Seroval fromJSON deserializer hangs on crafted sequence, causing DoS
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 1 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-835.
Summary
Seroval versions before 1.6.8 do not validate the done index of sequence nodes in fromJSON and fromCrossJSON (CWE-1284). A crafted done index creates an iterator that never finishes when application code consumes it to completion. An unauthenticated remote attacker can send a request to a service that deserializes untrusted input, blocking the event loop, exhausting process memory, or making the service unavailable.
Written with Claude Haiku 5.5 from the sources below · 2026-10-31
Description from the CNA
Seroval facilitates JavaScript value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.6.8, fromJSON and fromCrossJSON do not validate a sequence node's done index. A crafted done index can create an iterator that never finishes when application code consumes it to completion. An unauthenticated request to a service that deserializes untrusted input can therefore block the event loop, exhaust process memory, or make the service unavailable. This issue is fixed in version 1.6.8.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| lxsmnsyc | seroval | before 1.6.8 | 1.6.8 | Patch available | CNA |
| — | seroval (npm) | before 1.6.8 | 1.6.8 | Patch available | GHSA-97r2-qh9m-474h |
- seroval Vendorlxsmnsyc Affected before 1.6.8 Fixed in 1.6.8 Patch available CNA
- seroval (npm) Vendor— Affected before 1.6.8 Fixed in 1.6.8 Patch available GHSA-97r2-qh9m-474h
Remediation
Upgrade the seroval npm package to version 1.6.8, which fixes the flaw. Red Hat lists Ansible Automation Orchestrator 2026 as affected and has no fix available.
Written with Claude Haiku 5.5 from the sources below · 2026-10-31
- Fix · CNA seroval (lxsmnsyc) Fixed in 1.6.8
- Fix · GHSA-97r2-qh9m-474h seroval (npm) Fixed in 1.6.8 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Ansible Automation Orchestrator 2026 | Affected | No fix yet |
Timeline
- 2026-10-26 Threatist record created from CVE-2026-116581
- 2026-10-27 Affected versions changed · Red Hat
- 2026-10-27 CVSS score added · Red Hat
- 2026-10-27 Priority changed: MEDIUM → LOW
- 2026-10-28 Alias added: GHSA-97r2-qh9m-474h
- 2026-10-28 Fix available: npm/[email protected] · GHSA-97r2-qh9m-474h
- 2026-10-28 CVSS score added · GHSA-97r2-qh9m-474h
- 2026-10-28 Weakness changed · GHSA-97r2-qh9m-474h
- 2026-10-28 6 new references · GHSA-97r2-qh9m-474h
- 2026-10-31 CISA SSVC decision points changed
References
Other 5
- https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-97r2-qh9m-474h
- https://github.com/lxsmnsyc/seroval/commit/e176f9267e59ddd6c9de89cc9fe85c5b37a5b728
- https://github.com/lxsmnsyc/seroval/releases/tag/[email protected]
- https://github.com/lxsmnsyc/seroval/commit/cdcee3e3bc384ee844360844f8ea98fd2b275d69
- https://github.com/lxsmnsyc/seroval
More lxsmnsyc vulnerabilities
- TI-2026-42747 Seroval: `seroval.fromJSON()` Promise resolver type confusion invokes attacker-controlled methods during deserialization CVSS 3.1CRITICAL 9.8
- TI-2026-66132 Seroval: `fromJSON()` Promise thenable assimilation invokes plugin-produced callables (bypass of CVE-2026-59940) CVSS 3.1CRITICAL 9.8
- TI-2026-19109 seroval Affected by Prototype Pollution via JSON Deserialization CVSS 3.1CRITICAL 9.8
- TI-2026-19298 seroval affected by Denial of Service via RegExp serialization CVSS 3.1HIGH 7.5
- TI-2026-80920 Denial of service in Seroval fromJSON via unvalidated array length CVSS 3.1HIGH 7.5
- TI-2026-66131 Seroval: Memory exhaustion via unchecked TypedArray length in JSON deserialization CVSS 3.1HIGH 7.5
Sources
- CVE-2026-116581 · CVE Program
- CVE-2026-116581 · NVD
- FIRST EPSS
- GHSA-97r2-qh9m-474h · GitHub Advisory Database · CC BY 4.0
- CVE-2026-116581 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences