# CVE-2026-53495: containerd CRI ExecSync Goroutine Leak Leading to Node-Level Denial of Service

CVE-2026-53495 is fixed in 8 products on 1 platform, first by OPENSUSE-SU-2026:21835-1, released September 14, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-53495
- Priority: Routine
- CVSS: n/a (Moderate)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 14, 2026
- Weakness: Uncontrolled Resource Consumption
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53495

## Description

containerd is an open-source container runtime. Prior to 1.7.35, 2.0.12, 2.2.8, and 2.3.5, containerd on Linux with the CRI plugin enabled can indefinitely block the drainExecSyncIO goroutine in internal/cri/server/container_execsync.go when CRI ExecSync is used by exec probes or lifecycle hooks that launch long-lived background child processes retaining standard input and output pipes. The input and output drain phase has no default timeout and did not stop when the request context was canceled, so repeated ExecSync invocations can accumulate blocked goroutines and host memory. The resulting resource exhaustion can cause the OOM killer to terminate containerd, leaving the container runtime unavailable until restart. Deployments not using containerd's CRI implementation and containers not running on Linux are not affected. This issue is fixed in versions 1.7.35, 2.0.12, 2.2.8, and 2.3.5.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | containerd Debian 14 | 2.1.9+ds1-4 | [DEBIAN-CVE-2026-53495](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53495.md) | Oct 10, 2026 |
| Linux | containerd amzn 2023 | 2.3.5-1.amzn2023.0.1 | [ALAS2023-2026-3168](https://patchblox.com/security/data/fix/linux/alas2023-2026-3168.md) | Nov 7, 2026 |
| Linux | containerd-debuginfo amzn 2023 | 2.3.5-1.amzn2023.0.1 | [ALAS2023-2026-3168](https://patchblox.com/security/data/fix/linux/alas2023-2026-3168.md) | Nov 7, 2026 |
| Linux | containerd-debugsource amzn 2023 | 2.3.5-1.amzn2023.0.1 | [ALAS2023-2026-3168](https://patchblox.com/security/data/fix/linux/alas2023-2026-3168.md) | Nov 7, 2026 |
| Linux | containerd-stress amzn 2023 | 2.3.5-1.amzn2023.0.1 | [ALAS2023-2026-3168](https://patchblox.com/security/data/fix/linux/alas2023-2026-3168.md) | Nov 7, 2026 |
| Linux | containerd-stress-debuginfo amzn 2023 | 2.3.5-1.amzn2023.0.1 | [ALAS2023-2026-3168](https://patchblox.com/security/data/fix/linux/alas2023-2026-3168.md) | Nov 7, 2026 |
| Linux | govulncheck-vulndb opensuse-leap 16.0 | 0.0.20260916T180043-160000.1.1 | [OPENSUSE-SU-2026:21897-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21897-1.md) | Sep 21, 2026 |
| Linux | govulncheck-vulndb sles 16.0 | 0.0.20260916T180043-160000.1.1 | [SUSE-SU-2026:23863-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23863-1.md) | Sep 21, 2026 |
| Linux | hauler opensuse-leap 16.0 | 2.1.1-bp160.1.1 | [OPENSUSE-SU-2026:22116-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22116-1.md) | Nov 7, 2026 |
| Linux | trivy opensuse-leap 16.0 | 0.74.0-160000.3.1 | [OPENSUSE-SU-2026:21835-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21835-1.md) | Sep 14, 2026 |

---

Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.