Http4s · weakness class
Denial of Service
12 CVEs
Every dot is a CVE in what this vendor ships; the named ones are the most at risk.
Every one of the 12 is a mark on the map. Named now: 1 to 12, most at risk first.
- Unbounded connection acceptance in http4s-blaze-server
- Unbounded connection acceptance leads to file handle exhaustion
- Http4s: DigestAuth nonce map grows unbounded
- Http4s: Ember HTTP/2 buffers a frame's declared payload before checking SETTINGS_MAX_FRAME_SIZE
- http4s-blaze-server: Unbounded WebSocket message aggregation
- Http4s Ember HTTP/2: unbounded continuation frame accumulation
- Http4s Ember HTTP/2: unbounded outbound frame queue
- Http4s: WebSocket decoder accepts negative length, causing infinite decode loop
- Http4s: WebSocket decoder accepts unbounded message sizes
- Http4s Ember HTTP/2: does not enforce SETTINGS_MAX_CONCURRENT_STREAMS
- Http4s Ember HTTP/2: unbounded inbound body buffering
- Http4s: HTTP/2 Denial of Service with Ember Backend
exploited in the wildcheck availableringed, named or not: CyberSIXT has reported on it
Zoom in on the map and the dots under the middle of it are named where they are.
Data as of 2026-11-15. CVE List through 2026-11-15 · EPSS of 2026-11-14 · CISA KEV checked 2026-11-15. Sources: the CVE List, CISA KEV, EPSS, NVD, nuclei templates and public bug bounty data.