Vulnerability-Lookup

GHSA-7687-3V4J-49FR

Vulnerability from github – Published: 2026-01-07 21:31 – Updated: 2026-01-07 21:31

Details

zlib versions up to and including 1.3.1.2 contain a global buffer overflow in the untgz utility. The TGZfname() function copies an attacker-supplied archive name from argv[] into a fixed-size 1024-byte static global buffer using an unbounded strcpy() call without length validation. Supplying an archive name longer than 1024 bytes results in an out-of-bounds write that can lead to memory corruption, denial of service, and potentially code execution depending on compiler, build flags, architecture, and memory layout. The overflow occurs prior to any archive parsing or validation.

Severity ?

9.3 (Critical)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-22184"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-120"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-07T21:16:01Z",
    "severity": "CRITICAL"
  },
  "details": "zlib versions up to and including 1.3.1.2 contain a global buffer overflow in the untgz utility. The TGZfname() function copies an attacker-supplied archive name from argv[] into a fixed-size 1024-byte static global buffer using an unbounded strcpy() call without length validation. Supplying an archive name longer than 1024 bytes results in an out-of-bounds write that can lead to memory corruption, denial of service, and potentially code execution depending on compiler, build flags, architecture, and memory layout. The overflow occurs prior to any archive parsing or validation.",
  "id": "GHSA-7687-3v4j-49fr",
  "modified": "2026-01-07T21:31:56Z",
  "published": "2026-01-07T21:31:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-22184"
    },
    {
      "type": "WEB",
      "url": "https://github.com/madler/zlib"
    },
    {
      "type": "WEB",
      "url": "https://seclists.org/fulldisclosure/2026/Jan/3"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/zlib-untgz-global-buffer-overflow-in-tgzfname"
    },
    {
      "type": "WEB",
      "url": "https://zlib.net"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-22184 (GCVE-0-2026-22184)

Vulnerability from cvelistv5 – Published: 2026-01-07 20:25 – Updated: 2026-01-07 21:18

Title

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

Summary

Severity ?

9.3 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CWE

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Assigner

VulnCheck

References

URL

Tags

	https://seclists.org/fulldisclosure/2026/Jan/3	technical-descriptionexploit
	https://zlib.net/	product
	https://github.com/madler/zlib	product
	https://www.vulncheck.com/advisories/zlib-untgz-g…	third-party-advisory

Impacted products

	Vendor	Product	Version
	zlib software	zlib	Affected: 0 , ≤ 1.3.1.2 (semver)

Credits

Ron Edgerson

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-7687-3V4J-49FR

CVE-2026-22184 (GCVE-0-2026-22184)

Tags

Sightings

Nomenclature