Reusing a Nonce, Key Pair in Encryption in wolfSSL - CVE-2026-55967
Published: July 1, 2026
Vulnerability identifier: #VU136658
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-55967
CWE-ID: CWE-323
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 recover plaintext.
The vulnerability exists due to improper input validation in the AES-GCM streaming APIs when processing extremely large cumulative single message sizes. A remote attacker can trigger counter wrap and keystream reuse to recover plaintext.
The issue occurs for cumulative single message sizes greater than 64 GiB.
How to mitigate CVE-2026-55967
Install security update from vendor's website.