#VU124259 Out-of-bounds read in GNU C Library (glibc) - CVE-2026-4437
Published: March 23, 2026
Vulnerability identifier: #VU124259
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L/E:U/U:Green
CVE-ID: CVE-2026-4437
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
GNU C Library (glibc)
GNU C Library (glibc)
Software vendor:
GNU
GNU
Description
The vulnerability allows a remote attacker to perform a spoofing attack.
The vulnerability exists due to a boundary condition when calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C Library version. A remote attacker can send a specially crafted response from the configured DNS server and perform a spoofing attack.
Remediation
Install updates from vendor's website.