# CVE-2026-109924: node-undici: undici is an HTTP client library for Node.js

CVE-2026-109924 is fixed in 21 products on 1 platform, first by DEBIAN-CVE-2026-109924, released November 1, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-109924
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0032
- 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 6.5.0 through 6.29.0, 7.0.0 through 7.30.0, and 8.0.0 through 8.12.1, its EventSource client can be driven to exhaust process memory by a malicious or compromised Server-Sent Events peer. By sending millions of tiny completed data fields with no blank event separator, or a single unfinished line split across many chunks, the parser retains a growing amount of per-field and per-chunk state that the byte-based maxEventSize and maxResponseSize limits do not bound, and because maxResponseSize is enforced on the compressed body before decompression, a small compressed response can expand into enough retained memory to terminate the process. An application only needs to maintain an EventSource connection to an untrusted peer, which controls only the response, and availability is the only impact. The issue is fixed in undici 6.29.1, 7.30.1, and 8.12.2, which bound the retained parser state independently of the byte limits, 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-2026-109924](https://patchblox.com/security/data/fix/linux/debian-cve-2026-109924.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 2026-11-09T19:38:12Z 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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