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{"cveTags": [], "descriptions": [{"lang": "en", "value": "seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0\nand below, overriding RegExp serialization with extremely large patterns can exhaust JavaScript runtime memory during deserialization. Additionally, overriding RegExp serialization with patterns that trigger catastrophic backtracking can lead to ReDoS (Regular Expression Denial of Service). This issue has been fixed in version 1.4.1."}], "id": "CVE-2026-23956", "lastModified": "2026-01-22T02:15:52.310", "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"}]}, "published": "2026-01-22T02:15:52.310", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060"}, {"source": "security-advisories@github.com", "url": "https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-hx9m-jf43-8ffr"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1333"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "seroval: Seroval: Denial of Service via malicious regular expressions during deserialization", "id": "2431917", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2431917"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1333", "details": ["A flaw was found in seroval, a JavaScript (JS) value stringification library. A remote attacker could exploit this vulnerability by providing specially crafted regular expressions during deserialization. This could lead to the exhaustion of JavaScript runtime memory or trigger a Regular Expression Denial of Service (ReDoS), making the application unavailable to legitimate users."], "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-2026-23956", "public_date": "2026-01-22T01:23:58Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23956\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23956\nhttps://github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060\nhttps://github.com/lxsmnsyc/seroval/security/advisories/GHSA-hx9m-jf43-8ffr"], "statement": "This vulnerability is rated Important for Red Hat as it can lead to a Denial of Service in applications utilizing the `seroval` library. Specifically, versions 1.4.0 and below are susceptible to memory exhaustion or Regular Expression Denial of Service (ReDoS) when processing maliciously crafted serialized regular expressions. This affects community projects such as Forgejo in Fedora and EPEL.", "threat_severity": "Important"}