# CVE-2026-109869: node-undici: undici is an HTTP client library for Node.js

CVE-2026-109869 is fixed in 21 products on 1 platform, first by DEBIAN-CVE-2026-109869, released November 1, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-109869
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0034
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 15, 2026

## Description

undici is an HTTP client library for Node.js. In versions 6.23.0 through 6.29.0, 7.18.0 through 7.30.0, and 8.0.0 through 8.12.1, its fetch() implementation crashes the Node.js process when a malicious server returns a response with more than five content codings and closes the connection before sending the body. undici rejects such responses because of a content-encoding limit, but it created the internal response stream before that check and returned without attaching an error listener or aborting the request, so the early close surfaces a content-length mismatch on the orphaned stream, which Node.js treats as an unhandled error and terminates the process. A remote, unauthenticated server can trigger this with a single response, even when the application correctly catches the fetch() rejection, resulting in a denial of service. The issue is fixed in undici 6.29.1, 7.30.1, and 8.12.2, and users should upgrade to one of those versions or later. There is no workaround.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | node-undici Debian 14 | 8.12.2+dfsg+~cs3.2.3-1 | [DEBIAN-CVE-2026-109869](https://patchblox.com/security/data/fix/linux/debian-cve-2026-109869.md) | Nov 1, 2026 |
| Linux | nodejs22 amzn 2023 | 1:22.23.4-1.amzn2023.0.1 | [ALAS2023-2026-3328](https://patchblox.com/security/data/fix/linux/alas2023-2026-3328.md) | Nov 7, 2026 |
| Linux | nodejs22-debuginfo amzn 2023 | 1:22.23.4-1.amzn2023.0.1 | [ALAS2023-2026-3328](https://patchblox.com/security/data/fix/linux/alas2023-2026-3328.md) | Nov 7, 2026 |
| Linux | nodejs22-debugsource amzn 2023 | 1:22.23.4-1.amzn2023.0.1 | [ALAS2023-2026-3328](https://patchblox.com/security/data/fix/linux/alas2023-2026-3328.md) | Nov 7, 2026 |
| Linux | nodejs22-devel amzn 2023 | 1:22.23.4-1.amzn2023.0.1 | [ALAS2023-2026-3328](https://patchblox.com/security/data/fix/linux/alas2023-2026-3328.md) | Nov 7, 2026 |
| Linux | nodejs22-docs amzn 2023 | 1:22.23.4-1.amzn2023.0.1 | [ALAS2023-2026-3328](https://patchblox.com/security/data/fix/linux/alas2023-2026-3328.md) | Nov 7, 2026 |
| Linux | nodejs22-full-i18n amzn 2023 | 1:22.23.4-1.amzn2023.0.1 | [ALAS2023-2026-3328](https://patchblox.com/security/data/fix/linux/alas2023-2026-3328.md) | Nov 7, 2026 |
| Linux | nodejs22-libs amzn 2023 | 1:22.23.4-1.amzn2023.0.1 | [ALAS2023-2026-3328](https://patchblox.com/security/data/fix/linux/alas2023-2026-3328.md) | Nov 7, 2026 |
| Linux | nodejs22-libs-debuginfo amzn 2023 | 1:22.23.4-1.amzn2023.0.1 | [ALAS2023-2026-3328](https://patchblox.com/security/data/fix/linux/alas2023-2026-3328.md) | Nov 7, 2026 |
| Linux | nodejs22-npm amzn 2023 | 1:10.9.9-1.22.23.4.1.amzn2023.0.1 | [ALAS2023-2026-3328](https://patchblox.com/security/data/fix/linux/alas2023-2026-3328.md) | Nov 7, 2026 |
| Linux | nodejs24 amzn 2023 | 1:24.22.1-1.amzn2023.0.1 | [ALAS2023-2026-3330](https://patchblox.com/security/data/fix/linux/alas2023-2026-3330.md) | Nov 7, 2026 |
| Linux | nodejs24-debuginfo amzn 2023 | 1:24.22.1-1.amzn2023.0.1 | [ALAS2023-2026-3330](https://patchblox.com/security/data/fix/linux/alas2023-2026-3330.md) | Nov 7, 2026 |
| Linux | nodejs24-debugsource amzn 2023 | 1:24.22.1-1.amzn2023.0.1 | [ALAS2023-2026-3330](https://patchblox.com/security/data/fix/linux/alas2023-2026-3330.md) | Nov 7, 2026 |
| Linux | nodejs24-devel amzn 2023 | 1:24.22.1-1.amzn2023.0.1 | [ALAS2023-2026-3330](https://patchblox.com/security/data/fix/linux/alas2023-2026-3330.md) | Nov 7, 2026 |
| Linux | nodejs24-docs amzn 2023 | 1:24.22.1-1.amzn2023.0.1 | [ALAS2023-2026-3330](https://patchblox.com/security/data/fix/linux/alas2023-2026-3330.md) | Nov 7, 2026 |
| Linux | nodejs24-full-i18n amzn 2023 | 1:24.22.1-1.amzn2023.0.1 | [ALAS2023-2026-3330](https://patchblox.com/security/data/fix/linux/alas2023-2026-3330.md) | Nov 7, 2026 |
| Linux | nodejs24-libs amzn 2023 | 1:24.22.1-1.amzn2023.0.1 | [ALAS2023-2026-3330](https://patchblox.com/security/data/fix/linux/alas2023-2026-3330.md) | Nov 7, 2026 |
| Linux | nodejs24-libs-debuginfo amzn 2023 | 1:24.22.1-1.amzn2023.0.1 | [ALAS2023-2026-3330](https://patchblox.com/security/data/fix/linux/alas2023-2026-3330.md) | Nov 7, 2026 |
| Linux | nodejs24-npm amzn 2023 | 1:11.19.1-1.24.22.1.1.amzn2023.0.1 | [ALAS2023-2026-3330](https://patchblox.com/security/data/fix/linux/alas2023-2026-3330.md) | Nov 7, 2026 |
| Linux | v8-12.4-devel amzn 2023 | 3:12.4.254.21-1.22.23.4.1.amzn2023.0.1 | [ALAS2023-2026-3328](https://patchblox.com/security/data/fix/linux/alas2023-2026-3328.md) | Nov 7, 2026 |
| Linux | v8-13.6-devel amzn 2023 | 3:13.6.233.17-1.24.22.1.1.amzn2023.0.1 | [ALAS2023-2026-3330](https://patchblox.com/security/data/fix/linux/alas2023-2026-3330.md) | Nov 7, 2026 |

---

Data as of 2026-11-09T01:18:40Z 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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