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Advisory record · GHSA-wv64-j4fq-5f9x

Http4s: CookieJar middleware accepts arbitrary Set-Cookie domain

CVSS 6.8 MediumEPSS 0.0040 · 33rd percentile

Published by the GitHub Advisory Database at 15 Sept 2026, 20:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.http4s:http4s-client_2.12Maven<0.23.350.23.35
org.http4s:http4s-client_2.13Maven<0.23.35 || >=1.0.0-M1, <1.0.0-M470.23.35, 1.0.0-M47
org.http4s:http4s-client_3Maven>=1.0.0-M1, <1.0.0-M47 || <0.23.351.0.0-M47, 0.23.35
Identifiers
GHSA-wv64-j4fq-5f9x · CVE-2026-69214
Weakness (CWE)
CWE-384 · CWE-565
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.

The http4s-client package is affected in several version ranges: below 0.23.35 for the 2.12 and 2.13 builds, 1.0.0-M1 up to 1.0.0-M47 for the 2.13 and 3 builds, and below 0.23.35 for the 3 build. The CookieJar client middleware accepts a Domain attribute from a server's Set-Cookie header without checking that it matches the sending host. A malicious or compromised server can plant cookies for other domains in the same jar, enabling session fixation or overwriting of security-relevant cookies. Upgrade to 0.23.35 or 1.0.0-M47. Avoid sharing one CookieJar between trusted and untrusted servers.

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
6.8 Medium 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0040, the 33rd 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.