| Título | Cesanta Mongoose Embedded Web Server 7.20 Improper Verification of Cryptographic Signature |
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| Descrição | The mg_chacha20_poly1305_decrypt() function in /src/tls_chacha20.c never computes or verifies the Poly1305 authentication tag during decryption, completely bypassing the authentication guarantee of the AEAD cipher. Because ChaCha20 is a stream cipher, this allows a man-in-the-middle attacker to perform bit-flipping attacks on any TLS record, thus modifying encrypted data in transit with byte-level precision, and the Mongoose server will accept the tampered record as authentic. This renders TLS connections using the built-in TLS implementation completely unauthenticated.
Vendor recognizes that this is a serious vulnerability but is incapable or unwilling to fix it. |
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| Fonte | ⚠️ https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md |
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| Utilizador | dwbruijn (UID 93926) |
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| Submissão | 12/02/2026 08h26 (há 8 meses) |
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| Moderação | 22/02/2026 08h57 (10 days later) |
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| Estado | Aceite |
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| Entrada VulDB | 347335 [Cesanta Mongoose até 7.20 Poly1305 Authentication Tag /src/tls_chacha20.c mg_chacha20_poly1305_decrypt Autenticação fraca] |
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| Pontos | 20 |
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