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CVE-2026-58081 is a buffer overflow vulnerability in FreeBSD's iconv(3) encoding conversion modules. According to the provided advisory context, several encoding modules, including HZ, UTF-7, VIQR, and ZW, failed to properly check the size of the caller-supplied output buffer before writing converted characters. The issue can be triggered by applications that use iconv(3) to process untrusted text in affected encodings, including HZ, UTF-7, VIQR, ZW, and related conversion paths referenced in the advisory. This is distinct from the separate ISO-2022 stack overflow issue tracked as CVE-2026-58082. The flaw arises from improper bounds checking during character set conversion, leading to out-of-bounds writes into the output buffer supplied by the caller.
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7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An iconv vulnerability affecting conversion of certain stateful encodings including HZ, UTF-7, VIQR, ZW, and ISO-2022.
An iconv vulnerability in FreeBSD that can affect applications processing untrusted text in certain legacy encodings.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.