# ALAS2023-2026-1788: nerdctl security update

ALAS2023-2026-1788, released June 8, 2026, fixes 19 CVEs in nerdctl (version 2.2.2-1.amzn2023.0.3). None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/linux/alas2023-2026-1788
- Platform: Linux
- Released: Jun 8, 2026
- Priority: Urgent (Closes CVE-2026-39821, rated Critical)
- CVEs: 19, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://alas.aws.amazon.com/AL2023/ALAS-2026-1788.html

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [nerdctl](https://patchblox.com/security/data/product/linux/nerdctl.md) | amzn 2023 | 2.2.2-1.amzn2023.0.3 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-39821](https://patchblox.com/security/data/cve/CVE-2026-39821.md) | Urgent | Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna | 10.0 | 0.0183 |  |
| [CVE-2026-46595](https://patchblox.com/security/data/cve/CVE-2026-46595.md) | Urgent | Invoking  VerifiedPublicKeyCallback permissions skip enforcement in golang.org/x/crypto/ssh | 10.0 | 0.0056 |  |
| [CVE-2026-42508](https://patchblox.com/security/data/cve/CVE-2026-42508.md) | High | Invoking  auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts | 9.1 | 0.0691 |  |
| [CVE-2026-39830](https://patchblox.com/security/data/cve/CVE-2026-39830.md) | High | Invoking  client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh | 9.1 | 0.0068 |  |
| [CVE-2026-39832](https://patchblox.com/security/data/cve/CVE-2026-39832.md) | High | Invoking  agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent | 9.1 | 0.0068 |  |
| [CVE-2026-39834](https://patchblox.com/security/data/cve/CVE-2026-39834.md) | High | Invoking  infinite loop on large channel writes in golang.org/x/crypto/ssh | 9.1 | 0.0060 |  |
| [CVE-2026-39835](https://patchblox.com/security/data/cve/CVE-2026-39835.md) | High | Invoking  server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh | 8.7 | 0.0050 |  |
| [CVE-2026-39831](https://patchblox.com/security/data/cve/CVE-2026-39831.md) | High | Invoking  bypass of FIDO/U2F security keys physical interaction in golang.org/x/crypto/ssh | 9.1 | 0.0048 |  |
| [CVE-2026-46597](https://patchblox.com/security/data/cve/CVE-2026-46597.md) | High | Invoking  byte arithmetic causes underflow and panic in golang.org/x/crypto/ssh | 7.5 | 0.0047 |  |
| [CVE-2026-39833](https://patchblox.com/security/data/cve/CVE-2026-39833.md) | High | Invoking  key constraints not enforced in golang.org/x/crypto/ssh/agent | 9.1 | 0.0047 |  |
| [CVE-2026-39829](https://patchblox.com/security/data/cve/CVE-2026-39829.md) | High | Invoking  pathological RSA/DSA parameters may cause DoS in golang.org/x/crypto/ssh | 8.7 | 0.0047 |  |
| [CVE-2026-39828](https://patchblox.com/security/data/cve/CVE-2026-39828.md) | High | Invoking  bypass of certificate restrictions in golang.org/x/crypto/ssh | 8.8 | 0.0037 |  |
| [CVE-2026-25681](https://patchblox.com/security/data/cve/CVE-2026-25681.md) | High | Invoking  incorrect handling of character references in DOCTYPE nodes in golang.org/x/net/html | 8.7 | 0.0022 |  |
| [CVE-2026-27136](https://patchblox.com/security/data/cve/CVE-2026-27136.md) | High | Invoking  duplicate attributes can cause XSS in golang.org/x/net/html | 8.7 | 0.0022 |  |
| [CVE-2026-42502](https://patchblox.com/security/data/cve/CVE-2026-42502.md) | High | Invoking  incorrect handling of HTML elements in foreign content in golang.org/x/net/html | 8.2 | 0.0022 |  |
| [CVE-2026-46598](https://patchblox.com/security/data/cve/CVE-2026-46598.md) | Routine | Invoking  pathological inputs can lead to client panic in golang.org/x/crypto/ssh/agent | 5.3 | 0.0041 |  |
| [CVE-2026-25680](https://patchblox.com/security/data/cve/CVE-2026-25680.md) | Routine | Invoking denial of service when parsing arbitrary HTML in golang.org/x/net/html | 6.5 | 0.0033 |  |
| [CVE-2026-39827](https://patchblox.com/security/data/cve/CVE-2026-39827.md) | Routine | Invoking  memory leak when rejecting channels can lead to DoS in golang.org/x/crypto/ssh | 6.5 | 0.0028 |  |
| [CVE-2026-42506](https://patchblox.com/security/data/cve/CVE-2026-42506.md) | Routine | Invoking  incorrect handling of namespaced elements in foreign content in golang.org/x/net/html | 6.1 | 0.0024 |  |

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Data as of 2026-11-10T07:50:38Z 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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