EUVD-2026-77697
GHSA-mhvj-jhpq-885v
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Primary rating from Vendor (GitHub_M) · only source for this CVE.
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
3Blast Radius
ecosystem impact- 10 maven packages depend on org.http4s:http4s-blaze-server_2.13 (4 direct, 6 indirect)
Ecosystem-wide dependent count for version 0.23.18.
DescriptionCVE.org
blaze is a Scala library for building asynchronous pipelines, with a focus on network IO. Prior to 0.23.18 and from 1.0.0-M1 until 1.0.0-M42, five HTTP/1.1 conformance laxities in the hand-written Java parser under http/src/main/java/org/http4s/blaze/http/parser/ can cause blaze to derive a different request boundary than a stricter fronting intermediary. A default BlazeServerBuilder accepts invalid or valueless header field names that violate tchar syntax, obsolete folded field lines (obs-fold), unsupported Transfer-Encoding values, duplicate Content-Length fields, and requests containing both Transfer-Encoding and Content-Length. If a lenient or legacy proxy forwards the malformed bytes but interprets them differently, the disagreement can permit front-end authorization bypass, response-queue poisoning on pooled backend connections, or cache poisoning. Exploitation requires a pair of disagreeing parsers; no non-default blaze configuration is required. The affected checks are enforced in BodyAndHeaderParser and Http1ServerParser. This issue is fixed in versions 0.23.18 and 1.0.0-M42.
AnalysisAI
HTTP/1.1 request smuggling in http4s blaze allows a remote client to desynchronize message boundaries between blaze's hand-written Java wire parser and a fronting proxy, enabling front-end authorization bypass, response-queue poisoning on pooled backend connections, or cache poisoning. All deployments of blaze prior to 0.23.18, and the 1.0.0 milestone line from 1.0.0-M1 through 1.0.0-M41, are affected via five independent parser laxities that are reachable from a default BlazeServerBuilder with no non-default configuration. …
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External POC / Exploit Code
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