Out-of-bounds write in Zlib - CVE-2026-22184
Published: February 19, 2026
Vulnerability identifier: #VU123089
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-22184
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error when processing untrusted input within the TGZfname() function. A remote attacker can trick the victim into opening a specially crafted file, trigger an out-of-bounds write and execute arbitrary code on the target system.
Affected software
Zlib
IBM Observability with Instana
Oracle Outside In Technology
Fedora
mingw-zlib
IBM Observability with Instana
Oracle Outside In Technology
Fedora
mingw-zlib
How to mitigate CVE-2026-22184
Install updates from vendor's website.
Zlib - update to 1.3.2
IBM Observability with Instana - update to 1.0.313
mingw-zlib - addressed in versions 1.3.2-1.fc42, 1.3.2-1.fc43
IBM Observability with Instana - update to 1.0.313
mingw-zlib - addressed in versions 1.3.2-1.fc42, 1.3.2-1.fc43