# CVE-2026-85024: node-undici: undici bundles a WebSocket client whose permessage-deflate size-limit cleanup removes all listeners from the internal... CVE-2026-85024 is fixed in 22 products on 1 platform, first by DEBIAN-CVE-2026-85024, released September 10, 2026. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2026-85024 - Priority: Routine - CVSS: 5.9 (medium) - EPSS: 0.0041 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 4, 2026 ## Description undici bundles a WebSocket client whose permessage-deflate size-limit cleanup removes all listeners from the internal zlib inflate stream, including its error listener, while that stream can still emit. When a remote peer sends a compressed payload that crosses the built-in 128 MiB decompressed-payload limit and then contains a malformed DEFLATE byte, the inflate stream emits a data error with no listener attached, which Node.js treats as a fatal unhandled error and terminates the entire process. Exploitation is remote and unauthenticated, requires no application mistake, and is asymmetric, since roughly 130 KB on the wire expands past the limit and crashes the process, and reconnecting can repeat the crash. This affects undici versions from 6.25.0 up to 6.28.1, from 7.28.0 up to 7.29.1, and from 8.1.0 up to 8.10.2. Users should upgrade to undici 6.28.1, 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-2026-85024](https://patchblox.com/security/data/fix/linux/debian-cve-2026-85024.md) | Sep 10, 2026 | | Linux | nodejs22 amzn 2023 | 1:22.23.2-1.amzn2023.0.3 | [ALAS2023-2026-3123](https://patchblox.com/security/data/fix/linux/alas2023-2026-3123.md) | Sep 28, 2026 | | Linux | nodejs22-debuginfo amzn 2023 | 1:22.23.2-1.amzn2023.0.3 | [ALAS2023-2026-3123](https://patchblox.com/security/data/fix/linux/alas2023-2026-3123.md) | Sep 28, 2026 | | Linux | nodejs22-debugsource amzn 2023 | 1:22.23.2-1.amzn2023.0.3 | [ALAS2023-2026-3123](https://patchblox.com/security/data/fix/linux/alas2023-2026-3123.md) | Sep 28, 2026 | | Linux | nodejs22-devel amzn 2023 | 1:22.23.2-1.amzn2023.0.3 | [ALAS2023-2026-3123](https://patchblox.com/security/data/fix/linux/alas2023-2026-3123.md) | Sep 28, 2026 | | Linux | nodejs22-docs amzn 2023 | 1:22.23.2-1.amzn2023.0.3 | [ALAS2023-2026-3123](https://patchblox.com/security/data/fix/linux/alas2023-2026-3123.md) | Sep 28, 2026 | | Linux | nodejs22-full-i18n amzn 2023 | 1:22.23.2-1.amzn2023.0.3 | [ALAS2023-2026-3123](https://patchblox.com/security/data/fix/linux/alas2023-2026-3123.md) | Sep 28, 2026 | | Linux | nodejs22-libs amzn 2023 | 1:22.23.2-1.amzn2023.0.3 | [ALAS2023-2026-3123](https://patchblox.com/security/data/fix/linux/alas2023-2026-3123.md) | Sep 28, 2026 | | Linux | nodejs22-libs-debuginfo amzn 2023 | 1:22.23.2-1.amzn2023.0.3 | [ALAS2023-2026-3123](https://patchblox.com/security/data/fix/linux/alas2023-2026-3123.md) | Sep 28, 2026 | | Linux | nodejs22-npm amzn 2023 | 1:10.9.8-1.22.23.2.1.amzn2023.0.3 | [ALAS2023-2026-3123](https://patchblox.com/security/data/fix/linux/alas2023-2026-3123.md) | Sep 28, 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 | v8-12.4-devel amzn 2023 | 3:12.4.254.21-1.22.23.2.1.amzn2023.0.3 | [ALAS2023-2026-3123](https://patchblox.com/security/data/fix/linux/alas2023-2026-3123.md) | Sep 28, 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 | --- Data as of 2026-11-09T07:25:28Z UTC. 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