CVE-2026-81341 wolfSSL Inc. CVE debrief

Who should care

Organizations using wolfEngine for TLS or DTLS communications, especially those relying on AES-CCM cipher suites, should review and potentially update their configurations to mitigate potential risks. This includes verifying wolfEngine version and upgrading to 1.4.1 or later if necessary. Security teams and vulnerability management teams should prioritize review of wolfEngine deployments and assess potential exposure. Platform operators and administrators should also be aware of the vulnerability and its potential impact on their systems and data. Monitoring for potential confidentiality and integrity impacts due to nonce reuse is recommended.

Technical summary

wolfEngine before 1.4.1 incorrectly 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. This results in identical key and nonce pairs for all AES-CCM records within a connection, weakening confidentiality and integrity. The vulnerability affects AES-CCM cipher suites, which are not enabled by default and must be explicitly selected. wolfProvider is not affected, and AES-GCM under wolfEngine is tracked separately. TLS 1.3 and non-TLS use of the cipher are not affected.

Defensive priority

Medium-priority defensive review recommended due to potential confidentiality and integrity impacts.

Recommended defensive actions

• Review wolfEngine configurations for explicit AES-CCM cipher suite selection.
• Verify wolfEngine version and upgrade to 1.4.1 or later if necessary.
• Monitor for potential confidentiality and integrity impacts due to nonce reuse.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

Evidence from official CVE and NVD sources indicates a medium-severity vulnerability in wolfEngine before 1.4.1, affecting AES-CCM nonce generation for TLS 1.2 and DTLS 1.2 records. Limited details available on exploitability and affected systems. Defenders should verify wolfEngine configurations, review potential exposure, and monitor for confidentiality and integrity impacts due to nonce reuse. Additional review of wolfssl security advisories and wolfEngine deployment configurations is recommended.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.