CVE-2026-4046: iconv crash due to assertion failure with untrusted input
CSIRTS triage
- What
- iconv utility crashes on assertion failure when processing untrusted input.
- Who is affected
- Systems using iconv utility to process user-supplied or untrusted character set conversion requests.
- Urgency
- High priority; assertion failure indicates potential for denial of service and crash on crafted input.
- Action
- Update iconv to patched version; validate input before processing if update is delayed.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-4046
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-40460.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-4046 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- medium[UPDATE] [medium] GNU libc: Vulnerability allows denial of servicecert-bund
- unknownUSN-8611-1: GNU C Library vulnerabilitiesubuntu
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