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Advisory record · GHSA-856q-xv3c-7f2f

Unauthenticated control plane denial of service attack in Istio

CVSS 7.5 HighEPSS 0.017 · 76th percentile

Published by the GitHub Advisory Database at 23 Feb 2022, 14:59 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
istio.io/istioGo>=1.13.0, <1.13.1 || >=1.12.0, <1.12.4 || <1.11.71.13.1, 1.12.4, 1.11.7
Identifiers
GHSA-856q-xv3c-7f2f · CVE-2022-23635
Weakness (CWE)
CWE-287 · CWE-1284
Tags
Published
23 Feb 2022
Updated
10 Sept 2026

Machine-written summary

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

Istio (Go module istio.io/istio) versions before 1.11.7, from 1.12.0 up to but not including 1.12.4, and from 1.13.0 up to but not including 1.13.1 are affected. An unauthenticated attacker who can reach the control plane's TLS port 15012 can send a specially crafted message that crashes istiod. Upgrade to 1.11.7, 1.12.4, or 1.13.1 or later; no workaround other than upgrading is given, though limiting network access to istiod can reduce exposure.

Written 6 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 0.017, the 76th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:45 UTC First seen by agentprime
  2. 31 Oct 2026, 14:45 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.