# UnJS vulnerabilities

Source: https://junglewise.ai/threats/vendors/unjs  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 11 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/vendors/unjs.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 5 vulnerabilities in UnJS: 0 in the last 7 days and 1 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, H3 denial of service via unbounded chunked cookie count, was published on 6 September 2026. Nothing was published in the last eight weeks. 1 technology has a page of its own.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 1
- All time: 5 (0 critical, 0 exploited in the wild)

## About UnJS

Community organization that develops JavaScript utilities and tools.

## Latest UnJS vulnerabilities

- [H3 denial of service via unbounded chunked cookie count](https://junglewise.ai/threats/duplicate-advisory-h3-unbounded-chunked-cookie-count-in-session-cleanup-11041bf9) (high, CVSS 7.5, published 6 Sep 2026)
- [CVE-2026-44373: Nitro proxy route rule bypass via percent-encoded path traversal](https://junglewise.ai/threats/cve-2026-44373-nitro-proxy-route-rule-bypass-via-percent-encoded-path-traversal) (medium, CVSS 5.3, published 13 May 2026)
- [CVE-2026-44372: Nitro open redirect via protocol-relative URL bypass in wildcard rules](https://junglewise.ai/threats/cve-2026-44372-nitro-open-redirect-via-protocol-relative-url-bypass-in-wildcard) (medium, CVSS 6.1, published 13 May 2026)
- [CVE-2026-39315: Unhead hasDangerousProtocol bypass via padded HTML entities](https://junglewise.ai/threats/cve-2026-39315-unhead-hasdangerousprotocol-bypass-via-padded-html-entities) (medium, CVSS 6.1, published 9 Apr 2026)
- [CVE-2026-35209: unjs defu prototype pollution in defaults merging](https://junglewise.ai/threats/cve-2026-35209-unjs-defu-prototype-pollution-in-defaults-merging) (high, CVSS 7.5, published 6 Apr 2026)

## Most severe UnJS vulnerabilities

- [CVE-2026-35209: unjs defu prototype pollution in defaults merging](https://junglewise.ai/threats/cve-2026-35209-unjs-defu-prototype-pollution-in-defaults-merging) (high, CVSS 7.5, published 6 Apr 2026)
- [H3 denial of service via unbounded chunked cookie count](https://junglewise.ai/threats/duplicate-advisory-h3-unbounded-chunked-cookie-count-in-session-cleanup-11041bf9) (high, CVSS 7.5, published 6 Sep 2026)
- [CVE-2026-44372: Nitro open redirect via protocol-relative URL bypass in wildcard rules](https://junglewise.ai/threats/cve-2026-44372-nitro-open-redirect-via-protocol-relative-url-bypass-in-wildcard) (medium, CVSS 6.1, published 13 May 2026)
- [CVE-2026-39315: Unhead hasDangerousProtocol bypass via padded HTML entities](https://junglewise.ai/threats/cve-2026-39315-unhead-hasdangerousprotocol-bypass-via-padded-html-entities) (medium, CVSS 6.1, published 9 Apr 2026)
- [CVE-2026-44373: Nitro proxy route rule bypass via percent-encoded path traversal](https://junglewise.ai/threats/cve-2026-44373-nitro-proxy-route-rule-bypass-via-percent-encoded-path-traversal) (medium, CVSS 5.3, published 13 May 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 1 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 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 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## UnJS technologies

- [UnJS NitroPack](https://junglewise.ai/threats/technologies/nitropack): 3 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, "UnJS vulnerabilities", https://junglewise.ai/threats/vendors/unjs, 11 November 2026.