Debian vulnerabilities: known CVEs & security history
Debian · Operating System · 306 tracked CVEs · 3 actively exploited · updated August 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Debian release lines — 306 in total, with 3 actively exploited in the wild. A CVE here doesn't mean your version is affected — check Debian's current status and the safe version to run.
Known Debian CVEs
Actively-exploited and most-severe first. Showing the top 80 of 306. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2021-40438⚡ exploited | critical | 9 | 100% | 2021 |
| CVE-2026-31431⚡ exploited | high | 7.8 | 95% | 2026 |
| CVE-2025-38352⚡ exploited | high | 7.8 | 1% | 2025 |
| CVE-2025-39880 | critical | 9.8 | 0% | 2025 |
| CVE-2025-39841 | critical | 9.8 | 0% | 2025 |
| CVE-2025-39703 | critical | 9.8 | 0% | 2025 |
| CVE-2025-39702 | critical | 9.8 | 0% | 2025 |
| CVE-2025-39682 | critical | 9.8 | 0% | 2025 |
| CVE-2025-39673 | critical | 9.8 | 0% | 2025 |
| CVE-2025-38724 | critical | 9.8 | 0% | 2025 |
| CVE-2025-38708 | critical | 9.8 | 0% | 2025 |
| CVE-2025-38561 | critical | 9.8 | 0% | 2025 |
| CVE-2025-38527 | critical | 9.8 | 0% | 2025 |
| CVE-2025-38488 | critical | 9.8 | 0% | 2025 |
| CVE-2025-38476 | critical | 9.8 | 0% | 2025 |
| CVE-2025-38472 | critical | 9.8 | 0% | 2025 |
| CVE-2025-38471 | critical | 9.8 | 0% | 2025 |
| CVE-2025-38439 | critical | 9.8 | 0% | 2025 |
| CVE-2025-38430 | critical | 9.8 | 0% | 2025 |
| CVE-2025-38211 | critical | 9.8 | 0% | 2025 |
| CVE-2025-38075 | critical | 9.8 | 0% | 2025 |
| CVE-2025-37879 | critical | 9.8 | 0% | 2025 |
| CVE-2023-46850 | critical | 9.8 | 2% | 2023 |
| CVE-2022-48174 | critical | 9.8 | 3% | 2023 |
| CVE-2022-37434 | critical | 9.8 | 16% | 2022 |
| CVE-2016-9841 | critical | 9.8 | 8% | 2017 |
| CVE-2025-38552 | critical | 9.4 | 0% | 2025 |
| CVE-2025-38146 | critical | 9.4 | 0% | 2025 |
| CVE-2025-38120 | critical | 9.4 | 0% | 2025 |
| CVE-2025-37959 | critical | 9.4 | 0% | 2025 |
| CVE-2025-38560 | critical | 9.3 | 0% | 2025 |
| CVE-2025-38728 | critical | 9.1 | 0% | 2025 |
| CVE-2025-38365 | critical | 9.1 | 0% | 2025 |
| CVE-2025-39864 | high | 8.8 | 0% | 2025 |
| CVE-2025-39849 | high | 8.8 | 0% | 2025 |
| CVE-2025-39848 | high | 8.8 | 0% | 2025 |
| CVE-2025-39839 | high | 8.8 | 0% | 2025 |
| CVE-2025-39827 | high | 8.8 | 0% | 2025 |
| CVE-2025-39826 | high | 8.8 | 0% | 2025 |
| CVE-2025-39806 | high | 8.8 | 0% | 2025 |
| CVE-2025-38601 | high | 8.8 | 0% | 2025 |
| CVE-2025-38512 | high | 8.8 | 0% | 2025 |
| CVE-2025-38495 | high | 8.8 | 0% | 2025 |
| CVE-2025-38437 | high | 8.8 | 0% | 2025 |
| CVE-2025-38377 | high | 8.8 | 0% | 2025 |
| CVE-2025-38293 | high | 8.8 | 0% | 2025 |
| CVE-2025-38174 | high | 8.8 | 0% | 2025 |
| CVE-2025-38074 | high | 8.8 | 0% | 2025 |
| CVE-2025-38052 | high | 8.8 | 0% | 2025 |
| CVE-2025-37947 | high | 8.8 | 0% | 2025 |
| CVE-2025-37885 | high | 8.8 | 0% | 2025 |
| CVE-2025-37849 | high | 8.8 | 0% | 2025 |
| CVE-2016-9842 | high | 8.8 | 5% | 2017 |
| CVE-2016-9840 | high | 8.8 | 5% | 2017 |
| CVE-2025-37936 | high | 8.7 | 0% | 2025 |
| CVE-2025-38608 | high | 8.6 | 0% | 2025 |
| CVE-2025-38574 | high | 8.6 | 0% | 2025 |
| CVE-2025-39869 | high | 8.4 | 0% | 2025 |
| CVE-2025-39790 | high | 8.4 | 0% | 2025 |
| CVE-2025-39718 | high | 8.4 | 0% | 2025 |
| CVE-2025-38395 | high | 8.4 | 0% | 2025 |
| CVE-2025-38375 | high | 8.4 | 0% | 2025 |
| CVE-2025-23159 | high | 8.4 | 0% | 2025 |
| CVE-2025-38491 | high | 8.2 | 0% | 2025 |
| CVE-2025-37749 | high | 8.2 | 0% | 2025 |
| CVE-2025-22042 | high | 8.1 | 0% | 2025 |
| CVE-2021-20190 | high | 8.1 | 7% | 2021 |
| CVE-2025-39860 | high | 8 | 0% | 2025 |
| CVE-2026-4775 | high | 7.8 | 1% | 2026 |
| CVE-2025-39881 | high | 7.8 | 0% | 2025 |
| CVE-2025-39873 | high | 7.8 | 0% | 2025 |
| CVE-2025-39866 | high | 7.8 | 0% | 2025 |
| CVE-2025-39825 | high | 7.8 | 0% | 2025 |
| CVE-2025-39800 | high | 7.8 | 0% | 2025 |
| CVE-2025-39787 | high | 7.8 | 0% | 2025 |
| CVE-2025-39714 | high | 7.8 | 0% | 2025 |
| CVE-2025-39710 | high | 7.8 | 0% | 2025 |
| CVE-2025-39697 | high | 7.8 | 0% | 2025 |
| CVE-2025-39691 | high | 7.8 | 0% | 2025 |
| CVE-2025-39689 | high | 7.8 | 0% | 2025 |
226 older / lower-severity CVEs not shown — see Debian's full record.
Is my Debian 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 Debian version → · Monitor Debian for new CVEs →
Debian vulnerabilities — frequently asked
How many known vulnerabilities does Debian have?
IsItPatched tracks 306 CVEs for Debian, 3 of which are actively exploited (CISA KEV). 31 are critical-severity and 244 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Debian have any actively-exploited vulnerabilities?
Yes — 3 Debian CVEs are in CISA's Known Exploited Vulnerabilities catalog, meaning they are confirmed exploited in the wild (1 linked to ransomware). Patch these as a priority.
What is the most severe Debian vulnerability?
Among tracked issues, CVE-2021-40438 (CRITICAL, CVSS 9), which is actively exploited, ranks highest — a Server-side request forgery (SSRF) weakness.
Is Debian safe to use?
It depends on the version. The latest supported Debian release (13.6) 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: Debian security status · Debian end-of-life · actively-exploited CVEs. Always verify against Debian's advisories — see our disclaimer.