Legacy Functions in GNU C Library Allow Application Crashes and Memory Issues
CVE-2026-6238

6.5MEDIUM

Key Information:

Vendor

The Gnu C Library

Status
Glibc
Vendor
CVE Published:
28 April 2026

What is CVE-2026-6238?

The deprecated functions ns_printrrf, ns_printrr, and fp_nquery in the GNU C Library versions 2.2 and newer are vulnerable due to a failure to validate RDATA content against its length when processing certain DNS records. This oversight allows an attacker to create a malicious DNS response that could lead to application crashes or the reading of uninitialized memory. These functions, intended for application debugging, have been deprecated since version 2.34, and applications utilizing them are encouraged to transition to more secure alternatives, as these functions may be removed in future updates.

Affected Version(s)

glibc 2.2 <= 0

References

https://sourceware.org/bugzilla/show_bug.cgi?id=34069
https://inbox.sourceware.org/libc-announce/7a655d55-276f-...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.