# CVE-2026-49421

## Summary

- **CVE ID:** CVE-2026-49421
- **Severity:** HIGH
- **CVSS Score:** 7.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H)
- **CWE:** CWE-273
- **Published:** Aug 19, 2026
- **Last Modified:** Aug 26, 2026

## Description

The kernel function that implements unlinkat(2) and funlinkat(2) validated the AT_RESOLVE_BENEATH flag but failed to pass it through to the underlying path lookup.  The flag was silently dropped, so path resolution was not actually restricted.

A process that uses AT_RESOLVE_BENEATH with unlinkat(2) or funlinkat(2) to confine path resolution can in fact resolve paths above the starting directory.  A caller relying on this flag for path containment may delete files outside the intended directory tree.

## Affected Products

- FreeBSD — FreeBSD (15.1-RELEASE)
- FreeBSD — FreeBSD (15.0-RELEASE)
- FreeBSD — FreeBSD (14.4-RELEASE)
- FreeBSD — FreeBSD (14.3-RELEASE)

## References

- [CNA](https://security.freebsd.org/advisories/FreeBSD-SA-26:42.unlinkat.asc)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.09%
- **EPSS Percentile:** 0.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._