EUVD-2026-79176
GHSA-jrpm-956j-96jg
Severity by source
AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Primary rating from Vendor (github) · only source for this CVE.
CVSS VectorVendor: github
Lifecycle Timeline
3Blast Radius
ecosystem impact- 3 maven packages depend on org.http4s:http4s-ember-core_2.12 (2 direct, 1 indirect)
Ecosystem-wide dependent count for version 0.23.35.
DescriptionCVE.org
Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s chunk decoder trims the chunk-size token and accepts leading plus or minus signs instead of requiring one or more hexadecimal digits followed by the required CRLF. When an intermediary forwards chunked data without re-encoding and interprets malformed chunk boundaries differently, an unauthenticated attacker can create TE.TE request smuggling that bypasses intermediary controls, poisons caches, or hijacks the request queue. The same response-path leniency can enable response smuggling against an ember-client used as a gateway when the upstream is malicious or compromised. This issue is fixed in versions 0.23.35 and 1.0.0-M47.
AnalysisAI
Request smuggling in http4s Ember affects ember-core (server and client) before 0.23.35 and 1.0.0-M47 because the chunked decoder trims chunk-size tokens and accepts leading '+' or '-' signs instead of requiring hexadecimal digits followed by the mandatory CRLF. When Ember runs behind an intermediary that forwards chunked bodies without re-encoding and parses chunk boundaries differently, an unauthenticated attacker can achieve TE.TE request smuggling that bypasses intermediary controls, poisons shared caches, or hijacks queued requests; the same response-path leniency enables response smuggling when ember-client is used as a gateway in front of a malicious or compromised upstream. …
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Same weakness CWE-444 – HTTP Request/Response Smuggling
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today