CVE-2026-8720

HighCVSS 7.5/10Last modified Jun 27, 2026

Description

wc_Blake2bHmacFinal and wc_Blake2sHmacFinal discard the message when the key length exceeds the block size, producing a MAC that is independent of the input. When the supplied key is longer than the BLAKE2 block size the key-hashing branch reinitialized the running hash state, discarding the accumulated message data, so the resulting MAC depended only on the key and not on the message being authenticated. This bug is specific to the HMAC-BLAKE2 APIs that were added in wolfSSL version 5.9.0.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-354

Affected software

No affected versions have been published.

Timeline

Published
Jun 25, 2026
Last modified
Jun 27, 2026
NVD status
Analyzed

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CVE-2026-8720: High severity, CVSS 7.5 | Vulnix