CVE-2026-23737

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{"affected": [{"affectedData": [{"product": "seroval", "vendor": "lxsmnsyc", "versions": [{"status": "affected", "version": "< 1.4.1"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:lxsmnsyc:seroval:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "85760E40-9AB1-40EB-98A1-D1A4411AAFC5", "versionEndExcluding": "1.4.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0 and below, improper input handling in the JSON deserialization component can lead to arbitrary JavaScript code execution. Exploitation is possible via overriding constant value and error deserialization, allowing indirect access to unsafe JS evaluation. At minimum, attackers need the ability to perform 4 separate requests on the same function, and partial knowledge of how the serialized data is used during later runtime processing. This vulnerability affects the fromJSON and fromCrossJSON functions in a client-to-server transmission scenario. This issue has been fixed in version 1.4.0."}, {"lang": "es", "value": "seroval facilita la serializaci\u00f3n de valores JS, incluyendo estructuras complejas m\u00e1s all\u00e1 de las capacidades de JSON.stringify. En las versiones 1.4.0 e inferiores, un manejo inadecuado de la entrada en el componente de deserializaci\u00f3n JSON puede llevar a la ejecuci\u00f3n arbitraria de c\u00f3digo JavaScript. Es posible explotarlo mediante la anulaci\u00f3n de la deserializaci\u00f3n de valores constantes y errores, permitiendo el acceso indirecto a la evaluaci\u00f3n JS insegura. Como m\u00ednimo, los atacantes necesitan la capacidad de realizar 4 solicitudes separadas en la misma funci\u00f3n, y un conocimiento parcial de c\u00f3mo se utilizan los datos serializados durante el procesamiento posterior en tiempo de ejecuci\u00f3n. Esta vulnerabilidad afecta a las funciones fromJSON y fromCrossJSON en un escenario de transmisi\u00f3n de cliente a servidor. Este problema ha sido solucionado en la versi\u00f3n 1.4.0."}], "id": "CVE-2026-23737", "lastModified": "2026-06-17T10:22:01.340", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23737", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-01-22T21:54:58.352664Z", "version": "2.0.3"}}]}, "published": "2026-01-21T23:15:52.493", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-3rxj-6cgf-8cfw"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-502"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "seroval: seroval: Arbitrary Code Execution via Improper JSON Deserialization", "id": "2431896", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2431896"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-502", "details": ["A flaw was found in seroval, a JavaScript library designed to convert complex data into a string format. This vulnerability exists within the library's JSON deserialization process, which is responsible for converting string data back into usable objects. A remote attacker can exploit improper input handling in the `fromJSON` and `fromCrossJSON` functions to execute arbitrary JavaScript code. Successful exploitation requires the attacker to make multiple specific requests and possess some understanding of how the serialized data is processed, ultimately leading to unauthorized control over the affected system."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-23737", "public_date": "2026-01-21T23:09:34Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23737\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23737\nhttps://github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060\nhttps://github.com/lxsmnsyc/seroval/security/advisories/GHSA-3rxj-6cgf-8cfw"], "statement": "This vulnerability is rated Important for Red Hat. The `seroval` library, used in components like `forgejo` in Fedora and EPEL, is susceptible to remote code execution through improper JSON deserialization. Exploitation requires an attacker to perform multiple requests and possess partial knowledge of how serialized data is processed during runtime.", "threat_severity": "Important"}

{"analysis": {"en": {"generated_at": "2026-04-18T15:29:35.613841+00:00", "value": {"mitigation_remediation": ["Upgrade seroval to version 1.4.0 or later, which patches the deserialization bug.", "Apply authentication and rate limiting to any endpoints that use seroval\u2019s fromJSON or fromCrossJSON to reduce the chance of multi\u2011step exploitation.", "Review server\u2011side code that executes or evals deserialized data and harden or remove unsafe evaluation paths."], "summary": {"action": "Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "The product affected is seroval provided by lxsmnsyc, with vulnerable releases equal to or older than version 1.4.0, used in Node.js applications that perform client\u2011to\u2011server transmissions with seroval's fromJSON and fromCrossJSON functions.", "description_and_impact": "Seroval enables advanced JavaScript value stringification beyond standard JSON.stringify, but in versions 1.4.0 and earlier it improperly handles input during JSON deserialization. This flaw, a deserialization of untrusted data vulnerability (CWE\u2011502), allows an attacker to craft payloads that, when processed by the fromJSON or fromCrossJSON functions in a client\u2011to\u2011server context, can cause arbitrary JavaScript code to run. The vulnerability requires an attacker to execute four separate requests on the same deserialization function and requires partial knowledge of how the serialized data is later used; successful exploitation would grant the attacker full control over the environment, compromising confidentiality, integrity, and availability of the affected system.", "risk_and_exploitability": "The CVSS score of 7.5 indicates high severity, but the EPSS score is reported as <1%, suggesting the likelihood of exploitation remains low. The vulnerability is not listed in the CISA KEV catalog, and the attacker requires remote access, four staged requests, and knowledge of the serialization format, meaning that operational security controls such as authentication and request rate limiting could mitigate exploitation risk."}}}}, "created": "2026-01-22T10:08:26.154045+00:00", "updated": "2026-04-18T15:30:03.969503+00:00", "vendors": ["lxsmnsyc", "lxsmnsyc$PRODUCT$seroval"]}