CVE-2026-2968

LOW 3.7

Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c mg_chacha20_poly1305_decrypt signature verification

CVSS Score

3.7

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-347 CWE-345
Vendor	cesanta
Product	mongoose
Published	Feb 23, 2026
Last Updated	Feb 23, 2026

Stay Ahead of the Next One

Get instant alerts for cesanta mongoose

Be the first to know when new low vulnerabilities affecting cesanta mongoose are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

Cesanta / Mongoose

7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 7.10 7.11 7.12 7.13 7.14 7.15 7.16 7.17 7.18 7.19 7.20

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/?id.347335 vuldb.com: https://vuldb.com/?ctiid.347335 vuldb.com: https://vuldb.com/?submit.757091 github.com: https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md github.com: https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md#poc

Credits

🔍 dwbruijn (VulDB User)