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Description

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 Reserved 2026-02-22 | Published 2026-02-23 | Updated 2026-02-23 | Assigner VulDB




MEDIUM: 6.3CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
LOW: 3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
LOW: 3.7CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
2.6AV:N/AC:H/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:UR

Problem types

Improper Verification of Cryptographic Signature

Insufficient Verification of Data Authenticity

Product status

7.0
affected

7.1
affected

7.2
affected

7.3
affected

7.4
affected

7.5
affected

7.6
affected

7.7
affected

7.8
affected

7.9
affected

7.10
affected

7.11
affected

7.12
affected

7.13
affected

7.14
affected

7.15
affected

7.16
affected

7.17
affected

7.18
affected

7.19
affected

7.20
affected

Timeline

2026-02-22:Advisory disclosed
2026-02-22:VulDB entry created
2026-02-22:VulDB entry last update

Credits

dwbruijn (VulDB User) reporter

References

vuldb.com/?id.347335 (VDB-347335 | Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c mg_chacha20_poly1305_decrypt signature verification) vdb-entry technical-description

vuldb.com/?ctiid.347335 (VDB-347335 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/?submit.757091 (Submit #757091 | Cesanta Mongoose Embedded Web Server 7.20 Improper Verification of Cryptographic Signature) third-party-advisory

github.com/...jn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md related

github.com/...jn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md exploit

cve.org (CVE-2026-2968)

nvd.nist.gov (CVE-2026-2968)

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