Low 3.7Published Feb 22, 2026

CVE-2026-2968Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c mg_chacha20_poly1305_decrypt signature verification

Updated under an hour ago (Oct 26, 2026, 9:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for Cesanta Mongoose

Exploited in the last 30 days

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.

CVSS: 3.7 LOW (v3.1, CNA)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
Weakness (CWE): CWE-347, CWE-345
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulDB
NVD analysis: Analyzed
Record last updated: Feb 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Cesanta Mongoose cesanta:mongoose	7.0; 7.1; 7.2; 7.3; 7.4; 7.5; 7.6; 7.7; and 13 more ranges	CNA record
cesanta mongoose cesanta:mongoose	through 7.20	NVD

References

References

https://vuldb.com/?id.347335	vdb-entry, technical-description, third-party-advisory
https://vuldb.com/?ctiid.347335	signature, permissions-required, vdb-entry
https://vuldb.com/?submit.757091	third-party-advisory, vdb-entry
https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md	related, exploit, third-party-advisory
https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md#poc	exploit, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.