Vendor
Http4s vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 23 vulnerabilities in Http4s: 0 in the last 7 days and 21 in the last 90 days, 2 of them critical and 0 exploited in the wild. The most recent, CVE-2026-61741, was published on 24 September 2026. Nothing in the last four weeks, down from 20 vulnerabilities in the four before. 0 critical against 2. 2 technologies have a page of their own.
- Last 7 days
- 0
- Last 90 days
- 21
- Critical, all time
- 2
- Exploited in the wild
- 0
About Http4s
Typeful, functional, asynchronous HTTP library for Scala.
Http4s technologies
Latest Http4s vulnerabilities
- CVE-2026-61741: http4s-scala-xml XXE vulnerability in EntityDecodercriticalCVSS 9.3EPSS 0.3%
- CVE-2026-88975: Http4s Ember HTTP/2 frame buffering denial of servicehighCVSS 7.5EPSS 0.6%
- CVE-2026-69218: Http4s Ember HTTP/2 unbounded continuation frame accumulationhighCVSS 7.5EPSS 0.6%
- CVE-2026-69217: Http4s Ember HTTP/1.1 parser request smuggling via duplicate Content-LengthhighCVSS 8.7EPSS 0.5%
- CVE-2026-69215: Http4s CookieJar middleware cookie leakage via substring matchingmediumCVSS 6.8EPSS 0.5%
- CVE-2026-69210: Http4s WebSocket decoder negative length handling denial of servicehighCVSS 7.5EPSS 0.6%
- CVE-2026-69206: Http4s DigestAuth replay attack in authorization headermediumCVSS 5.9EPSS 0.4%
- CVE-2026-69205: Http4s Ember HTTP request smuggling via Transfer-Encoding parsinghighCVSS 8.7EPSS 0.5%
- CVE-2026-69203: Http4s Ember HTTP/2 stream limit enforcement bypasshighCVSS 7.5EPSS 0.6%
- CVE-2026-69202: Http4s Ember HTTP/2 unbounded inbound body bufferinghighCVSS 7.5EPSS 0.6%
- CVE-2026-69216: Http4s Ember chunk parser lenience in HTTP request smugglingmediumCVSS 5.4EPSS 0.4%
- CVE-2026-69214: Http4s CookieJar middleware accepts arbitrary Set-Cookie domainmediumCVSS 6.8EPSS 0.4%
- CVE-2026-69213: Http4s Ember HTTP/2 unbounded outbound frame queue denial of servicehighCVSS 7.5EPSS 0.6%
- CVE-2026-69212: Http4s FollowRedirect credential leak on scheme downgrademediumCVSS 5.9EPSS 0.3%
- CVE-2026-69211: Http4s ResponseCookie header injection via unescaped attributesmediumCVSS 4.8EPSS 0.3%
- CVE-2026-69209: http4s WebSocket decoder unbounded message bufferinghighCVSS 7.5EPSS 0.6%
- CVE-2026-69208: Http4s DigestAuth memory exhaustion via unbounded nonce cachehighCVSS 7.5EPSS 0.8%
- CVE-2026-69204: Http4s Ember HTTP request smuggling via Transfer-Encoding and Content-LengthcriticalCVSS 4EPSS 0.6%
- CVE-2026-69201: Http4s ResourceService and WebjarService path traversal via percent-encoded separatorsmediumCVSS 5.9EPSS 0.8%
- CVE-2026-73494: http4s blaze HTTP/1.1 parser conformance bypasshighCVSS 7.4EPSS 0.6%
- CVE-2026-54556: http4s HTTP/2 denial of service in HPACK header compressionhighCVSS 4EPSS 0.5%
- CVE-2026-73495: http4s blaze HTTP/1.1 trailer header injectionhighCVSS 7.4EPSS 0.5%
- CVE-2026-73493: Http4s blaze-server unbounded WebSocket message aggregationhighCVSS 7.5EPSS 0.6%
Most severe Http4s vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-61741: http4s-scala-xml XXE vulnerability in EntityDecodercriticalCVSS 9.3EPSS 0.3%
- CVE-2026-69204: Http4s Ember HTTP request smuggling via Transfer-Encoding and Content-LengthcriticalCVSS 4EPSS 0.6%
- CVE-2026-69217: Http4s Ember HTTP/1.1 parser request smuggling via duplicate Content-LengthhighCVSS 8.7EPSS 0.5%
- CVE-2026-69205: Http4s Ember HTTP request smuggling via Transfer-Encoding parsinghighCVSS 8.7EPSS 0.5%
- CVE-2026-69208: Http4s DigestAuth memory exhaustion via unbounded nonce cachehighCVSS 7.5EPSS 0.8%
- CVE-2026-88975: Http4s Ember HTTP/2 frame buffering denial of servicehighCVSS 7.5EPSS 0.6%
- CVE-2026-69218: Http4s Ember HTTP/2 unbounded continuation frame accumulationhighCVSS 7.5EPSS 0.6%
- CVE-2026-69210: Http4s WebSocket decoder negative length handling denial of servicehighCVSS 7.5EPSS 0.6%
- CVE-2026-69203: Http4s Ember HTTP/2 stream limit enforcement bypasshighCVSS 7.5EPSS 0.6%
- CVE-2026-69202: Http4s Ember HTTP/2 unbounded inbound body bufferinghighCVSS 7.5EPSS 0.6%
Vulnerabilities per week
Nothing in the last four weeks, down from 20 vulnerabilities in the four before. 0 critical against 2. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 1 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 19 | 1 | |
| 21 Sep 2026 | 1 | 1 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 0 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 0 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many Http4s vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/vendors/http4s)<a href="https://junglewise.ai/threats/vendors/http4s"><img src="https://junglewise.ai/threats/vendors/http4s/badge.svg" alt="Http4s vulnerabilities" /></a>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/vendors/http4s.json, and this page as text at https://junglewise.ai/threats/vendors/http4s.md, 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, "Http4s vulnerabilities", https://junglewise.ai/threats/vendors/http4s, 11 November 2026.