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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.007 (49.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
- GNU Glibc
- The GNU C Library Glibc — versions 2.3.3
Weakness classification (CWE)
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.