2026:37764RHSA-2026:61625RHSA-2026:61623

  • gzip Linux Micro 6.0 1.13-3.1
  • gzip Linux Micro 6.1 1.13-slfo.1.1_4.1
  • gzip SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.13-160000.4.1
  • gzip SLE Module for Basesystem 15 SP7, SLE Micro 5.5, SLE Micro 5.4 +1 more 1.10-150200.16.1
  • gzip SLES LTSS Extended Security 12 SP5 1.10-4.20.1

suse advisories SUSE-SU-2026:23363-1SUSE-SU-2026:23356-1SUSE-SU-2026:23392-1SUSE-SU-2026:23550-1SUSE-SU-2026:3592-1SUSE-SU-2026:3590-1

  • gzip openSUSE Leap 16.0 1.13-160000.4.1
  • gzip openSUSE Tumbleweed 1.14-3.1

opensuse advisories openSUSE-SU-2026:21666-1openSUSE-SU-2026:11518-1

  • gzip AlmaLinux 8 1.9-15.el8_10
  • gzip AlmaLinux 9 1.12-2.el9_8
  • gzip AlmaLinux 10 1.13-4.el10_2

almalinux advisories ALSA-2026:65998ALSA-2026:61623ALSA-2026:61625

  • gzip Rocky Linux 8 1.9-15.el8_10
  • gzip Rocky Linux 10 1.13-4.el10_2
  • gzip Rocky Linux 9 1.12-2.el9_8

rocky linux advisories RLSA-2026:65998RLSA-2026:61625RLSA-2026:61623

  • gzip Alpine 3.21 1.13-r1
  • gzip Alpine 3.22 1.14-r2
  • gzip Alpine 3.24, Alpine 3.23 1.14-r3

alpine advisories ALPINE-CVE-2026-41992

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • gzip Azure Linux 3.0 1.13-2

azure linux advisories AZL-91406

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-41992 updated cvss 3.6

gzip: gzip: Information disclosure via global buffer overflow in LZH decompression

  • Red Hat Enterprise Linux 6 gzip Red Hat Enterprise Linux 7 gzip Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Dev Spaces devspaces/code-sshd-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Discovery 2 discovery/discovery-server-rhel9 1788205779
    fixed: vendor fix RHSA-2026:61783
  • Red Hat Enterprise Linux BaseOS (v. 8) gzip 1.9-15.el8_10
    fixed: vendor fix RHSA-2026:65998
  • Red Hat Enterprise Linux BaseOS (v. 9) gzip 1.12-2.el9_8
    fixed: vendor fix RHSA-2026:61623
  • Red Hat Enterprise Linux BaseOS (v. 10) gzip 1.13-4.el10_2
    fixed: vendor fix RHSA-2026:61625
  • Red Hat Hardened Images gzip 1.15-1.hum1, gzip 1.14-2.3.hum1
    fixed: vendor fix RHSA-2026:37764
  • Red Hat Update Infrastructure 5 rhui5/cds-rhel9 1788880464, rhui5/rhua-rhel9 1788880581, rhui5/haproxy-rhel9 1788880456, rhui5/installer-rhel9 1788765051, rhui5/cds-kubernetes-rhel9 1788880445
    fixed: vendor fix RHSA-2026:66018
  • Red Hat Discovery 2 discovery/discovery-ui-rhel9 1788206196
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.62% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.9 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA 4.0 6.9 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
julia Gzip_jll
all versions
 no fix listed

Affected products

  • GNU gzip

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.