What is CVE-2026-5928?

CVE-2026-5928 is a high-severity vulnerability in Gnu Glibc, classified under Buffer Under-read. CVSS score: 7.5/10. Published 2026-04-20.

How severe is CVE-2026-5928?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Gnu Glibc

CVE-2026-5928

Calling the ungetwc function on a FILE stream with wide characters encoded in a character set that has overlaps between its single byte and multi-byte character encodings, in the GNU C Library version 2.43 or earlier, may result in an atte…

EPSS: 0.004 (29.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Gnu Glibc
The Gnu C Library Glibc — versions 2.1.1-89

Weakness classification (CWE)

CWE-127 — Buffer Under-read

References

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

Frequently asked questions

What is CVE-2026-5928?: CVE-2026-5928 is a high-severity vulnerability in Gnu Glibc, classified under Buffer Under-read. CVSS score: 7.5/10. Published 2026-04-20.
How severe is CVE-2026-5928?: High severity. CVSS v3 base score is 7.5 out of 10.