CVE-2026-4046 Details
Description
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.
A denial-of-service vulnerability has been identified in the GNU C Library (glibc) iconv() function, affecting versions through 2.43. When converting inputs from the IBM1390 or IBM1399 character sets, the function may crash due to an assertion failure. This issue can be remotely exploited to crash applications that use these character sets. The vulnerability arises because the combined-word attribute of the IBM1390 and IBM1399 encodings can lead to improper handling of internal buffers, causing the assertion error. This bug is particularly problematic for applications like 'mutt', where such crashes can disrupt access to mail folders.
Users can remove the IBM1390 and IBM1399 character sets from their systems to mitigate this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 30, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://cert-portal.siemens.com/productcert/html/ssa-082556.html | siemens-SADP | |
| https://inbox.sourceware.org/libc-announce/[email protected]/T/#u | GNU C Library | |
| https://sourceware.org/bugzilla/show_bug.cgi?id=33980 | GNU C Library | ExploitIssue TrackingPatch |
| https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0007;hb=HEAD | GNU C Library | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-617 | Reachable Assertion | GNU C Library |
Affected Products
| Product | Versions |
|---|---|
| gnu glibc | <= 2.43 |
CPE
Remediation
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Change History
7 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 14, 2026 | CVE Modified | siemens-SADP |
| Jun 17, 2026 | CVE Modified | GNU C Library |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 20, 2026 | CVE Modified | GNU C Library |
| Apr 7, 2026 | Initial Analysis | [email protected] |
| Mar 30, 2026 | New CVE Received | GNU C Library |
| Mar 30, 2026 | CVE Modified | CISA-ADP |