Bug 2441861 (CVE-2026-2968)

Summary: CVE-2026-2968 mongoose: Cesanta Mongoose: Improper cryptographic signature verification in Poly1305 Authentication Tag Handler
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Cesanta Mongoose. A remote attacker could exploit a vulnerability in the `mg_chacha20_poly1305_decrypt` function within the Poly1305 Authentication Tag Handler. This improper verification of cryptographic signatures could allow an attacker to bypass integrity checks, potentially leading to data manipulation.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2441873, 2441874, 2441875, 2441876, 2441877, 2441878, 2441879    
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Description OSIDB Bzimport 2026-02-23 04:01:22 UTC 
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.