This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page.
View CVE-2026-8720 →
DEBIAN-CVE-2026-8720
wc_Blake2bHmacFinal and wc_Blake2sHmacFinal discard the message when the key length exceeds the block size, producing a MAC that is independent of the...
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) OSV
Affected packages
Debian:12
wolfssl
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Debian:13
wolfssl
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
References
- advisory security-tracker.debian.org