| Titre | Cesanta Mongoose Embedded Web Server 7.20 Improper Verification of Cryptographic Signature |
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| Description | 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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| La source | ⚠️ https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md |
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| Utilisateur | dwbruijn (UID 93926) |
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| Soumission | 12/02/2026 08:26 (il y a 3 mois) |
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| Modérer | 22/02/2026 08:57 (10 days later) |
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| Statut | Accepté |
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| Entrée VulDB | 347335 [Cesanta Mongoose jusqu’à 7.20 Poly1305 Authentication Tag /src/tls_chacha20.c mg_chacha20_poly1305_decrypt authentification faible] |
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| Points | 20 |
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