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CVE-2026-6238

Buffer overread in ns_printrrf with corrupted RDATA field

Published: Apr 28, 2026Updated: Jun 19, 2026 Sources: CVE List NVDCWE-126
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.3%
Top 77.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

Description

The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.0.1 to version 2.43 fail to validate the RDATA content against the RDATA length in a DNS response when processing A6, CERT, LOC, 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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-126

Affected Products

glibcThe GNU C Library
Library
OSS Libraries / generic-library
glibcgnuOSS Libraries
the gnu c libraryoss-projectOSS Librariesaka glibc
gnuoss-projectUSOSS Librariesaka g. nu

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://sourceware.org/bugzilla/show_bug.cgi?id=34069
sourceware.org
https://inbox.sourceware.org/libc-announce/7a655d55-276f-41fe-b550-feb3ebb2ce91@redhat.com/T/#u
inbox.sourceware.org

Timeline

Published
Apr 28, 2026
Last Updated
Jun 19, 2026

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