Insufficient verification of data authenticity in wolfSSL - CVE-2026-5477
Published: April 14, 2026
Vulnerability identifier: #VU125928
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-5477
CWE-ID: CWE-345
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: wolfSSL
Affected software:
wolfSSL
wolfSSL
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass message authentication integrity checks.
The vulnerability exists due to improper cryptographic implementation in AES-EAX AEAD and CMAC processing when handling messages larger than 4 GiB. A remote attacker can modify the first 4 GiB of ciphertext in an observed valid message to bypass message authentication integrity checks.
Exploitation requires observing one valid ciphertext and tag pair for a message larger than 4 GiB.
How to mitigate CVE-2026-5477
Install security update from vendor's website.