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CVE-2026-4438

ADVISORY - ubuntu

Summary

Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C library version 2.34 to version 2.43 could result in an invalid DNS hostname being returned to the caller in violation of the DNS specification.

EPSS Score⁠: 0.00066 (0.206)

Common Weakness Enumeration (CWE)

ADVISORY - nist

CWE-20⁠

Improper Input Validation

CWE-88⁠

Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

Impacted images

Advisories

Ubuntu

CREATED

UPDATED

ADVISORY IDCVE-2026-4438⁠
EXPLOITABILITY SCORE

-

EXPLOITS FOUND
-
COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

N/Amedium
PackageTypeOS NameOS VersionAffected RangesFix Versions
ubuntu/glibcdebubuntu24.04>=0Not yet available

Severity and metrics

No CVSS data available from this advisory.

NIST

CREATED

UPDATED

ADVISORY IDCVE-2026-4438⁠
EXPLOITABILITY SCORE

2.8

EXPLOITS FOUND
COMMON WEAKNESS ENUMERATION (CWE)
CWE-20⁠CWE-88⁠

CVSS SCORE

5.4medium

Debian

CREATED

UPDATED

ADVISORY IDCVE-2026-4438⁠
EXPLOITABILITY SCORE

-

EXPLOITS FOUND
-
COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

N/Alow

Rocky

CREATED

UPDATED

ADVISORY IDRLSA-2026:19061⁠
EXPLOITABILITY SCORE

-

EXPLOITS FOUND
-
COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

N/Alow

Rocky

CREATED

UPDATED

ADVISORY IDRLSA-2026:20597⁠
EXPLOITABILITY SCORE

-

EXPLOITS FOUND
-
COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

N/Alow

Chainguard

CREATED

UPDATED

ADVISORY ID

CGA-6448-55wg-5294

EXPLOITABILITY SCORE

-

EXPLOITS FOUND
-
COMMON WEAKNESS ENUMERATION (CWE)-
RATING UNAVAILABLE FROM ADVISORY

Photon

CREATED

UPDATED

ADVISORY ID

CVE-2026-4438

EXPLOITABILITY SCORE

-

EXPLOITS FOUND
-
COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

5.4medium

minimos

CREATED

UPDATED

ADVISORY ID

MINI-23p3-qw4q-3336

EXPLOITABILITY SCORE

-

EXPLOITS FOUND
-
COMMON WEAKNESS ENUMERATION (CWE)-
RATING UNAVAILABLE FROM ADVISORY