What is CVE-2026-5435?

CVE-2026-5435 is a high-severity vulnerability in Gnu Glibc, classified under Out-of-bounds Write. CVSS score: 7.3/10. Published 2026-04-28.

How severe is CVE-2026-5435?

High severity. CVSS v3 base score is 7.3 out of 10.

Buffer overflow in Gnu Glibc

CVE-2026-5435

The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.2 and newer fail to enforce the caller-supplied buffer length, and can result in an out-of-bounds write when printing TSIG records.

Vulnerability class: Buffer Overflow

EPSS: 0.000 (15.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

Affected products

Gnu Glibc
The Gnu C Library Glibc — versions 2.2

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

3ff69d7a-14f2-4f67-a097-88dee7810d18 (issue-tracking, Issue Tracking)
3ff69d7a-14f2-4f67-a097-88dee7810d18 (mailing-list, Third Party Advisory)

Frequently asked questions

What is CVE-2026-5435?: CVE-2026-5435 is a high-severity vulnerability in Gnu Glibc, classified under Out-of-bounds Write. CVSS score: 7.3/10. Published 2026-04-28.
How severe is CVE-2026-5435?: High severity. CVSS v3 base score is 7.3 out of 10.