wolfSSL wolfProvider up to 1.2.1 information disclosure

Summaryinfo

A vulnerability described as problematic has been identified in wolfSSL wolfProvider up to 1.2.1. Affected is an unknown function. Such manipulation leads to information disclosure. This vulnerability is listed as CVE-2026-81019. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in wolfSSL wolfProvider up to 1.2.1. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

wolfProvider before 1.2.2 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.

The advisory is available at wolfssl.com. This vulnerability is handled as CVE-2026-81019 since 08/26/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 1.2.2 eliminates this vulnerability.

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Productinfo

Vendor

• wolfSSL

Name

• wolfProvider

Version

• 1.2.0
• 1.2.1

License

• open-source

CPE 2.3info

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• 🔒

CPE 2.2info

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