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Back to active CVEs
High ยท CVSS 7.5CVE-2026-58085

Missing MAC validation in wg(4) packet decryption

Answer in brief

CVE-2026-58085 records a High severity (CVSS 7.5) vulnerability in Missing MAC validation in wg(4) packet decryption. The current sources do not mark it as known exploited. The current feed maps FreeBSD/FreeBSD (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 19, 2026Updated Aug 31, 2026Source checked Oct 3, 2026First seen by HOL Aug 19, 2026Material review Aug 31, 2026
Upstream Advisory

Key facts

Risk
High ยท CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
26 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps FreeBSD/FreeBSD (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:o:freebsd:freebsd:14.4:-:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:p1:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:p2:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:p3:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:p4:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:p5:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:p6:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:p7:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:14.4:rc1:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:-:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p1:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p10:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p11:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p2:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p3:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p4:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p5:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p6:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p7:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p8:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.0:p9:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.1:-:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.1:p1:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.1:rc2:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:freebsd:freebsd:15.1:rc3-p1:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
FreeBSD/FreeBSDgeneric>=15.1-RELEASE <p2 || >=15.0-RELEASE <p12 || >=14.4-RELEASE <p8p2, p12, p8

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for FreeBSD/FreeBSD.
  2. 2Review the reported fix. Update FreeBSD/FreeBSD to p2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Aug 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 31, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 19, 2026

Sources and claim methodology

  • Source referencesecurity.freebsd.org
Upstream source description

After dispatching a decrypt operation to OCF and receiving the result, the wg(4) driver failed to check whether the MAC verification step succeeded. The driver thus silently accepted packets with an invalid Poly1305 authentication tag. A remote attacker who can send UDP packets to a WireGuard endpoint, and who can guess the bounds of the receiver's replay window, can inject forged or modified transport data packets into the tunnel. A remote attacker who can intercept WireGuard packets bound for a FreeBSD host can modify the ciphertext and authenticated data without detection by the receiver.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • OpenAM before 16.1.3 Open Redirect via Unverified id_token_hint in endSessionAlso CWE-347
  • OpenPGP data signature accepted from a signing subkey without cross-certificationAlso CWE-347
  • BLS12-381 key validation accepts a public key built on a foreign curveAlso CWE-347
  • WP Ultimate Review <= 2.4.3 - Unauthenticated Arbitrary Shortcode Execution via 'xs_reviw_summery' Parameter (Split-Shortcode / Late-Registered Shortcode)Same generic ecosystem
  • WordPress Kirki plugin <= 6.3.1 - Arbitrary Code Execution vulnerabilitySame generic ecosystem
  • WordPress Unlimited Elements For Elementor (Free Widgets, Addons, Templates) plugin <= 2.0.20 - Cross Site Scripting (XSS) vulnerabilitySame generic ecosystem

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-347
Source
CVE List V5
Source checked
Oct 3, 2026
References
1 linked source
Open source record