CVE-2026-81020wolfEngine reuses the AES-GCM nonce on every TLS 1.2 / DTLS 1.2 record
Updated under an hour ago ()
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It affects wolfSSL Inc. wolfEngine. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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wolfEngine before 1.4.1 generates the 8-byte explicit AES-GCM nonce once when the TLS write key is set and never increments it per record. As a result every TLS 1.2 and DTLS 1.2 AES-GCM record within a connection is encrypted under an identical key and nonce pair. Reusing a GCM key and nonce discloses the keystream (the XOR of two ciphertexts equals the XOR of their plaintexts, so one known record recovers the others) and leaks the GHASH authentication key, enabling authentication tag forgery. AES-CCM, TLS 1.3, and non-TLS use of the cipher are not affected.
- CVSS
- 7.4 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-323
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- wolfSSL
- NVD analysis
- Analyzed
- Record last updated
- Aug 28, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
wolfSSL Inc. wolfEngine wolfssl:wolfengine (from the name) | through 1.4.0 | CNA record |
wolfssl wolfengine wolfssl:wolfengine | before 1.4.1 | NVD |
References
- https://www.wolfssl.com/docs/security-vulnerabilities/vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.