Resource exhaustion in Http4s Blaze
CVE-2026-73493
Http4s (http4s-blaze-server) is a minimal, idiomatic Scala interface for HTTP services. Prior to 0.23.18 and 1.0.0-M42, http4s-blaze-server aggregates fragments of an incoming WebSocket message with no limit on total size or fragment count…
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Http4s Blaze — versions < 0.23.18, >= 1.0.0-M1, < 1.0.0-M42
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-73493?
- CVE-2026-73493 is a high-severity vulnerability in Http4s Blaze, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-08-12.
- How severe is CVE-2026-73493?
- High severity. CVSS v3 base score is 7.5 out of 10.