GHSA-9GCG-W975-3RJH

Vulnerability from github – Published: 2026-04-16 20:44 – Updated: 2026-04-16 20:44
VLAI?
Summary
Istio: AuthorizationPolicy serviceAccounts regex injection via unescaped dots
Details

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

Severity ?
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "istio.io/istio"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-20241024090207-0bf27d49ba4b"
            },
            {
              "fixed": "0.0.0-20260403004500-692e460c342d"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-39350"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-185"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-16T20:44:46Z",
    "nvd_published_at": "2026-04-15T23:16:09Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nThe `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.\n\n### Patches\nFixes are available in 1.29.2, 1.28.6, and 1.27.9\n\n### Workarounds\nNone",
  "id": "GHSA-9gcg-w975-3rjh",
  "modified": "2026-04-16T20:44:46Z",
  "published": "2026-04-16T20:44:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/istio/istio/security/advisories/GHSA-9gcg-w975-3rjh"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39350"
    },
    {
      "type": "WEB",
      "url": "https://github.com/istio/istio/commit/692e460c342d8f308a35b6ecbdace47807da8ade"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/istio/istio"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Istio: AuthorizationPolicy serviceAccounts regex injection via unescaped dots"
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.