Improper Cryptographic Signature Verification in Cesanta Mongoose Embedded Web Server
CVE-2026-2968

6.3MEDIUM

Key Information:

Vendor

Cesanta

Status
Mongoose
Vendor
CVE Published:
23 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2968?

A vulnerability exists in Cesanta Mongoose versions up to 7.20 that affects the mg_chacha20_poly1305_decrypt function within the Poly1305 Authentication Tag Handler. This issue leads to improper verification of cryptographic signatures, potentially allowing an attacker to exploit this flaw remotely. The complexity of the attack is high, making successful exploitation challenging. Although the vendor was informed about this vulnerability, there has been no response, leaving systems at risk of potential exploitation.

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Affected Version(s)

Mongoose 7.0

Mongoose 7.1

Mongoose 7.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-2968 - Proof of Concept

References

https://vuldb.com/?id.347335
vdb-entrytechnical-description
https://vuldb.com/?ctiid.347335
signaturepermissions-required
https://vuldb.com/?submit.757091
third-party-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

dwbruijn (VulDB User)
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