Vendor
Http4s vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 26 vulnerabilities in Http4s: 1 in the last 7 days and 26 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. 3 technologies have a page of their own.
- Last 7 days
- 1
- Last 90 days
- 26
- 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 provides `EntityDecoder[F, scala.xml.Elem]` instances that parse XML message bodies. Prior to versions…criticalCVSS 9.3EPSS 0.3%
- CVE-2026-88975: Http4s is a Scala interface for HTTP services. Prior to 0.23.37 and 1.0.0-M48, Ember’s HTTP/2 read loop parses a frame’s…highCVSS 7.5EPSS 0.6%
- CVE-2026-69218: Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, When Ember receives an HTTP/2 HEADERS or…highCVSS 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 is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, The CookieJar client middleware uses…mediumCVSS 6.8EPSS 0.5%
- CVE-2026-69210: Http4s WebSocket decoder negative length handling denial of servicehighCVSS 7.5EPSS 0.6%
- CVE-2026-69206: Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, DigestAuth replay protection records lastNc…mediumCVSS 5.9EPSS 0.4%
- CVE-2026-69205: Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HeaderP.parse uses a case-sensitive…highCVSS 8.7EPSS 0.5%
- CVE-2026-69203: Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, An Ember server with HTTP/2 enabled through…highCVSS 7.5EPSS 0.6%
- CVE-2026-69202: Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HTTP/2 flow-control window is…highCVSS 7.5EPSS 0.6%
- CVE-2026-69216: Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s chunk decoder trims the chunk-size…mediumCVSS 5.4EPSS 0.4%
- CVE-2026-69214: Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, The CookieJar client middleware stores a…mediumCVSS 6.8EPSS 0.4%
- CVE-2026-69213: Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember HTTP/2 serializes outbound frames…highCVSS 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 is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, the DigestAuth server middleware removes…highCVSS 7.5EPSS 0.8%
- CVE-2026-69204: Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember HTTP/1.1 does not reject messages…criticalCVSS 9.2EPSS 0.6%
- CVE-2026-69201: Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, ResourceService and WebjarService decode…mediumCVSS 5.9EPSS 0.8%
- CVE-2026-73494: http4s blaze HTTP/1.1 parser conformance bypasshighCVSS 7.4EPSS 0.6%
- CVE-2026-54556: Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, an unauthenticated HTTP/2 peer can cause an…highCVSS 8.2EPSS 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%
- http4s blaze-server Denial of Service via Unbounded WebSocket AggregationhighCVSS 7.5
- http4s blaze-server header sanitization bypass via chunked trailershighCVSS 7.4
Most severe Http4s vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-61741: http4s-scala-xml provides `EntityDecoder[F, scala.xml.Elem]` instances that parse XML message bodies. Prior to versions…criticalCVSS 9.3EPSS 0.3%
- CVE-2026-69204: Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember HTTP/1.1 does not reject messages…criticalCVSS 9.2EPSS 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 is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HeaderP.parse uses a case-sensitive…highCVSS 8.7EPSS 0.5%
- CVE-2026-54556: Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, an unauthenticated HTTP/2 peer can cause an…highCVSS 8.2EPSS 0.5%
- CVE-2026-69208: Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, the DigestAuth server middleware removes…highCVSS 7.5EPSS 0.8%
- CVE-2026-88975: Http4s is a Scala interface for HTTP services. Prior to 0.23.37 and 1.0.0-M48, Ember’s HTTP/2 read loop parses a frame’s…highCVSS 7.5EPSS 0.6%
- CVE-2026-69218: Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, When Ember receives an HTTP/2 HEADERS or…highCVSS 7.5EPSS 0.6%
- CVE-2026-69210: Http4s WebSocket decoder negative length handling denial of servicehighCVSS 7.5EPSS 0.6%
- CVE-2026-69203: Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, An Ember server with HTTP/2 enabled through…highCVSS 7.5EPSS 0.6%
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 | 3 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 0 | 0 | |
| 10 Aug 2026 | 2 | 0 | |
| 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 |
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, 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, 26 September 2026.