What is CVE-2026-4046?

CVE-2026-4046 is a high-severity vulnerability in Gnu Glibc, classified under Reachable Assertion. CVSS score: 7.5/10. Published 2026-03-30.

How severe is CVE-2026-4046?

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

Vulnerability in Gnu Glibc

CVE-2026-4046

The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an application. This vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character sets from systems that do not need them.

EPSS: 0.004 (30.6th 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 2.3.3

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

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

Frequently asked questions

What is CVE-2026-4046?: CVE-2026-4046 is a high-severity vulnerability in Gnu Glibc, classified under Reachable Assertion. CVSS score: 7.5/10. Published 2026-03-30.
How severe is CVE-2026-4046?: High severity. CVSS v3 base score is 7.5 out of 10.