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Advisory record · GHSA-jrpm-956j-96jg

Http4s: Ember chunk parser lenience (TE.TE request smuggling)

CVSS 5.4 MediumEPSS 0.0037 · 30th percentile

Published by the GitHub Advisory Database at 15 Sept 2026, 20:01 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.http4s:http4s-ember-core_2.12Maven<0.23.350.23.35
org.http4s:http4s-ember-core_2.13Maven<0.23.35 || >=1.0.0-M1, <1.0.0-M470.23.35, 1.0.0-M47
org.http4s:http4s-ember-core_3Maven<0.23.35 || >=1.0.0-M1, <1.0.0-M470.23.35, 1.0.0-M47
Identifiers
GHSA-jrpm-956j-96jg · CVE-2026-69216
Weakness (CWE)
CWE-444
Tags
Published
15 Sept 2026
Updated
15 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Affected are the http4s-ember-core packages for Scala 2.12, 2.13 and 3 (Maven org.http4s), with versions below 0.23.35 and, for 2.13 and 3, versions from 1.0.0-M1 up to but not including 1.0.0-M47. Upgrade to 0.23.35 or 1.0.0-M47 as applicable. An unauthenticated remote attacker can send chunked requests with malformed chunk sizes that an intermediary parses differently, enabling request smuggling when ember-server sits behind a keep-alive proxy. The source describes a workaround: configure the intermediary to reject malformed chunk sizes or to re-encode request bodies.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.4 Medium 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0037, the 30th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.