by Kastro
Paper/Archive/CVE-2026-58081

CVE-2026-58081

FreeBSD FreeBSD — Heap based buffer overflow in iconv(3)

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
38
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 44.1.441 × 208.8No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Several encoding modules, including HZ, UTF-7, VIQR, and ZW, did not properly check the size of the caller-supplied output buffer before writing converted characters. An application that uses iconv(3) to convert untrusted input to or from one of the affected encodings may be vulnerable to buffer overflows if it uses one of the affected encoding modules.

Affected

ProductAffectedFixed inSource
FreeBSD15.1-RELEASE – < p1p1CNA
FreeBSD15.0-RELEASE – < p11p11CNA
FreeBSD14.4-RELEASE – < p7p7CNA
FreeBSD14.3-RELEASE – < p16p16CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorysecurity.freebsd.org/advisories/FreeBSD-SA-26:49.iconv.asc