HIGHVulnerability
Verified
Global

NVD HIGH: CVE-2026-8720 — wc_Blake2bHmacFinal and wc_Blake2sHmacFinal discard the message when the key len...

·Source: NIST NVD

Updated:

Executive Summary

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 authen

Analysis

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. CVSS Score: 7.5. Published: 2026-06-25T22:17:03.390.

Indicators of Compromise (1)

CVE (1)
CVE-2026-8720
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Jun 25, 2026. Verified by: NIST.

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