CVE-2026-54556

unknown

EUVD alias: EUVD-2026-66558

Assigned by CNA: github_m

Published 2026-08-26 · Modified 2026-08-26

Discuss on Community Propose mitigation

CVSS v3

—

CVSS v4 NEW

8.2

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

VIR risk

—

Description

http4s has HTTP/2 Denial of Service with Ember Backend

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

Propose a mitigation on Community Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Package impact

Ecosystem	Package	Vulnerable	Fixed
Maven	org.http4s:http4s-ember-core_2.12	`<0.23.35`	`0.23.35`
Maven	org.http4s:http4s-ember-core_2.13	`>=1.0.0-M1,<1.0.0-M47`	`1.0.0-M47`
Maven	org.http4s:http4s-ember-core_3	`<0.23.35`	`0.23.35`
Maven	org.http4s:http4s-ember-core_3	`>=1.0.0-M1,<1.0.0-M47`	`1.0.0-M47`
Maven	org.http4s:http4s-ember-core_2.13	`<0.23.35`	`0.23.35`

References

CWEs

CWE-409

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.