CVE-2026-58085: FreeBSD · Improper Verification of Cryptographic Signature
Affects FreeBSDSource GCVE Database
Not known to be exploited · CVSS 7.5 High.
Data as of 27 Oct 2026, 14:14 UTC
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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
Users should monitor FreeBSD vendor advisories for official fixes. Until a patch is available, consider restricting UDP access to WireGuard endpoints to trusted sources to reduce exposure. Avoid relying on the affected FreeBSD versions for critical WireGuard deployments.
Description
CVE-2026-58085 is a vulnerability in the FreeBSD wg(4) driver where it fails to verify the success of the MAC (Poly1305) authentication tag during packet decryption. This flaw allows a remote attacker who can send UDP packets to a WireGuard endpoint and guess the receiver's replay window bounds to inject forged or modified transport data packets into the tunnel. Additionally, an attacker intercepting WireGuard packets can modify ciphertext and authenticated data without detection.