Vulnerability DatabaseCVE-2026-4438
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CVE-2026-4438
Published:March 20, 2026
Updated:July 21, 2026
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.
Related Resources (2)
https://sourceware.org/bugzilla/show_bug.cgi?id=34015
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
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CVSS v4
Base Score:
5.3
Attack Vector
ADJACENT
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.4
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Input Validation
CWE-20
Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
CWE-88
EPSS
Base Score:
0.21