What is CVE-2026-122054?

CVE-2026-122054 is a medium-severity vulnerability in The GNU C Library Glibc, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.9/10. Published 2026-11-04.

How severe is CVE-2026-122054?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in The GNU C Library Glibc

CVE-2026-122054

Converting crafted BIG-HKSCS input to UCS-4 or the internal wide character encoding, for example with iconv, in the GNU C Library version 2.18 through 2.31 may result in the converter making no progress, causing the calling application to hang.

Published 2026-11-04 · last modified 2026-11-04.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

The GNU C Library Glibc

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

3ff69d7a-14f2-4f67-a097-88dee7810d18 (issue-tracking)
3ff69d7a-14f2-4f67-a097-88dee7810d18 (vendor-advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-122054?: CVE-2026-122054 is a medium-severity vulnerability in The GNU C Library Glibc, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.9/10. Published 2026-11-04.
How severe is CVE-2026-122054?: Medium severity. CVSS v3 base score is 5.9 out of 10.