Application denial of service via unbounded RegExp deserialization
Published Jan 22, 2026 · Updated Jan 22, 2026
Regular expression denial of service in lxsmnsyc seroval 0.2.0 through 1.4.0 allows remote attackers to interrupt applications. The RegExp deserialization path accepts attacker-controlled pattern data without resource bounds, so oversized sources exhaust runtime memory and pathological patterns trigger catastrophic backtracking. Exposure requires an application to deserialize untrusted seroval data with RegExp support enabled; successful input hangs or crashes the hosting JavaScript process without reported data disclosure or modification.
Summary
What happened
Regular expression denial of service in lxsmnsyc seroval 0.2.0 through 1.4.0 allows remote attackers to interrupt applications. The RegExp deserialization path accepts attacker-controlled pattern data without resource bounds, so oversized sources exhaust runtime memory and pathological patterns trigger catastrophic backtracking. Exposure requires an application to deserialize untrusted seroval data with RegExp support enabled; successful input hangs or crashes the hosting JavaScript process without reported data disclosure or modification.
The record
- CVE
- CVE-2026-23956
- Published
- Jan 22, 2026
- Updated
- Jan 22, 2026
- Vendor
- lxsmnsyc
- Product
- seroval
- Classifications
- CWE-1333, T1499.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 22, 2026CVE publishedPublication date reported by the CVE source.
- Jan 22, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 1.4.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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