CVE-2026-81341 wolfEngine reuses the AES-CCM nonce on TLS 1.2 / DTLS 1.2 records
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-81341?
CVE-2026-81341 is a medium-severity vulnerability in wolfSSL Inc. wolfEngine, published on 28 Aug 2026.
Official description
wolfEngine before 1.4.1 sources the explicit AES-CCM nonce for TLS 1.2 and DTLS 1.2 records from the record input buffer instead of the TLS sequence number carried in the additional authenticated data. Because the record layer leaves the explicit-nonce field for the cipher to populate, the value read is constant across records, so every AES-CCM record within a connection is encrypted under an identical key and nonce pair. Reusing a CCM key and nonce weakens confidentiality (identical keystream across records, so a known record recovers the others) and integrity (authentication tag forgery). Only wolfEngine is affected; wolfProvider is not. AES-GCM under wolfEngine is tracked separately. AES-CCM cipher suites are not enabled by default and must be explicitly selected, which limits exposure. TLS 1.3 and non-TLS use of the cipher are not affected.
Weakness: CWE-323
Which versions are affected by CVE-2026-81341?
It affects 1 product.
Products include Wolfssl Wolfengine.
How do I fix CVE-2026-81341?
No fix has been published for CVE-2026-81341 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-81341 being exploited?
There is no known exploitation of CVE-2026-81341 in the wild and no public exploit code.
Other vulnerabilities in wolfSSL Inc. wolfEngine
Sources
Also known as GHSA-vf9h-5c79-c2xp.