What is CVE-2026-5450?

CVE-2026-5450 is a critical-severity vulnerability in Gnu Glibc, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-04-20.

How severe is CVE-2026-5450?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Gnu Glibc

CVE-2026-5450

Calling the scanf family of functions with a %mc (malloc'd character match) in the GNU C Library version 2.7 to version 2.43 with a format width specifier with an explicit width greater than 1024 could result in a one byte heap buffer over…

Vulnerability class: Buffer Overflow

EPSS: 0.005 (39.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Gnu Glibc
The Gnu C Library Glibc — versions 2.7

Weakness classification (CWE)

References

3ff69d7a-14f2-4f67-a097-88dee7810d18 (issue-tracking, Exploit, Issue Tracking)
3ff69d7a-14f2-4f67-a097-88dee7810d18 (mailing-list, Third Party Advisory)
0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

Frequently asked questions

What is CVE-2026-5450?: CVE-2026-5450 is a critical-severity vulnerability in Gnu Glibc, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-04-20.
How severe is CVE-2026-5450?: Critical severity. CVSS v3 base score is 9.8 out of 10.