Istio vulnerabilities: known CVEs & security history
Istio · Cloud / Service Mesh · 28 tracked CVEs · 1 actively exploited · updated June 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Istio release lines — 28 in total, with 1 actively exploited in the wild. A CVE here doesn't mean your version is affected — check Istio's current status and the safe version to run.
Known Istio CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2023-44487⚡ exploited | high | 7.5 | 100% | 2023 |
| CVE-2021-31921 | critical | 9.8 | 1% | 2021 |
| CVE-2021-34824 | high | 8.8 | 2% | 2021 |
| CVE-2021-39155 | high | 8.3 | 1% | 2021 |
| CVE-2021-39156 | high | 8.1 | 1% | 2021 |
| CVE-2022-39388 | high | 7.6 | 0% | 2022 |
| CVE-2026-31837 | high | 7.5 | 0% | 2026 |
| CVE-2022-39278 | high | 7.5 | 1% | 2022 |
| CVE-2022-24726 | high | 7.5 | 2% | 2022 |
| CVE-2022-23635 | high | 7.5 | 2% | 2022 |
| CVE-2020-10739 | high | 7.5 | 2% | 2020 |
| CVE-2019-18817 | high | 7.5 | 1% | 2019 |
| CVE-2019-18836 | high | 7.5 | 2% | 2019 |
| CVE-2019-14993 | high | 7.5 | 2% | 2019 |
| CVE-2019-12995 | high | 7.5 | 2% | 2019 |
| CVE-2019-12243 | high | 7.5 | 1% | 2019 |
| CVE-2020-8843 | high | 7.4 | 1% | 2020 |
| CVE-2020-8595 | high | 7.3 | 3% | 2020 |
| CVE-2022-31045 | high | 7 | 1% | 2022 |
| CVE-2022-21679 | medium | 6.8 | 1% | 2022 |
| CVE-2020-16844 | medium | 6.8 | 1% | 2020 |
| CVE-2021-31920 | medium | 6.5 | 1% | 2021 |
| CVE-2019-25014 | medium | 6.5 | 1% | 2021 |
| CVE-2026-39350 | medium | 5.4 | 0% | 2026 |
| CVE-2026-31838 | medium | 5.3 | 0% | 2026 |
| CVE-2026-41413 | medium | 5 | 0% | 2026 |
| CVE-2022-21701 | medium | 5 | 1% | 2022 |
| CVE-2020-11767 | low | 3.1 | 2% | 2020 |
Is my Istio version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Istio version → · Monitor Istio for new CVEs →
Istio vulnerabilities — frequently asked
How many known vulnerabilities does Istio have?
IsItPatched tracks 28 CVEs for Istio, 1 of which is actively exploited (CISA KEV). 1 is critical-severity and 18 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Istio have any actively-exploited vulnerabilities?
Yes — 1 Istio CVE is in CISA's Known Exploited Vulnerabilities catalog, meaning it is confirmed exploited in the wild. Patch it as a priority.
What is the most severe Istio vulnerability?
Among tracked issues, CVE-2023-44487 (HIGH, CVSS 7.5), which is actively exploited, ranks highest — a Uncontrolled resource consumption weakness.
Is Istio safe to use?
It depends on the version. The latest supported Istio release (1.30.1) clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Istio security status · Istio end-of-life · actively-exploited CVEs. Always verify against Istio's advisories — see our disclaimer.