EUVD-2026-62349
GHSA-r57r-q66w-6qxq
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AC:H because exploitation depends on the calling app transcoding untrusted input via an affected ISO-2022 variant and a 4-byte bound complicates control; PR:N/UI:N as the library itself needs no auth.
Primary rating from Vendor (freebsd).
CVSS VectorVendor: freebsd
Lifecycle Timeline
4DescriptionCVE.org
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.
AnalysisAI
Stack buffer overflow in the FreeBSD iconv(3) ISO-2022 encoding modules allows a 4-byte out-of-bounds write when converting untrusted text to or from certain ISO-2022 variants. The affected code sizes an intermediate output buffer to MB_LEN_MAX (6 bytes), but some ISO-2022 variants emit up to 10 bytes per character, overflowing the stack. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an application on an affected FreeBSD release that calls iconv(3) to convert attacker-controlled input to or from one of the affected ISO-2022 encoding variants (the ones that can emit up to 10 bytes per character); the overflow only triggers on that specific encoding path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The published CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N, base 9.8) treats this as trivially remote and unauthenticated, but that scoring reflects the worst case for an application that feeds attacker-controlled data straight through iconv into an affected ISO-2022 encoding - it is a library primitive, not a directly network-listening service, so real exposure is entirely a function of how a given application calls iconv. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the FreeBSD security patch bringing systems to the fixed patch levels: 14.3-RELEASE-p16, 14.4-RELEASE-p7, 15.0-RELEASE-p11, or 15.1-RELEASE-p1 (Vendor-released patch), via freebsd-update or by rebuilding libc from the branch, per FreeBSD-SA-26:49.iconv (https://security.freebsd.org/advisories/FreeBSD-SA-26:49.iconv.asc); note that because the fix is in libc, long-running services should be restarted (or the host rebooted) so processes pick up the patched library. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running FreeBSD 14.3, 14.4, 15.0, or 15.1 and document which applications use iconv(3) for character encoding conversion. …
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View allSame technique Stack Overflow
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External POC / Exploit Code
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