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Fencer Vulns
high 8.6

CVE-2026-22184 json

zlib <= 1.3.1.2 untgz Global Buffer Overflow in TGZfname()

published 2026-01-07 10 mo ago modified 2026-09-01 2 mo ago also EUVD-2026-1173

cvss
8.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

zlib versions up to and including 1.3.1.2 include a global buffer overflow in the untgz utility located under contrib/untgz. The vulnerability is limited to the standalone demonstration utility and does not affect the core zlib compression library. The flaw occurs when a user executes the untgz command with an excessively long archive name supplied via the command line, leading to an out-of-bounds write in a fixed-size global buffer.

Patch / fix

  • zlib Debian 14, Debian 13, Debian 12 1:1.2.6.dfsg-1

debian advisories DEBIAN-CVE-2026-22184

  • zlib Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 1.3.2-r0

alpine advisories ALPINE-CVE-2026-22184

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

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-2026-22184 updated cvss 8.6

zlib: zlib: Arbitrary code execution via buffer overflow in untgz utility

  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/fluentd-rhel9, openshift-logging/kibana6-rhel8, openshift-logging/elasticsearch6-rhel9, openshift-logging/logging-curator5-rhel9, openshift-logging/elasticsearch-proxy-rhel9, openshift-logging/elasticsearch-rhel9-operator, +1 more Red Hat Enterprise Linux 8 mingw-zlib, mingw32-zlib, mingw64-zlib Red Hat Enterprise Linux 9 mingw-zlib, mingw32-zlib, mingw64-zlib Red Hat Enterprise Linux 10 mingw-zlib, mingw32-zlib, mingw64-zlib
    affected: workaround, no fix planned “Will not fix”
  • Red Hat build of OpenJDK 1.8 java-1.8.0-openjdk-portable Red Hat build of OpenJDK 11 ELS java-11-openjdk, java-11-openjdk-portable, java-21-openjdk-portable Red Hat build of OpenJDK 17 java-17-openjdk-portable, java-21-openjdk-portable Red Hat build of OpenJDK 21 java-21-openjdk-portable, java-21-openjdk-portable-rhel7 Red Hat build of OpenJDK 25 java-21-openjdk-vanilla, java-25-openjdk-portable Red Hat Enterprise Linux 6 zlib, minizip
    +4 more products
    Red Hat Enterprise Linux 7 zlib, minizip Red Hat Enterprise Linux 8 npm, zlib, mecab, mysql, rsync, nodejs, +78 more Red Hat Enterprise Linux 9 npm, zlib, mysql, rsync, nodejs, mysql-libs, +94 more Red Hat Enterprise Linux 10 rsync, thunderbird, java-21-openjdk, java-25-openjdk
    not affected: vulnerable code not present
  • Red Hat JBoss Core Services zlib
    not affected: vulnerable code cannot be controlled by adversary
  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present
  • Red Hat OpenStack Platform 16.2 rhosp-rhel8/openstack-base, rhosp-rhel8/openstack-cron, rhosp-rhel8/openstack-etcd, rhosp-rhel8/openstack-redis, rhosp-rhel8/openstack-iscsid, rhosp-rhel8/openstack-ec2-api, +106 more Red Hat OpenStack Platform 17.1 rhosp-rhel8/openstack-base, rhosp-rhel8/openstack-collectd, rhosp-rhel8/openstack-nova-base, rhosp-rhel8/openstack-dependencies, rhosp-rhel8/openstack-nova-libvirt, rhosp-rhel8/openstack-tripleoclient
    not affected: component 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 ICSA-26-202-06 updated cvss 0.0

Siemens CADRA

  • Siemens CADRA
    affected: no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
10 mo ago

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • seclists.org https://seclists.org/fulldisclosure/2026/Jan/3 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 4.6 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
CISA ADP 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
CNA 4.0 4.6 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/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 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Affected products

  • zlib software zlib
  • Red Hat Logging Subsystem for Red Hat OpenShift
  • Red Hat Red Hat build of OpenJDK 11 ELS
  • Red Hat Red Hat build of OpenJDK 17
  • Red Hat Red Hat build of OpenJDK 1.8
  • Red Hat Red Hat build of OpenJDK 21
  • Red Hat Red Hat build of OpenJDK 25
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat JBoss Core Services
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenStack Platform 16.2
  • Red Hat Red Hat OpenStack Platform 17.1
  • Siemens CADRA

Classification

Weakness
  • CWE-787 Out-of-bounds Write
  • CWE-120 Buffer Copy without Checking Size of Input

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Modified CPE configuration to specify affected component as untgz rather than zlib itself.