Vulnerability in Cesanta Mongoose
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 · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (17.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Cesanta Mongoose — versions 7.0, 7.1, 7.2
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md (related, Exploit, Third Party Advisory)
- github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md (Exploit, Third Party Advisory, exploit)
Frequently asked questions
- What is CVE-2026-2968?
- CVE-2026-2968 is a low-severity vulnerability in Cesanta Mongoose, classified under Insufficient Verification of Data Authenticity. CVSS score: 3.7/10. Published 2026-02-23.
- How severe is CVE-2026-2968?
- Low severity. CVSS v3 base score is 3.7 out of 10.