TI-2026-80919 Aliases CVE-2026-116583 GHSA-f86p-h4j2-7qgj

Code injection in Seroval typed array serialization output

LOW 24CWE-79Published 2026-10-26 · Updated 2026-10-27

Key facts

Attack vector: Network
Privileges required: None
User interaction: Passive
Attack complexity: High
Attack requirements: Present
Impact type: Cross-site scripting, Code execution
Confidentiality · integrity · availability: None · None · None
Fix status: Partial Red Hat: 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-79 and CWE-94.

Summary

Seroval from 1.6.0 before 1.6.11 derives a typed array's constructor name from a property that an own constructor property can replace (CWE-94). If application code copies untrusted properties onto a typed array and then serializes it, the attacker-controlled name is written as executable JavaScript. That code can run in the page that receives the output, and the attack requires user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Seroval facilitates JavaScript value stringification, including complex structures beyond JSON.stringify capabilities. From 1.6.0 until 1.6.11, the JavaScript-output APIs derive a typed array's constructor name from a property on the value that can be replaced by an own constructor property. When application code copies untrusted properties onto a typed array and then passes it to serialize, serializeAsync, crossSerialize, crossSerializeAsync, crossSerializeStream, Serializer, or compileJSON, the attacker-controlled name is written as executable JavaScript and can run in the page receiving the output. This issue is fixed in version 1.6.11.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00268 19th percentileScored 2026-11-07

Fix Partial seroval (lxsmnsyc): 1.6.11seroval (npm): 1.6.11Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
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	1.6.0 to before 1.6.11	1.6.11	Patch available	CNA
—	seroval (npm)	1.6.0 to before 1.6.11	1.6.11	Patch available	GHSA-f86p-h4j2-7qgj

seroval Vendorlxsmnsyc Affected 1.6.0 to before 1.6.11 Fixed in 1.6.11 Patch available CNA
seroval (npm) Vendor— Affected 1.6.0 to before 1.6.11 Fixed in 1.6.11 Patch available GHSA-f86p-h4j2-7qgj

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:lxsmnsyc:seroval::::::::	—	—	lxsmnsyc

cpe:2.3:a:lxsmnsyc:seroval:*:*:*:*:*:*:*:* Versions — — ·lxsmnsyc

Remediation

Upgrade the seroval npm package to version 1.6.11, which fixes the flaw. Red Hat lists Ansible Automation Orchestrator 2026 as affected, and no plan is available for it.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Fix · CNA seroval (lxsmnsyc) Fixed in 1.6.11
Fix · GHSA-f86p-h4j2-7qgj seroval (npm) Fixed in 1.6.11 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Ansible Automation Orchestrator 2026	Affected	No fix yet: Fix deferred

Timeline

2026-10-26 Threatist record created from CVE-2026-116583
2026-10-27 Affected versions changed · Red Hat
2026-10-27 CVSS score added · Red Hat
2026-10-27 CISA SSVC decision points changed
2026-10-28 Alias added: GHSA-f86p-h4j2-7qgj
2026-10-28 Fix available: npm/[email protected] · GHSA-f86p-h4j2-7qgj
2026-10-28 CVSS score added · GHSA-f86p-h4j2-7qgj
2026-10-28 Weakness changed · GHSA-f86p-h4j2-7qgj
2026-10-28 5 new references · GHSA-f86p-h4j2-7qgj

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-116583

Other 4

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-2026-80917 Seroval fromJSON deserializer hangs on crafted sequence, causing DoS CVSS 3.1HIGH 7.5

See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences