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.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

Access Vector Network

Access Complexity High

Authentication None

Confidentiality Impact None

Integrity Impact Partial

Availability Impact None

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Cesanta Mongoose affected
Version Status Constraints
7.0 affected —
7.1 affected —
7.2 affected —
7.3 affected —
7.4 affected —
7.5 affected —
7.6 affected —
7.7 affected —
7.8 affected —
7.9 affected —
7.10 affected —
7.11 affected —
7.12 affected —
7.13 affected —
7.14 affected —
7.15 affected —
7.16 affected —
7.17 affected —
7.18 affected —
7.19 affected —
7.20 affected —

No data.

No data.

No data.

Project Subscriptions

Vendors Products
Cesanta Subscribe
Mongoose Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md cve-icon cve-icon
https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md#poc cve-icon cve-icon
https://vuldb.com/?ctiid.347335 cve-icon cve-icon
https://vuldb.com/?id.347335 cve-icon cve-icon
https://vuldb.com/?submit.757091 cve-icon cve-icon
History

Mon, 23 Feb 2026 03:30:00 +0000

Type Values Removed Values 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.
Title Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c mg_chacha20_poly1305_decrypt signature verification
First Time appeared Cesanta
Cesanta mongoose
Weaknesses CWE-345
CWE-347
CPEs cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*
Vendors & Products Cesanta
Cesanta mongoose
References
Metrics cvssV2_0

{'score': 2.6, 'vector': 'AV:N/AC:H/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:UR'}

cvssV3_0

{'score': 3.7, 'vector': 'CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R'}

cvssV3_1

{'score': 3.7, 'vector': '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'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-02-23T03:02:07.673Z

Reserved: 2026-02-22T07:57:31.932Z

Link: CVE-2026-2968

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-02-23T04:16:02.283

Modified: 2026-02-23T04:16:02.283

Link: CVE-2026-2968

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses