Detections
Analytics
CVE-2026-4437
high
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.
References
https://www.helpnetsecurity.com/2026/05/18/debian-13-5-released/
https://sourceware.org/bugzilla/show_bug.cgi?id=34014
https://cert-portal.siemens.com/productcert/html/ssa-082556.html