CVE-2026-35215

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{"affected": [{"affectedData": [{"product": "firebird", "vendor": "FirebirdSQL", "versions": [{"status": "affected", "version": ">= 3.0.0, < 3.0.14"}, {"status": "affected", "version": ">= 4.0.0, < 4.0.7"}, {"status": "affected", "version": ">= 5.0.0, < 5.0.4"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*", "matchCriteriaId": "9A79C5C5-09BC-4F38-8B00-F643818CC87D", "versionEndExcluding": "3.0.14", "versionStartIncluding": "3.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*", "matchCriteriaId": "A4BC24D2-FBF7-4308-9914-6079DBDF88FA", "versionEndExcluding": "4.0.7", "versionStartIncluding": "4.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*", "matchCriteriaId": "938978A3-90BE-4223-BDFC-5310A7C78D9B", "versionEndExcluding": "5.0.4", "versionStartIncluding": "5.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the sdl_desc() function does not validate the length of a decoded SDL descriptor from a slice packet. A zero-length descriptor is later used to calculate the number of slice items, causing a division by zero. An unauthenticated attacker can exploit this by sending a crafted slice packet to crash the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14."}, {"lang": "es", "value": "Firebird es un sistema de gesti\u00f3n de bases de datos relacionales de c\u00f3digo abierto. En versiones anteriores a la 5.0.4, 4.0.7 y 3.0.14, la funci\u00f3n sdl_desc() no valida la longitud de un descriptor SDL decodificado de un paquete de segmento. Un descriptor de longitud cero se utiliza posteriormente para calcular el n\u00famero de elementos de segmento, causando una divisi\u00f3n por cero. Un atacante no autenticado puede explotar esto enviando un paquete de segmento manipulado para bloquear el servidor. Este problema ha sido solucionado en las versiones 5.0.4, 4.0.7 y 3.0.14."}], "id": "CVE-2026-35215", "lastModified": "2026-10-26T22:10:00.163", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-35215", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-20T15:40:04.996968Z", "version": "2.0.3"}}]}, "published": "2026-04-17T20:16:35.240", "references": [{"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-g99w-prq5-29c6"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-369"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.0.0,3.0.14)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.0.0,4.0.7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.0.0,5.0.4)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "firebird", "source": "cna", "vendor": "FirebirdSQL"}, "product": "firebird", "vendor": "firebirdsql"}], "analysis": {"en": {"generated_at": "2026-04-18T17:10:59.550032+00:00", "value": {"mitigation_remediation": ["Update to Firebird 5.0.4 or newer (or the corresponding 4.0.7/3.0.14 releases) and restart the database engine.", "Limit database access to trusted hosts or use firewall rules to block unauthenticated connections to the Firebird port.", "Configure system logging and monitoring to detect unexpected server crashes, and deploy a hotfix or patch as soon as one is released."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service via Division by Zero"}, "threat_synthesis": {"affected_systems": "FirebirdSQL Firebird is affected in all releases prior to 5.0.4, 4.0.7 and 3.0.14. The problem is present in the sdl_desc() function used by the database engine and is only mitigated by the corresponding vendor releases.", "description_and_impact": "The vulnerability is a lack of validation for the length of a decoded SDL descriptor received in a slice packet. A zero\u2011length descriptor is later used to compute the number of slice items, triggering a division by zero that crashes the Firebird server and results in a denial of service. The weakness is a classic divide\u2011by\u2011zero error (CWE\u2011369), allowing an attacker to interrupt service without compromising confidentiality or integrity.", "risk_and_exploitability": "The CVSS score of 7.5 indicates a moderate to high severity. The EPSS score is not available, and the vulnerability is not listed in CISA KEV, so there is no publicly known exploit at this time. Nevertheless, the attack is straightforward: an unauthenticated client can send a malicious slice packet over the network to any accessible Firebird instance, causing an immediate service crash. Attackers would benefit from unrestricted network reach to the database port, and no special privileges are required."}}}}, "created": "2026-04-17T20:30:15.692901+00:00", "updated": "2026-04-18T17:15:05.783724+00:00", "vendors": ["firebirdsql", "firebirdsql$PRODUCT$firebird"]}