What is the CVSS score of CVE-2026-23956?

CVE-2026-23956 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of Seroval are affected by CVE-2026-23956?

CVE-2026-23956 presents notable security risk rated CVSS 7.5. Exploitation could compromise the security of affected deployments.. A patch is available.

How to fix or mitigate CVE-2026-23956?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Vendor patch is available.

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 Lxsmnsyc

7.5

CVSS 3.1 · GitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

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. A patch is available in version 1.4.1.

Technical ContextAI

Classified as CWE-1333 (Inefficient Regular Expression Complexity (ReDoS)). Affects Seroval. 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.