CVE-2026-2968
Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c mg_chacha20_poly1305_decrypt signature verification
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.
INFO
Published Date :
Feb. 23, 2026, 4:16 a.m.
Last Modified :
Feb. 23, 2026, 8:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | LOW | [email protected] | ||||
| CVSS 3.1 | LOW | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Cesanta Mongoose to a version later than 7.20.
- Apply security patches provided by the vendor.
- Review cryptographic implementations for flaws.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-2968.
| URL | Resource |
|---|---|
| https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md | Exploit Third Party Advisory |
| https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md#poc | Exploit Third Party Advisory |
| https://vuldb.com/?ctiid.347335 | Permissions Required VDB Entry |
| https://vuldb.com/?id.347335 | Third Party Advisory VDB Entry |
| https://vuldb.com/?submit.757091 | Third Party Advisory VDB Entry |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-2968 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-2968
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-2968 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-2968 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 23, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:* versions up to (including) 7.20 Added Reference Type VulDB: https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md Types: Exploit, Third Party Advisory Added Reference Type VulDB: https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md#poc Types: Exploit, Third Party Advisory Added Reference Type VulDB: https://vuldb.com/?ctiid.347335 Types: Permissions Required, VDB Entry Added Reference Type VulDB: https://vuldb.com/?id.347335 Types: Third Party Advisory, VDB Entry Added Reference Type VulDB: https://vuldb.com/?submit.757091 Types: Third Party Advisory, VDB Entry -
New CVE Received by [email protected]
Feb. 23, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N Added CVSS V2 (AV:N/AC:H/Au:N/C:N/I:P/A:N) Added CWE CWE-345 Added CWE CWE-347 Added Reference https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md Added Reference https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md#poc Added Reference https://vuldb.com/?ctiid.347335 Added Reference https://vuldb.com/?id.347335 Added Reference https://vuldb.com/?submit.757091