CVE-2026-49425: FreeBSD · Use of Uninitialized Resource
Affects FreeBSDSource GCVE Database
Not known to be exploited · CVSS 5.5 Medium.
Data as of 27 Oct 2026, 14:15 UTC
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:NExploitation evidence
Disclosed: evidence found.
CVE published 19 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| FreeBSD FreeBSD | Affected
| Fixed in– |
AI-suggested
Until an official fix is available, users should monitor vendor communications for updates. No specific workaround or temporary fix is provided in the available information.
Description
CVE-2026-49425 is a vulnerability in FreeBSD's compat32 kevent() handler where a 64-bit kevent struct is translated into a 32-bit struct on the stack without zeroing it first. This leads to the potential exposure of uninitialized kernel stack data to unprivileged users, which may contain sensitive information. The flaw affects FreeBSD versions 14.3-RELEASE, 14.4-RELEASE, and 15.0-RELEASE. The vulnerability has a medium severity with a CVSS score of 5.5.