Technology · npm
h3 (npm) vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 10 vulnerabilities in h3 (npm): 0 in the last 7 days and 5 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-86253, was published on 6 September 2026.
- Last 7 days
- 0
- Last 90 days
- 5
- Critical, all time
- 0
- Exploited in the wild
- 0
About h3 (npm)
A high-performance HTTP framework and server engine for Node.js.
Latest h3 (npm) vulnerabilities
- CVE-2026-86253: h3 (npm package) versions <= 2.0.1-rc.14 contain a path traversal vulnerability in serveStatic(). On Node.js deployments…mediumCVSS 5.9EPSS 0.6%
- CVE-2026-86252: h3 versions before 1.15.9 fail to sanitize carriage return characters in EventStream data and comment fields, allowing…mediumCVSS 5.3EPSS 0.4%
- CVE-2026-86251: h3 versions before 1.15.9 contain a path traversal vulnerability in the serveStatic utility. A double-decoding flaw allows…mediumCVSS 5.9EPSS 0.4%
- CVE-2026-86250: h3 versions before 2.0.1-rc.18 fail to validate the chunk count parsed from user-controlled cookie values in…highCVSS 7.5EPSS 0.5%
- CVE-2026-86205: h3 versions before 2.0.1-rc.18 contain an open redirect vulnerability in the redirectBack() utility that fails to sanitize…mediumCVSS 5.4EPSS 0.3%
- CVE-2026-33490: h3 missing path segment boundary check in mount()lowCVSS 3.1EPSS 0.3%
- CVE-2026-33131: h3 middleware bypass via Host header spoofinglowCVSS 3.1EPSS 0.4%
- CVE-2026-33129: h3 timing side-channel in basic auth validationlowCVSS 3.1EPSS 0.4%
- CVE-2026-33128: h3 Server-Sent Events injection via unsanitized newlineslowCVSS 3.1EPSS 0.7%
- CVE-2026-23527: h3js h3 HTTP request smuggling in readRawBodyhighCVSS 8.9EPSS 0.6%
Most severe h3 (npm) vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-23527: h3js h3 HTTP request smuggling in readRawBodyhighCVSS 8.9EPSS 0.6%
- CVE-2026-86250: h3 versions before 2.0.1-rc.18 fail to validate the chunk count parsed from user-controlled cookie values in…highCVSS 7.5EPSS 0.5%
- CVE-2026-86253: h3 (npm package) versions <= 2.0.1-rc.14 contain a path traversal vulnerability in serveStatic(). On Node.js deployments…mediumCVSS 5.9EPSS 0.6%
- CVE-2026-86251: h3 versions before 1.15.9 contain a path traversal vulnerability in the serveStatic utility. A double-decoding flaw allows…mediumCVSS 5.9EPSS 0.4%
- CVE-2026-86205: h3 versions before 2.0.1-rc.18 contain an open redirect vulnerability in the redirectBack() utility that fails to sanitize…mediumCVSS 5.4EPSS 0.3%
- CVE-2026-86252: h3 versions before 1.15.9 fail to sanitize carriage return characters in EventStream data and comment fields, allowing…mediumCVSS 5.3EPSS 0.4%
- CVE-2026-33128: h3 Server-Sent Events injection via unsanitized newlineslowCVSS 3.1EPSS 0.7%
- CVE-2026-33129: h3 timing side-channel in basic auth validationlowCVSS 3.1EPSS 0.4%
- CVE-2026-33131: h3 middleware bypass via Host header spoofinglowCVSS 3.1EPSS 0.4%
- CVE-2026-33490: h3 missing path segment boundary check in mount()lowCVSS 3.1EPSS 0.3%
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 0 | 0 | |
| 6 Jul 2026 | 0 | 0 | |
| 13 Jul 2026 | 0 | 0 | |
| 20 Jul 2026 | 0 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 0 | 0 | |
| 10 Aug 2026 | 0 | 0 | |
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 5 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 |
How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/h3.json, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "h3 (npm) vulnerabilities", https://junglewise.ai/threats/technologies/h3, 26 September 2026.