CVE-2026-2968

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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."}, {"lang": "es", "value": "Se detect\u00f3 una vulnerabilidad en Cesanta Mongoose hasta 7.20 que afecta a la funci\u00f3n mg_chacha20_poly1305_decrypt del archivo /src/tls_chacha20.c del componente Gestor de Etiquetas de Autenticaci\u00f3n Poly1305. Si se manipula se puede lograr una verificaci\u00f3n impropia de la firma criptogr\u00e1fica. El ataque puede lanzarse en remoto. Este ataque se caracteriza por una alta complejidad y es dif\u00edcil de explotar. El exploit ahora es p\u00fablico y puede ser usado. El proveedor fue contactado con anterioridad sobre esta divulgaci\u00f3n, pero no respondi\u00f3 de ninguna manera."}], "id": "CVE-2026-2968", "lastModified": "2026-06-17T10:32:08.283", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "HIGH", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 2.6, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 4.9, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "cna@vuldb.com", "type": "Secondary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "cna@vuldb.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 2.9, "baseSeverity": "LOW", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cna@vuldb.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-2968", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-23T17:26:42.762866Z", "version": "2.0.3"}}]}, "published": "2026-02-23T04:16:02.283", "references": [{"source": "cna@vuldb.com", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md"}, {"source": "cna@vuldb.com", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md#poc"}, {"source": "cna@vuldb.com", "tags": ["Permissions Required", "VDB Entry"], "url": "https://vuldb.com/?ctiid.347335"}, {"source": "cna@vuldb.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/?id.347335"}, {"source": "cna@vuldb.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/?submit.757091"}], "sourceIdentifier": "cna@vuldb.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-345"}, {"lang": "en", "value": "CWE-347"}], "source": "cna@vuldb.com", "type": "Secondary"}]}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.3"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.4"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.5"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.6"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.7"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.8"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.9"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.10"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.11"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.12"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.13"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.14"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.15"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.16"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.17"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.18"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.19"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.20"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Mongoose", "source": "cna", "vendor": "Cesanta"}, "product": "mongoose", "vendor": "cesanta"}], "analysis": {"en": {"generated_at": "2026-04-18T11:09:02.495614+00:00", "value": {"mitigation_remediation": ["Upgrade Cesanta Mongoose to a patched version that resolves the mg_chacha20_poly1305_decrypt verification issue, as documented in Cesanta release notes.", "If upgrading is not immediately possible, reconfigure TLS to use an alternative cipher suite that does not rely on the faulty Poly1305 handler, such as AES-GCM.", "Deploy network segmentation and monitor for anomalous TLS handshake failures, applying rate limiting to mitigate potential brute\u2011force attempts on the authentication tag verification process."], "summary": {"action": "Patch immediately", "impact": "Improper cryptographic signature verification leading to authentication bypass"}, "threat_synthesis": {"affected_systems": "Affected systems include all deployments that incorporate Cesanta Mongoose, specifically version 7.20 and earlier. The flaw impacts any TLS session that relies on the ChaCha20/Poly1305 cipher suite. The CNA list identifies Cesanta:Mongoose as the affected vendor\u2011product pair and no other operating systems or subcomponents are mentioned.", "description_and_impact": "The vulnerability is located in the Poly1305 Authentication Tag Handler function mg_chacha20_poly1305_decrypt within Cesanta Mongoose up to version 7.20. Manipulating the authentication tag causes the function to accept an invalid or forged cryptographic signature as valid, effectively bypassing the authentication mechanism. The flaw is categorized as CWE-345 and CWE-347, indicating improper handling of cryptographic validation that may be exploitable by an attacker to deliver forged data or commands.", "risk_and_exploitability": "Risk and exploitability assessment shows a CVSS score of 6.3, reflecting moderate severity. The EPSS score is below 1%, signaling a low likelihood of widespread exploitation at present. The vulnerability is not listed in the CISA KEV catalog. The attack can be launched remotely by an attacker who can craft an authentication tag with a forged Poly1305 tag, but the exploit is described as difficult, meaning that it requires the ability to generate a valid ChaCha20/Poly1305 payload. Successful exploitation bypasses integrity checks and can lead to unauthorized data processing or command execution within the affected application."}}}}, "created": "2026-02-23T14:28:20.713877+00:00", "updated": "2026-04-18T11:15:35.913914+00:00", "vendors": ["cesanta", "cesanta$PRODUCT$mongoose"]}