CVE-2026-6238 — MEDIUM (6.5)

Vulnerability Description

The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.2 and newer fail to validate the RDATA content against the RDATA length in a DNS response when processing LOC, CERT, TKEY or TSIG records, which may allow an attacker to craft a DNS response, causing a target application to crash or read uninitialized memory. These functions are for application debugging only and hence not in the path of code executed by the DNS resolver. Further, they have been deprecated since version 2.34 and should not be used by any new applications. Applications should consider porting away from these interfaces since they may be removed in future versions.

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

NONE

Availability

LOW

Affected Products

Vendor	Product	Versions
Gnu	Glibc	>= 2.2

Related Weaknesses (CWE)

CWE-126

References

https://inbox.sourceware.org/libc-announce/7a655d55-276f-41fe-b550-feb3ebb2ce91@Third Party Advisory
https://sourceware.org/bugzilla/show_bug.cgi?id=34069Issue Tracking

FAQ

What is CVE-2026-6238?

CVE-2026-6238 is a vulnerability with a CVSS score of 6.5 (MEDIUM). The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.2 and newer fail to validate the RDATA content against the RDATA length in a DNS response when processing ...

How severe is CVE-2026-6238?

CVE-2026-6238 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-6238?

Check the references section above for vendor advisories and patch information. Affected products include: Gnu Glibc.