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CVE-2026-2968

Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c mg_chacha20_poly1305_decrypt signature verification

Published: Feb 23, 2026Updated: Apr 29, 2026 Sources: CVE List NVDCWE-345
NVD MITRE
3.7CVSSLOW
EPSS Score
0.2%
Top 87.9%
CISA KEV
Not in KEV
Exploits
2 Known
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-345CWE-347

Affected Products

mongoosecesantaOSS Libraries
MongooseCesantaOSS Libraries
cesantaoss-projectOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

2 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

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MITRE ATT&CK

1 technique
Collection
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References

https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md
github.com
https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md#poc
github.com
https://vuldb.com/?ctiid.347335
vuldb.com
and 2 more references View all →

Timeline

Published
Feb 23, 2026
Last Updated
Apr 29, 2026

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