Bug 2461830 (CVE-2026-6986)

Summary: CVE-2026-6986 mongoose: Mongoose: Improper cryptographic signature verification
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
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 GCM Authentication Tag Handler, specifically within the mg_aes_gcm_decrypt function. This flaw allows for improper verification of cryptographic signatures, which could lead to a bypass of integrity checks. Exploitation of this vulnerability is considered difficult due to its high complexity.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-04-25 17:01:29 UTC 
A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This issue affects the function mg_aes_gcm_decrypt of the file /src/tls_aes128.c of the component GCM Authentication Tag Handler. Such manipulation leads to improper verification of cryptographic signature. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is assessed as difficult. The exploit has been disclosed publicly and may be used. Upgrading to version 7.21 is capable of addressing this issue. It is advisable to upgrade the affected component. VulDB has contacted the vendor early and they confirmed quickly, that this issue got fixed already.