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Advisory record · GHSA-fm4g-76c9-7w69

Http4s: DigestAuth nonce map grows unbounded

CVSS 7.5 HighEPSS 0.0077 · 55th percentile

Published by the GitHub Advisory Database at 15 Sept 2026, 19:54 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.http4s:http4s-ember-server_2.12Maven<0.23.350.23.35
org.http4s:http4s-ember-server_2.13Maven<0.23.35 || >=1.0.0-M1, <1.0.0-M470.23.35, 1.0.0-M47
org.http4s:http4s-ember-server_3Maven<0.23.35 || >=1.0.0-M1, <1.0.0-M470.23.35, 1.0.0-M47
Identifiers
GHSA-fm4g-76c9-7w69 · CVE-2026-69208
Weakness (CWE)
CWE-400 · CWE-401
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.

Http4s DigestAuth server middleware in http4s-ember-server versions before 0.23.35 for Scala 2.12, and versions before 0.23.35 or from 1.0.0-M1 up to but not including 1.0.0-M47 for Scala 2.13 and 3, is affected. A remote, unauthenticated attacker can make the stale-nonce cleanup remove fresh nonces, so the nonce map grows without bound and can exhaust JVM heap, causing a denial of service for any service using DigestAuth. Upgrade to 0.23.35 or 1.0.0-M47, depending on your release line. Rate limiting DigestAuth routes can slow the leak, but restarting periodically is only a temporary measure.

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
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0077, the 55th percentile, on 6 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.