# CVE-2026-16728: node-undici: undici's retry interceptor can deliver a response whose body length does not match the Content-Length header exposed... CVE-2026-16728 is fixed in 22 products on 1 platform, first by DEBIAN-CVE-2026-16728, released August 5, 2026. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2026-16728 - Priority: Routine - CVSS: 6.5 (medium) - EPSS: 0.0029 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jul 29, 2026 ## Description undici's retry interceptor can deliver a response whose body length does not match the Content-Length header exposed to the application after a retry or resume of a partial response. In undici before 6.28.0, from 7.0.0 up to before 7.29.0, and from 8.0.0 up to before 8.9.0, a malicious or faulty upstream can return a partial response with a mismatched framing header, close the socket early, and have the retry interceptor assemble a body of a different length while the original Content-Length stays attached. Applications that use the retry interceptor and forward upstream headers and bodies downstream, such as proxies or gateways, may then emit an invalid HTTP response with a stale Content-Length, leading to downstream response desynchronization, connection hangs, or response corruption. Exploitation requires the retry interceptor enabled, an upstream returning a mismatched partial response, and a downstream forwarder that does not remove or recalculate Content-Length. The issue is fixed in undici 6.28.0, 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-2026-16728](https://patchblox.com/security/data/fix/linux/debian-cve-2026-16728.md) | Aug 5, 2026 | | Linux | nodejs20 sles 15.6 | 20.20.2-150600.3.21.1 | [SUSE-SU-2026:3929-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3929-1.md) | Sep 3, 2026 | | Linux | nodejs22 amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs22-debuginfo amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs22-debugsource amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs22-devel amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs22-docs amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs22-full-i18n amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs22-libs amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs22-libs-debuginfo amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs22-npm amzn 2023 | 1:10.9.8-1.22.23.2.1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 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 | v8-12.4-devel amzn 2023 | 3:12.4.254.21-1.22.23.2.1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.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 | --- Data as of 2026-11-08T13:06:02Z UTC. 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