What is CVE-2026-6238?

CVE-2026-6238 is a medium-severity vulnerability in Gnu Glibc, classified under Buffer Over-read. CVSS score: 6.5/10. Published 2026-04-28.

How severe is CVE-2026-6238?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Gnu Glibc

CVE-2026-6238

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 rec…

EPSS: 0.004 (28.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L.

Affected products

Gnu Glibc
The Gnu C Library Glibc — versions 2.2, 2.0.1

Weakness classification (CWE)

CWE-126 — Buffer Over-read

References

3ff69d7a-14f2-4f67-a097-88dee7810d18 (Issue Tracking)
3ff69d7a-14f2-4f67-a097-88dee7810d18 (Third Party Advisory)
0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

Frequently asked questions

What is CVE-2026-6238?: CVE-2026-6238 is a medium-severity vulnerability in Gnu Glibc, classified under Buffer Over-read. CVSS score: 6.5/10. Published 2026-04-28.
How severe is CVE-2026-6238?: Medium severity. CVSS v3 base score is 6.5 out of 10.