TI-2026-56075 Aliases CVE-2026-81176 GHSA-9rgm-9g3h-6x36

Svelte devalue: DoS via malformed input

LOW 31CWE-770Published 2026-09-16 · Updated 2026-09-17

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · Low
Fix status: Partial Red Hat: 3 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-770.

Summary

Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. Prior to 5.9.2, devalue.parse does not reject out-of-bounds indices that are greater than or equal to values.length in src/parse.js. A specially crafted untrusted payload can make the parser alternate between array representations, producing quadratic work as the payload grows and causing denial of service in applications that parse untrusted devalue data. This issue is fixed in version 5.9.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00507 43rd percentileScored 2026-11-07

Fix Partial devalue (sveltejs): 5.9.2devalue (npm): 5.9.2Red Hat: 3 without a fix

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
sveltejs	devalue	before 5.9.2	5.9.2	Patch available	CNA
—	devalue (npm)	before 5.9.2	5.9.2	Patch available	GHSA-9rgm-9g3h-6x36

devalue Vendorsveltejs Affected before 5.9.2 Fixed in 5.9.2 Patch available CNA
devalue (npm) Vendor— Affected before 5.9.2 Fixed in 5.9.2 Patch available GHSA-9rgm-9g3h-6x36

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:svelte:devalue::::::::	—	—	sveltejs

cpe:2.3:a:svelte:devalue:*:*:*:*:*:*:*:* Versions — — ·sveltejs

Remediation

Fix · CNA devalue (sveltejs) Fixed in 5.9.2
Fix · GHSA-9rgm-9g3h-6x36 devalue (npm) Fixed in 5.9.2 Advisory →

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Red Hat Build of Podman Desktop	Affected	No fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)	Affected	No fix yet: Fix deferred
Red Hat Trusted Artifact Signer	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-81176
2026-10-03 Alias added: GHSA-9rgm-9g3h-6x36

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-81176

Other 4

TI-2023-13469 SvelteKit framework has Insufficient CSRF protection for CORS requests CVSS 3.1HIGH 8.8
TI-2023-13464 SvelteKit has Insufficient Cross-Site Request Forgery Protection CVSS 3.1HIGH 8.8
TI-2024-15660 Sending a GET or HEAD request with a body crashes SvelteKit CVSS 3.1HIGH 7.5
TI-2024-30159 Potential mXSS vulnerability due to improper HTML escaping in svelte CVSS 3.1MEDIUM 6.1
TI-2025-23466 SvelteKit allows XSS via tracked search_params CVSS 3.1MEDIUM 5.4
TI-2025-13940 Svelte 5.46.0 - Hydratable Key Script-Breakout XSS (SSR) CVSS 4.0MEDIUM 5.3

See all 50 →

Sources

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