CVE-2026-4437

medium

Published 2026-05-26 · Modified 2026-05-26

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

5.5

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.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

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OS impact

OS	Version	Status	Fixed in
rhel	9	fixed
debian	bookworm	fixed	`2.36-9+deb12u14`
debian	bullseye	fixed	`0`
debian	forky	fixed	`2.42-14`
debian	sid	fixed	`2.42-14`
debian	trixie	fixed	`2.41-12+deb13u3`
sles		affected

Application impact

Vendor	Product	Versions	Fixed
google	gcp

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.