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    CVE-2026-4437

    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, with a crafted response from the configured DNS server, result in a violation of the DNS specification that causes the application to treat a non-answer section of the DNS response as a valid answer.

    Published:Mar 20, 2026
    Last Modified:Apr 8, 2026
    EPS:Mar 20, 2026
    EPSS Score:0.00046
    CVSS Score:7.5

    Affected Products

    Vendor
    Gnu
    Product
    Glibc
    Vendor
    The Gnu C Library
    Product
    Glibc

    Exploits

    https://sourceware.org/bugzilla/show_bug.cgi?id=34014

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers
    CAPEC-66 SQL Injection
    CAPEC-676 NoSQL Injection

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High