CVE-2026-41873

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Pony Mail", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "*", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "security@apache.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:apache:pony_mail:*:*:*:*:*:*:*:*", "matchCriteriaId": "D1FA9330-7521-4161-837D-856A31916DAB", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [{"sourceIdentifier": "security@apache.org", "tags": ["unsupported-when-assigned"]}], "descriptions": [{"lang": "en", "value": "** UNSUPPORTED WHEN ASSIGNED ** Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Pony Mail leading to admin account takeover.\n\nThis issue affects all versions of the Lua implementation of Pony Mail. There is a Python implementation under development under the name \"Pony Mail Foal\" that is not affected by this issue, but hasn't been released yet.\n\nAs the Lua implementation of this project is retired, we do not plan to release a version that fixes this issue. Users are recommended to find an alternative or restrict access to the instance to trusted users.\n\nNOTE: This vulnerability only affects products that are no longer supported by the maintainer."}, {"lang": "es", "value": "NO SOPORTADO AL ASIGNARSE Vulnerabilidad de interpretaci\u00f3n inconsistente de solicitudes HTTP (\u2019Contrabando de solicitudes/respuestas HTTP\u2019) en Pony Mail que conduce a la toma de control de la cuenta de administrador.\n\nEste problema afecta a todas las versiones de la implementaci\u00f3n en Lua de Pony Mail. Existe una implementaci\u00f3n en Python en desarrollo bajo el nombre \u2019Pony Mail Foal\u2019 que no se ve afectada por este problema, pero a\u00fan no ha sido lanzada.\n\nDado que la implementaci\u00f3n en Lua de este proyecto est\u00e1 retirada, no planeamos lanzar una versi\u00f3n que corrija este problema. Se recomienda a los usuarios que busquen una alternativa o restrinjan el acceso a la instancia a usuarios de confianza.\n\nNOTA: Esta vulnerabilidad solo afecta a productos que ya no son compatibles con el mantenedor."}], "id": "CVE-2026-41873", "lastModified": "2026-10-26T20:10:00.160", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-41873", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-04-29T11:55:16.272926Z", "version": "2.0.3"}}]}, "published": "2026-04-28T16:16:13.670", "references": [{"source": "security@apache.org", "tags": ["Mailing List", "Vendor Advisory"], "url": "https://lists.apache.org/thread/1c7jtxjobh280kqc13fzw1cg57xrz951"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/04/28/17"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-444"}], "source": "security@apache.org", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Pony Mail", "source": "cna", "vendor": "Apache Software Foundation"}, "product": "pony_mail", "vendor": "apache"}], "analysis": {"en": {"generated_at": "2026-04-28T23:15:35.625836+00:00", "value": {"mitigation_remediation": ["Limit access to the Pony Mail instance to trusted hosts or authenticated administrators, blocking all external traffic that is not authorized.", "Replace the retired Lua-based Pony Mail with a supported mail server solution, such as Postfix, Sendmail, or another active project.", "Apply network level filtering or use a Web Application Firewall that blocks HTTP request smuggling patterns to prevent exploitation, if the service must remain online temporarily."], "summary": {"action": "Restrict Access", "impact": "Admin account takeover via HTTP request smuggling"}, "threat_synthesis": {"affected_systems": "The problem affects the deprecated Lua version of Pony Mail from the Apache Software Foundation; all versions released before retirement are impacted. The Python implementation, known as Pony Mail Foal, is not affected, but it has not yet been released. Because the Lua implementation is no longer maintained, there are no vendor patches or updates available.", "description_and_impact": "The vulnerability is caused by inconsistent interpretation of HTTP requests in the retired Lua implementation of Apache Pony Mail, allowing an attacker to smuggle HTTP requests and gain administrative privileges. This flaw is classified as CWE-444 and would let an attacker fully compromise the administrative control of the mail server, affecting confidentiality, integrity, and availability.", "risk_and_exploitability": "The exploit allows remote privilege escalation to full admin rights, making the risk very high. The CVSS score of 9.8 reflects the very high risk. No EPSS score is available and the vulnerability is not listed in the CISA KEV catalog, indicating that public exploit data may be limited, but the potential impact remains severe. Attackers would need the ability to send crafted HTTP requests to the mail server, typically a remote network attacker. Without an official fix, the threat persists until the product is removed or replaced."}}}}, "created": "2026-04-28T18:00:13.436046+00:00", "updated": "2026-04-28T23:15:43.859826+00:00", "vendors": ["apache", "apache$PRODUCT$pony_mail"]}