CVE-2026-54898

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{"affected": [{"affectedData": [{"product": "oj", "vendor": "ohler55", "versions": [{"status": "affected", "version": "< 3.17.2"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2,Oj::Parser#parse is vulnerable to a heap use-after-free when a SAJ/SAJ2 callback mutates the input JSON string during parsing. The C engine holds a raw const byte * pointer into the Ruby string's internal buffer. If a callback (e.g. hash_start) resizes the string \u2014 for example by calling String#replace with a longer value \u2014 Ruby reallocates the string buffer and frees the old one. The C parser's pointer is left dangling; the next character read at parser.c:607 is a use-after-free. This issue has been fixed in version 3.17.2."}, {"lang": "es", "value": "Oj (Optimized JSON) es un analizador JSON y un serializador de objetos empaquetado como una gema Ruby. En versiones anteriores a la 3.17.2, Oj::Parser#parse es vulnerable a un uso despu\u00e9s de liberaci\u00f3n en el heap cuando una devoluci\u00f3n de llamada SAJ/SAJ2 muta la cadena JSON de entrada durante el an\u00e1lisis. El motor C mantiene un puntero const byte * sin procesar hacia el b\u00fafer interno de la cadena Ruby. Si una devoluci\u00f3n de llamada (por ejemplo, hash_start) redimensiona la cadena - por ejemplo, llamando a String#replace con un valor m\u00e1s largo - Ruby reasigna el b\u00fafer de la cadena y libera el antiguo. El puntero del analizador C queda colgando; el siguiente car\u00e1cter le\u00eddo en parser.c:607 es un uso despu\u00e9s de liberaci\u00f3n. Este problema ha sido solucionado en la versi\u00f3n 3.17.2."}], "id": "CVE-2026-54898", "lastModified": "2026-10-25T17:10:00.197", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 2.1, "baseSeverity": "LOW", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "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:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/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": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54898", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-01T13:36:39.350965Z", "version": "2.0.3"}}]}, "published": "2026-07-01T00:16:33.103", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/ohler55/oj/security/advisories/GHSA-q2gm-54r6-8fwm"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/ohler55/oj/security/advisories/GHSA-q2gm-54r6-8fwm"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "oj: Oj: Denial of Service via input string mutation during JSON parsing", "id": "2495699", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2495699"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2,Oj::Parser#parse is vulnerable to a heap use-after-free when a SAJ/SAJ2 callback mutates the input JSON string during parsing. The C engine holds a raw const byte * pointer into the Ruby string's internal buffer. If a callback (e.g. hash_start) resizes the string \u2014 for example by calling String#replace with a longer value \u2014 Ruby reallocates the string buffer and frees the old one. The C parser's pointer is left dangling; the next character read at parser.c:607 is a use-after-free. This issue has been fixed in version 3.17.2.", "A flaw was found in Oj, a Ruby library designed for efficient JSON (JavaScript Object Notation) parsing. This vulnerability, a heap use-after-free, occurs when a specific function, called a callback, modifies the input JSON string during the parsing process. This action can lead to the program attempting to access memory that has already been freed, potentially causing the application to crash and resulting in a denial of service."], "name": "CVE-2026-54898", "public_date": "2026-06-30T23:24:23Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-54898\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-54898\nhttps://github.com/ohler55/oj/security/advisories/GHSA-q2gm-54r6-8fwm"], "statement": "Red Hat's only product shipping the Oj Ruby gem (Compliance Backend) already includes version 3.17.3, which contains the fix for this vulnerability. No Red Hat products are affected.", "threat_severity": "Moderate"}

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