# CVE-2026-84947: node-undici: undici's dump interceptor reads and discards a response body up to a configurable maximum size

CVE-2026-84947 is fixed in 12 products on 1 platform, first by DEBIAN-CVE-2026-84947, released September 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-84947
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 4, 2026

## Description

undici's dump interceptor reads and discards a response body up to a configurable maximum size. When a response declares a Content-Length that exceeds the maximum, the interceptor aborts cleanly, but when a response has no Content-Length and is chunked, the interceptor instead signals completion early once the accumulated size reaches the maximum, without pausing or aborting the request. Because the underlying parser keeps delivering body bytes, a second completion signal fires and trips an internal assertion, which aborts the request and tears down the connection. The application is left observing a misleading successful status with an empty or truncated body while the connection has actually been disconnected. This affects undici versions from 7.1.0 up to 7.29.1 and from 8.0.0 up to 8.10.2. Users should upgrade to undici 7.29.1 or 8.10.2.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | node-undici Debian 14 | 8.10.2+dfsg+~cs3.2.2-1 | [DEBIAN-CVE-2026-84947](https://patchblox.com/security/data/fix/linux/debian-cve-2026-84947.md) | Sep 10, 2026 |
| Linux | nodejs24 amzn 2023 | 1:24.21.0-1.amzn2023.0.1 | [ALAS2023-2026-3107](https://patchblox.com/security/data/fix/linux/alas2023-2026-3107.md) | Sep 28, 2026 |
| Linux | nodejs24-debuginfo amzn 2023 | 1:24.21.0-1.amzn2023.0.1 | [ALAS2023-2026-3107](https://patchblox.com/security/data/fix/linux/alas2023-2026-3107.md) | Sep 28, 2026 |
| Linux | nodejs24-debugsource amzn 2023 | 1:24.21.0-1.amzn2023.0.1 | [ALAS2023-2026-3107](https://patchblox.com/security/data/fix/linux/alas2023-2026-3107.md) | Sep 28, 2026 |
| Linux | nodejs24-devel amzn 2023 | 1:24.21.0-1.amzn2023.0.1 | [ALAS2023-2026-3107](https://patchblox.com/security/data/fix/linux/alas2023-2026-3107.md) | Sep 28, 2026 |
| Linux | nodejs24-docs amzn 2023 | 1:24.21.0-1.amzn2023.0.1 | [ALAS2023-2026-3107](https://patchblox.com/security/data/fix/linux/alas2023-2026-3107.md) | Sep 28, 2026 |
| Linux | nodejs24-full-i18n amzn 2023 | 1:24.21.0-1.amzn2023.0.1 | [ALAS2023-2026-3107](https://patchblox.com/security/data/fix/linux/alas2023-2026-3107.md) | Sep 28, 2026 |
| Linux | nodejs24-libs amzn 2023 | 1:24.21.0-1.amzn2023.0.1 | [ALAS2023-2026-3107](https://patchblox.com/security/data/fix/linux/alas2023-2026-3107.md) | Sep 28, 2026 |
| Linux | nodejs24-libs-debuginfo amzn 2023 | 1:24.21.0-1.amzn2023.0.1 | [ALAS2023-2026-3107](https://patchblox.com/security/data/fix/linux/alas2023-2026-3107.md) | Sep 28, 2026 |
| Linux | nodejs24-npm amzn 2023 | 1:11.19.0-1.24.21.0.1.amzn2023.0.1 | [ALAS2023-2026-3107](https://patchblox.com/security/data/fix/linux/alas2023-2026-3107.md) | Sep 28, 2026 |
| Linux | pi-coding-agent opensuse-leap 16.0 | 1.0.4-bp160.1.1 | [OPENSUSE-SU-2026:22111-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22111-1.md) | Nov 7, 2026 |
| Linux | v8-13.6-devel amzn 2023 | 3:13.6.233.17-1.24.21.0.1.amzn2023.0.1 | [ALAS2023-2026-3107](https://patchblox.com/security/data/fix/linux/alas2023-2026-3107.md) | Sep 28, 2026 |

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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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