# ALAS2023-2026-3274: nerdctl security update

ALAS2023-2026-3274, released November 7, 2026, fixes 4 CVEs in nerdctl (version 2.3.5-1.amzn2023.0.2). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/alas2023-2026-3274
- Platform: Linux
- Released: Nov 7, 2026
- Priority: High (Closes CVE-2026-78659, high severity)
- CVEs: 4, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://alas.aws.amazon.com/AL2023/ALAS-2026-3274.html

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [nerdctl](https://patchblox.com/security/data/product/linux/nerdctl.md) | amzn 2023 | 2.3.5-1.amzn2023.0.2 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-78659](https://patchblox.com/security/data/cve/CVE-2026-78659.md) | High | HTTP/2 server memory exhaustion due to Trailer headers in net/http | 7.5 | 0.0087 |  |
| [CVE-2026-78663](https://patchblox.com/security/data/cve/CVE-2026-78663.md) | High | Double flow control refund on HTTP/2 server streams in net/http | 9.1 | 0.0086 |  |
| [CVE-2026-56855](https://patchblox.com/security/data/cve/CVE-2026-56855.md) | High | Prevent DoS on deadlocked established channel in golang.org/x/crypto/ssh | 7.5 | 0.0050 |  |
| [CVE-2026-78662](https://patchblox.com/security/data/cve/CVE-2026-78662.md) | High | Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh | 7.5 | 0.0043 |  |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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