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Zlib CVE-2026-22184

HIGH
Out-of-bounds Write (CWE-787)
2026-01-07 disclosure@vulncheck.com
Buffer Overflow Memory Corruption Zlib Red Hat Suse
7.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative
Red Hat
8.6 HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Patch released
Apr 09, 2026 - 14:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 07, 2026 - 21:16 nvd
HIGH 7.8

DescriptionCVE.org

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.

AnalysisAI

Local privilege escalation in zlib 1.3.1.2 and earlier allows authenticated users to achieve arbitrary code execution through a buffer overflow in the contrib/untgz utility when processing command-line arguments with excessively long archive names. The vulnerability affects only the standalone untgz demonstration tool and does not impact the core zlib library. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Supply excessively long archive name to untgz
Exploit
Overflow fixed-size global buffer
Execution
Write arbitrary data to memory
Impact
Execute code with user privileges
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Vulnerability AssessmentAI

Exploitation Local user account required to execute untgz utility with maliciously crafted command-line argument. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 9.8 (CRITICAL). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker could exploit this flaw, an out-of-bounds write in a fixed-size global buffer.
Remediation Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 7 days: Identify all affected systems and apply vendor patches promptly. …

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.2 Fixed
SUSE Linux Enterprise Micro 5.3 Fixed
SUSE Linux Enterprise Micro 5.4 Fixed

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CVE-2026-22184 vulnerability details – vuln.today
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