# Sveltejs vulnerabilities

Source: https://junglewise.ai/threats/vendors/sveltejs  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/vendors/sveltejs.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 7 vulnerabilities in Sveltejs: 6 in the last 7 days and 7 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-123569, was published on 8 November 2026. 6 vulnerabilities in the last four weeks, up 500% on the four before (1). 1 technology has a page of its own.

## Counts

- Last 7 days: 6
- Last 30 days: 6
- Last 90 days: 7
- All time: 7 (0 critical, 0 exploited in the wild)

## About Sveltejs

Company that develops and maintains Svelte, a JavaScript framework for building user interfaces.

## Latest Sveltejs vulnerabilities

- [CVE-2026-123569: devalue sparse array denial of service via CPU and memory exhaustion](https://junglewise.ai/threats/cve-2026-123569-the-devalue-package-for-npm-before-5-6-3-can-consume-excessive) (high, CVSS 7.5, published 8 Nov 2026)
- [CVE-2026-123568: Sveltejs devalue prototype pollution in uneval](https://junglewise.ai/threats/cve-2026-123568-sveltejs-devalue-before-5-6-3-contains-a-prototype-pollution) (medium, CVSS 4.4, published 8 Nov 2026)
- [CVE-2026-123566: Sveltejs devalue denial of service in uneval](https://junglewise.ai/threats/cve-2026-123566-sveltejs-devalue-before-5-9-3-contains-a-denial-of-service) (high, CVSS 7.5, published 8 Nov 2026)
- [CVE-2026-123565: Sveltejs devalue resource exhaustion in uneval](https://junglewise.ai/threats/cve-2026-123565-sveltejs-devalue-before-5-9-3-contains-a-resource-exhaustion) (high, CVSS 7.5, published 8 Nov 2026)
- [CVE-2026-123564: Sveltejs devalue memory exhaustion in uneval sparse arrays](https://junglewise.ai/threats/cve-2026-123564-sveltejs-devalue-from-1-0-0-before-5-9-3-contains-a-memory) (high, CVSS 7.5, published 8 Nov 2026)
- [CVE-2026-123562: devalue unhandled promise rejection in stringifyAsync](https://junglewise.ai/threats/cve-2026-123562-devalue-sveltejs-devalue-5-8-0-before-5-9-3-contains-an) (high, CVSS 7.5, published 8 Nov 2026)
- [devalue ArrayBuffer allocation bypass via custom reviver](https://junglewise.ai/threats/devalue-custom-arraybuffer-revivers-can-bypass-typed-array-allocation-ecd9322f) (high, CVSS 4, published 1 Oct 2026)

## Most severe Sveltejs vulnerabilities

- [CVE-2026-123569: devalue sparse array denial of service via CPU and memory exhaustion](https://junglewise.ai/threats/cve-2026-123569-the-devalue-package-for-npm-before-5-6-3-can-consume-excessive) (high, CVSS 7.5, published 8 Nov 2026)
- [CVE-2026-123566: Sveltejs devalue denial of service in uneval](https://junglewise.ai/threats/cve-2026-123566-sveltejs-devalue-before-5-9-3-contains-a-denial-of-service) (high, CVSS 7.5, published 8 Nov 2026)
- [CVE-2026-123565: Sveltejs devalue resource exhaustion in uneval](https://junglewise.ai/threats/cve-2026-123565-sveltejs-devalue-before-5-9-3-contains-a-resource-exhaustion) (high, CVSS 7.5, published 8 Nov 2026)
- [CVE-2026-123564: Sveltejs devalue memory exhaustion in uneval sparse arrays](https://junglewise.ai/threats/cve-2026-123564-sveltejs-devalue-from-1-0-0-before-5-9-3-contains-a-memory) (high, CVSS 7.5, published 8 Nov 2026)
- [CVE-2026-123562: devalue unhandled promise rejection in stringifyAsync](https://junglewise.ai/threats/cve-2026-123562-devalue-sveltejs-devalue-5-8-0-before-5-9-3-contains-an) (high, CVSS 7.5, published 8 Nov 2026)
- [devalue ArrayBuffer allocation bypass via custom reviver](https://junglewise.ai/threats/devalue-custom-arraybuffer-revivers-can-bypass-typed-array-allocation-ecd9322f) (high, CVSS 4, published 1 Oct 2026)
- [CVE-2026-123568: Sveltejs devalue prototype pollution in uneval](https://junglewise.ai/threats/cve-2026-123568-sveltejs-devalue-before-5-6-3-contains-a-prototype-pollution) (medium, CVSS 4.4, published 8 Nov 2026)

## Vulnerabilities per week

6 vulnerabilities in the last four weeks, up 500% on the four before (1).

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 1 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 6 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Sveltejs technologies

- [Sveltejs Devalue](https://junglewise.ai/threats/technologies/sveltejs-devalue): 7 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Sveltejs vulnerabilities", https://junglewise.ai/threats/vendors/sveltejs, 9 November 2026.