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Seroval CVE-2026-23956

HIGH
Inefficient Regular Expression Complexity (ReDoS) (CWE-1333)
2026-01-22 security-advisories@github.com GHSA-hx9m-jf43-8ffr
Denial Of Service Deserialization Seroval
7.5
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
Patch released
Feb 27, 2026 - 19:33 nvd
Patch available
CVE Published
Jan 22, 2026 - 02:15 nvd
HIGH 7.5

DescriptionGitHub Advisory

seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0 and 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.

AnalysisAI

Seroval versions 1.4.0 and below allow remote attackers to cause denial of service through maliciously crafted RegExp patterns during deserialization, either by exhausting memory with oversized patterns or triggering catastrophic backtracking (ReDoS). The vulnerability requires no authentication or user interaction and affects any application using the library to deserialize untrusted serialized data. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malicious serialized RegExp object
Exploit
Send to seroval deserializer
Execution
Trigger catastrophic backtracking or memory exhaustion
Impact
Denial of service
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Vulnerability AssessmentAI

Exploitation seroval versions 1.4.0 and below processing untrusted serialized data containing RegExp objects with oversized or pathological patterns. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 7.5 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker could exploit this vulnerability to ReDoS (Regular Expression Denial of Service).
Remediation A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 7 days: Identify all affected systems and apply vendor patches promptly. …

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Vendor StatusVendor

SUSE

Severity: High

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CVE-2026-23956 vulnerability details – vuln.today
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