CVEvulnerability

CVE-2026-8720

5.9 MEDIUM Published 2026-06-25 Modified 2026-06-27 Official page ↗
Status
Analyzed
Published
2026-06-25
Last modified
2026-06-27
Assigner
[email protected]
CVSS 4.0 ([email protected])
5.9 MEDIUM — CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weaknesses
CWE-354

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.

Affected configurations

• wolfssl wolfssl (>= 5.9.0 < 5.9.2)

Related

Weakness · CWE (1)

  • CWE-354 Improper Validation of Integrity Check Value weakness

References