CVE-2026-22184

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.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/madler/zlib	Product
https://seclists.org/fulldisclosure/2026/Jan/3	Mailing List Third Party Advisory
https://www.vulncheck.com/advisories/zlib-untgz-global-buffer-overflow-in-tgzfname	Third Party Advisory
https://zlib.net/	Product
https://github.com/madler/zlib/issues/1142	Issue Tracking
https://access.redhat.com/security/cve/CVE-2026-22184
https://bugzilla.redhat.com/show_bug.cgi?id=2427688
https://cert-portal.siemens.com/productcert/html/ssa-470355.html
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22184.json

Configurations

Configuration 1 (hide)

cpe:2.3:a:zlib:zlib:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-01-07 21:16

Updated : 2026-09-01 13:18

NVD link : CVE-2026-22184

Mitre link : CVE-2026-22184

CVE.ORG link : CVE-2026-22184

JSON object : View

Products Affected

zlib

zlib

CWE

CWE-787

Out-of-bounds Write

CWE-120

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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"defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:openstack:17.1"], "vendor": "Red Hat", "product": "Red Hat OpenStack Platform 17.1", "packageName": "rhosp-rhel8/openstack-tripleoclient", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}]}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "affectedData": [{"vendor": "Siemens", "product": "CADRA", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}]}], "published": "2026-01-07T21:16:01.563", "references": [{"url": "https://github.com/madler/zlib", "tags": ["Product"], "source": "disclosure@vulncheck.com"}, {"url": "https://seclists.org/fulldisclosure/2026/Jan/3", "tags": ["Mailing List", "Third Party Advisory"], "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/zlib-untgz-global-buffer-overflow-in-tgzfname", "tags": ["Third Party Advisory"], "source": "disclosure@vulncheck.com"}, {"url": "https://zlib.net/", "tags": ["Product"], "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/madler/zlib/issues/1142", "tags": ["Issue Tracking"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-22184", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2427688", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://cert-portal.siemens.com/productcert/html/ssa-470355.html", "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}, {"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22184.json", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-787"}]}, {"type": "Secondary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-787"}]}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "description": [{"lang": "en", "value": "CWE-120"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Las versiones de zlib hasta la 1.3.1.2 inclusive incluyen un desbordamiento de b\u00fafer global en la utilidad untgz ubicada en contrib/untgz. La vulnerabilidad se limita a la utilidad de demostraci\u00f3n independiente y no afecta a la biblioteca de compresi\u00f3n central de zlib. El fallo ocurre cuando un usuario ejecuta el comando untgz con un nombre de archivo excesivamente largo suministrado a trav\u00e9s de la l\u00ednea de comandos, lo que lleva a una escritura fuera de l\u00edmites en un b\u00fafer global de tama\u00f1o fijo."}], "lastModified": "2026-09-01T13:18:19.867", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:zlib:zlib:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5B9F9582-7F4A-4376-BE97-6AB4038AEBB4", "versionEndIncluding": "1.3.1.2"}], "operator": "OR"}]}], "sourceIdentifier": "disclosure@vulncheck.com"}