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  5. GHSA-7ppr-r889-mcf2

GHSA-7ppr-r889-mcf2: blaze: Unbounded WebSocket message aggregation in http4s-blaze-server

July 24, 2026

http4s-blaze-server aggregates the fragments of an incoming WebSocket message with no limit on total size or fragment count. A client that completes a WebSocket handshake can send an unterminated fragmented message and drive unbounded heap growth in the server JVM, resulting in denial of service via OutOfMemoryError.

References

  • github.com/advisories/GHSA-7ppr-r889-mcf2
  • github.com/http4s/blaze/commit/173e8ca820a0d12110bfe409c72e9b9c3d28d471
  • github.com/http4s/blaze/commit/2ae13a74d55209b6573d5228d1aa94f0361a75d0
  • github.com/http4s/blaze/commit/fadbe6d0f7f59045425688d313c8d4804973d12f
  • github.com/http4s/blaze/releases/tag/v0.23.18
  • github.com/http4s/blaze/releases/tag/v1.0.0-M42
  • github.com/http4s/blaze/security/advisories/GHSA-7ppr-r889-mcf2

Code Behaviors & Features

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Affected versions

All versions starting from 1.0.0-M1 before 1.0.0-M42

Fixed versions

  • 1.0.0-M42

Solution

Upgrade to version 1.0.0-M42 or above.

Impact 7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Learn more about CVSS

Weakness

  • CWE-770: Allocation of Resources Without Limits or Throttling

Source file

maven/org.http4s/http4s-blaze-server_3/GHSA-7ppr-r889-mcf2.yml

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