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.

Routine
CVSS
5.3
medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0020
9th percentile

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

ProductFixed inFixReleased
Linux
node-undici · Debian 14 8.10.2+dfsg+~cs3.2.2-1 DEBIAN-CVE-2026-84947 Sep 10, 2026
nodejs24 · amzn 2023 1:24.21.0-1.amzn2023.0.1 ALAS2023-2026-3107 Sep 28, 2026
nodejs24-debuginfo · amzn 2023 1:24.21.0-1.amzn2023.0.1 ALAS2023-2026-3107 Sep 28, 2026
nodejs24-debugsource · amzn 2023 1:24.21.0-1.amzn2023.0.1 ALAS2023-2026-3107 Sep 28, 2026
nodejs24-devel · amzn 2023 1:24.21.0-1.amzn2023.0.1 ALAS2023-2026-3107 Sep 28, 2026
nodejs24-docs · amzn 2023 1:24.21.0-1.amzn2023.0.1 ALAS2023-2026-3107 Sep 28, 2026
nodejs24-full-i18n · amzn 2023 1:24.21.0-1.amzn2023.0.1 ALAS2023-2026-3107 Sep 28, 2026
nodejs24-libs · amzn 2023 1:24.21.0-1.amzn2023.0.1 ALAS2023-2026-3107 Sep 28, 2026
nodejs24-libs-debuginfo · amzn 2023 1:24.21.0-1.amzn2023.0.1 ALAS2023-2026-3107 Sep 28, 2026
nodejs24-npm · amzn 2023 1:11.19.0-1.24.21.0.1.amzn2023.0.1 ALAS2023-2026-3107 Sep 28, 2026
pi-coding-agent · opensuse-leap 16.0 1.0.4-bp160.1.1 OPENSUSE-SU-2026:22111-1 Nov 7, 2026
v8-13.6-devel · amzn 2023 3:13.6.233.17-1.24.21.0.1.amzn2023.0.1 ALAS2023-2026-3107 Sep 28, 2026

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