What is GHSA-m5wq-r4r4-4qrh?

GHSA-m5wq-r4r4-4qrh is a security advisory published by GitHub Security Advisories with High severity. Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the...

Which CVE IDs does GHSA-m5wq-r4r4-4qrh cover?

GHSA-m5wq-r4r4-4qrh covers the following CVE IDs: CVE-2026-4437. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-m5wq-r4r4-4qrh?

GHSA-m5wq-r4r4-4qrh has a CVSS v3 base score of 7.5, published by GitHub Security Advisories.

GHSA-m5wq-r4r4-4qrhHighCVSS 7.5

Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the...

Vendor

GitHub Security Advisories

Published

March 20, 2026

Last Modified

July 14, 2026

🔗 CVE IDs covered (1)

CVE-2026-4437 →

📋 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 (4)

https://nvd.nist.gov/vuln/detail/CVE-2026-4437
https://sourceware.org/bugzilla/show_bug.cgi?id=34014
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
https://github.com/advisories/GHSA-m5wq-r4r4-4qrh