Is CVE-2026-4437 actively exploited?

No active exploitation of CVE-2026-4437 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-4437 be exploited remotely?

Yes. CVE-2026-4437 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-4437?

CVE-2026-4437 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-4437

HIGH

CVE-2026-4437

CWE-125Published: March 20, 2026· Updated: Mar 23, 2026

7.5

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:4.7th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-4437 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.