CVE-2026-22184

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.

Affected Software

Weaknesses

• CWE-787: CWE-787 Out-of-bounds Write

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: total

CVE Program Container

Additional References

• https://github.com/madler/zlib/issues/1142

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

Additional References

• https://access.redhat.com/security/cve/CVE-2026-22184
• https://bugzilla.redhat.com/show_bug.cgi?id=2427688
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22184.json

References

• https://seclists.org/fulldisclosure/2026/Jan/3
• https://zlib.net/
• https://github.com/madler/zlib
• https://www.vulncheck.com/advisories/zlib-untgz-global-buffer-overflow-in-tgzfname

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