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  5. GHSA-mhvj-jhpq-885v

GHSA-mhvj-jhpq-885v: blaze: Multiple HTTP/1.1 request-smuggling primitives in blaze's Java wire parser

July 24, 2026

Five independent HTTP/1.1 conformance laxities in blaze’s hand-written Java parser (http/src/main/java/org/http4s/blaze/http/parser/) cause request-boundary disagreement with a stricter intermediary. All are reachable from a default BlazeServerBuilder with no non-default configuration.

References

  • github.com/advisories/GHSA-mhvj-jhpq-885v
  • github.com/http4s/blaze/commit/3f7c022e306631b006dcb43a1d7f65c0d1966f17
  • github.com/http4s/blaze/commit/4eec2007806aa9acfefb00ebb636ddc39a147a96
  • github.com/http4s/blaze/commit/927b67753a78c13c4445dac9307f511f5c4878c3
  • github.com/http4s/blaze/commit/a54bc9cd31758335c7f24e29763622fd03fcf734
  • github.com/http4s/blaze/commit/c47d9675f87603f11b32a11d503626bdf9be5c7a
  • github.com/http4s/blaze/commit/e871ebb1d27f50c98fd56988526ce42d0fee74d6
  • 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-mhvj-jhpq-885v

Code Behaviors & Features

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Affected versions

All versions before 0.23.18, all versions starting from 1.0.0-M1 before 1.0.0-M42

Fixed versions

  • 0.23.18
  • 1.0.0-M42

Solution

Upgrade to versions 0.23.18, 1.0.0-M42 or above.

Impact 7.4 HIGH

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

Learn more about CVSS

Weakness

  • CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Source file

maven/org.http4s/blaze-http_3/GHSA-mhvj-jhpq-885v.yml

Spotted a mistake? Edit the file on GitLab.

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