What is CVE-2026-0861?

CVE-2026-0861 is a high-severity vulnerability in Gnu Glibc, classified under Integer Overflow or Wraparound. CVSS score: 8.4/10. Published 2026-01-14.

How severe is CVE-2026-0861?

High severity. CVSS v3 base score is 8.4 out of 10.

Integer overflow in Gnu Glibc

CVE-2026-0861

Passing too large an alignment to the memalign suite of functions (memalign, posix_memalign, aligned_alloc) in the GNU C Library version 2.30 to 2.42 may result in an integer overflow, which could consequently result in a heap corruption. …

Vulnerability class: Integer Overflow

EPSS: 0.004 (27.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Gnu Glibc
The Gnu C Library Glibc — versions 2.30

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

3ff69d7a-14f2-4f67-a097-88dee7810d18 (Exploit)
3ff69d7a-14f2-4f67-a097-88dee7810d18 (Patch)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Patch)

Frequently asked questions

What is CVE-2026-0861?: CVE-2026-0861 is a high-severity vulnerability in Gnu Glibc, classified under Integer Overflow or Wraparound. CVSS score: 8.4/10. Published 2026-01-14.
How severe is CVE-2026-0861?: High severity. CVSS v3 base score is 8.4 out of 10.