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Medium, CVSS 5.4

Istio: AuthorizationPolicy serviceAccounts regex injection via unescaped dots

CVE-2026-39350GHSA-9gcg-w975-3rjh

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (istio.io/istio 0.0.0-20260403004500-692e460c342d), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Go istio.io/istio

    Affected
    >= 0.0.0-20241024090207-0bf27d49ba4b, < 0.0.0-20260403004500-692e460c342d
    Fixed in
    0.0.0-20260403004500-692e460c342d

Sources

  • GitHub Advisory Database and maintainer security advisories on GitHub

    GitHub-reviewed advisory GHSA-9gcg-w975-3rjh lists affected ranges: Go istio.io/istio >=0.0.0-20241024090207-0bf27d49ba4b <0.0.0-20260403004500-692e460c342d

    VerifiedObserved Structured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.4 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
EPSS
  • CVE-2026-39350: 0.21% estimated exploitation activity in the next 30 days; percentile 11.13 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact The serviceAccounts and notServiceAccounts fields in AuthorizationPolicy incorrectly interpret dots (.) as a regular expression matcher. Because . is a valid character in a service account name, an AuthorizationPolicy ALLOW rule targeting SA e.g. cert-manager.io also matches cert-manager-io, cert-managerXio, etc. A DENY rule targeting the same name fails to block those variants. Patches Fixes are available in 1.29.2, 1.28.6, and 1.27.9 Workarounds None

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-9gcg-w975-3rjh

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-39350

Advisory: Istio: AuthorizationPolicy serviceAccounts regex injection via unescaped dots
IDs: CVE-2026-39350, GHSA-9gcg-w975-3rjh
Record: https://patchnext.com/advisories/cve-2026-39350 (revision 1, source checked 26 Oct 2026, 15:19 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: istio.io/istio 0.0.0-20260403004500-692e460c342d. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go istio.io/istio: affected >= 0.0.0-20241024090207-0bf27d49ba4b, < 0.0.0-20260403004500-692e460c342d; fixed in 0.0.0-20260403004500-692e460c342d

## Suggested inspection (read-only)
- Go istio.io/istio: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on istio.io/istio.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-9gcg-w975-3rjh (GitHub-reviewed advisory GHSA-9gcg-w975-3rjh lists affected ranges: Go istio.io/istio >=0.0.0-20241024090207-0bf27d49ba4b <0.0.0-20260403004500-692e460c342d)

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