# CVE-2026-13697: node-undici: undici's cache interceptor mishandles malformed Cache-Control private directives

CVE-2026-13697 is fixed in 11 products on 1 platform, first by DEBIAN-CVE-2026-13697, released August 5, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-13697
- Priority: Urgent
- CVSS: 9.1 (critical)
- EPSS: 0.0057
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 29, 2026

## Description

undici's cache interceptor mishandles malformed Cache-Control private directives. In undici 7.0.0 up to before 7.29.0 and 8.0.0 up to before 8.9.0, a response carrying a degenerate qualified private directive, such as private set to an empty value, can be stored in the default shared cache and later served to a different caller with the same cache key, disclosing private response bodies and headers including Set-Cookie. Separately, a Cache-Control header that combines an unqualified private directive with a qualified one triggers an uncaught TypeError in the cache-control parser, which rejects the request and, depending on the consumer's error handling, can terminate the process. Both issues affect applications using the cache interceptor in shared mode, including the default configuration. The issues are fixed in undici 7.29.0 and 8.9.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | node-undici Debian 14 | 8.9.0+dfsg+~cs3.2.0-1 | [DEBIAN-CVE-2026-13697](https://patchblox.com/security/data/fix/linux/debian-cve-2026-13697.md) | Aug 5, 2026 |
| Linux | nodejs24 amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | nodejs24-debuginfo amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | nodejs24-debugsource amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | nodejs24-devel amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | nodejs24-docs amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | nodejs24-full-i18n amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | nodejs24-libs amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | nodejs24-libs-debuginfo amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | nodejs24-npm amzn 2023 | 1:11.16.0-1.24.18.1.1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | v8-13.6-devel amzn 2023 | 3:13.6.233.17-1.24.18.1.1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |

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Data as of 2026-11-08T00:53:09Z 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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