lxsmnsyc seroval up to 1.4.0 Regular Expression redos

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability has been found in lxsmnsyc seroval up to 1.4.0 and classified as problematic. This affects an unknown part of the component Regular Expression Handler. This manipulation causes redos. The identification of this vulnerability is CVE-2026-23956. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic was found in lxsmnsyc seroval up to 1.4.0. Affected by this vulnerability is an unknown part of the component Regular Expression Handler. The manipulation with an unknown input leads to a redos vulnerability. The CWE definition for the vulnerability is CWE-1333. The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. As an impact it is known to affect availability. The summary by CVE is:

seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 0.2.0 through 1.4.0, 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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-23956 since 01/19/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1449.003 for this issue.

Upgrading to version 1.4.1 eliminates this vulnerability. Applying the patch ce9408ebc87312fcad345a73c172212f2a798060 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Redos
CWE: CWE-1333 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: seroval 1.4.1
Patch: ce9408ebc87312fcad345a73c172212f2a798060

Timelineinfo

01/19/2026 CVE reserved
01/22/2026 +3 days Advisory disclosed
01/22/2026 +0 days VulDB entry created
05/20/2026 +118 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-hx9m-jf43-8ffr
Status: Confirmed

CVE: CVE-2026-23956 (🔒)
GCVE (CVE): GCVE-0-2026-23956
GCVE (VulDB): GCVE-100-342289

Entryinfo

Created: 01/22/2026 08:11
Updated: 05/20/2026 05:46
Changes: 01/22/2026 08:11 (67), 05/20/2026 05:46 (2)
Complete: 🔍
Cache ID: 216::103

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