# org.http4s:http4s-blaze-server_2.13 (Maven) vulnerabilities

Source: https://junglewise.ai/threats/technologies/org-http4s-http4s-blaze-server-2-13  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 11 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/org-http4s-http4s-blaze-server-2-13.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 3 vulnerabilities in org.http4s:http4s-blaze-server_2.13 (Maven): 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, CVE-2026-73494, was published on 14 September 2026. Nothing in the last four weeks, down from 1 vulnerability in the four before.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 1
- All time: 3 (0 critical, 0 exploited in the wild)

## About org.http4s:http4s-blaze-server_2.13 (Maven)

A Blaze-based server backend for the http4s functional HTTP library for Scala 2.13.

## Latest org.http4s:http4s-blaze-server_2.13 (Maven) vulnerabilities

- [CVE-2026-73494: http4s blaze HTTP/1.1 parser conformance bypass](https://junglewise.ai/threats/cve-2026-73494-http4s-blaze-http-1-1-parser-conformance-bypass) (high, CVSS 7.4, published 14 Sep 2026)
- [CVE-2026-73493: Http4s blaze-server unbounded WebSocket message aggregation](https://junglewise.ai/threats/cve-2026-73493-http4s-blaze-server-unbounded-websocket-message-aggregation) (high, CVSS 7.5, published 12 Aug 2026)
- [CVE-2021-21294: Unbounded connection acceptance in http4s-blaze-server](https://junglewise.ai/threats/cve-2021-21294-unbounded-connection-acceptance-in-http4s-blaze-server) (low, CVSS 3.1, published 2 Feb 2021)

## Most severe org.http4s:http4s-blaze-server_2.13 (Maven) vulnerabilities

- [CVE-2026-73493: Http4s blaze-server unbounded WebSocket message aggregation](https://junglewise.ai/threats/cve-2026-73493-http4s-blaze-server-unbounded-websocket-message-aggregation) (high, CVSS 7.5, published 12 Aug 2026)
- [CVE-2026-73494: http4s blaze HTTP/1.1 parser conformance bypass](https://junglewise.ai/threats/cve-2026-73494-http4s-blaze-http-1-1-parser-conformance-bypass) (high, CVSS 7.4, published 14 Sep 2026)
- [CVE-2021-21294: Unbounded connection acceptance in http4s-blaze-server](https://junglewise.ai/threats/cve-2021-21294-unbounded-connection-acceptance-in-http4s-blaze-server) (low, CVSS 3.1, published 2 Feb 2021)

## Vulnerabilities per week

Nothing in the last four weeks, down from 1 vulnerability in the four before.

| 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 | 1 | 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 |

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- [com.liferay.portal:release.portal.bom (Maven)](https://junglewise.ai/threats/technologies/com-liferay-portal-release-portal-bom): 159 vulnerabilities
- [com.liferay.portal:release.dxp.bom (Maven)](https://junglewise.ai/threats/technologies/com-liferay-portal-release-dxp-bom): 125 vulnerabilities
- [org.keycloak:keycloak-services (Maven)](https://junglewise.ai/threats/technologies/org-keycloak-keycloak-services): 122 vulnerabilities
- [com.fasterxml.jackson.core:jackson-databind (Maven)](https://junglewise.ai/threats/technologies/com-fasterxml-jackson-core-jackson-databind): 86 vulnerabilities
- [org.apache.tomcat.embed:tomcat-embed-core (Maven)](https://junglewise.ai/threats/technologies/org-apache-tomcat-embed-tomcat-embed-core): 83 vulnerabilities
- [org.apache.struts:struts2-core (Maven)](https://junglewise.ai/threats/technologies/org-apache-struts-struts2-core): 60 vulnerabilities
- [org.keycloak:keycloak-core (Maven)](https://junglewise.ai/threats/technologies/org-keycloak-keycloak-core): 57 vulnerabilities
- [org.xwiki.platform:xwiki-platform-oldcore (Maven)](https://junglewise.ai/threats/technologies/org-xwiki-platform-xwiki-platform-oldcore): 46 vulnerabilities
- [org.apache.tomcat:tomcat-catalina (Maven)](https://junglewise.ai/threats/technologies/org-apache-tomcat-tomcat-catalina): 44 vulnerabilities
- [org.elasticsearch:elasticsearch (Maven)](https://junglewise.ai/threats/technologies/org-elasticsearch-elasticsearch): 41 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, "org.http4s:http4s-blaze-server_2.13 (Maven) vulnerabilities", https://junglewise.ai/threats/technologies/org-http4s-http4s-blaze-server-2-13, 11 November 2026.