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    CVE-2026-2968

    A vulnerability was detected in Cesanta Mongoose up to 7.20. This impacts the function mg_chacha20_poly1305_decrypt of the file /src/tls_chacha20.c of the component Poly1305 Authentication Tag Handler. The manipulation results in improper verification of cryptographic signature. The attack may be launched remotely. This attack is characterized by high complexity. The exploitability is said to be difficult. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

    Published:Feb 23, 2026
    Last Modified:Apr 18, 2026
    EPS:Feb 23, 2026
    EPSS Score:0.00015
    CVSS Score:3.7

    Affected Products

    Vendor
    Cesanta
    Product
    Mongoose

    Exploits

    https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.mdhttps://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md#poc

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High