Critical severity · published Aug 19, 2026
CVE-2026-58082
Stack based buffer overflow in iconv(3)
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
The ISO-2022 encoding module used a stack buffer sized to MB_LEN_MAX (6 bytes) for intermediate character output. Some ISO-2022 variants can require up to 10 bytes per character, in which case conversions can trigger a stack buffer overflow of up to four bytes.
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FR
FreeBSD · FreeBSD
15.1-RELEASE before p1; 15.0-RELEASE before p11; 14.4-RELEASE before p7; 14.3-RELEASE before p16 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-58082
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-58082
Vendor Advisory
https://security.freebsd.org/advisories/FreeBSD-SA-26:49.iconv.asc
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