# CVE-2026-84961: node-undici: undici's BalancedPool constructor passes its entire options object through an internal deep-clone that serializes and...

CVE-2026-84961 is fixed in 21 products on 1 platform, first by DEBIAN-CVE-2026-84961, released September 10, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-84961
- Priority: Urgent
- CVSS: 9.1 (critical)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 4, 2026

## Description

undici's BalancedPool constructor passes its entire options object through an internal deep-clone that serializes and reparses the value as JSON. Because JSON cannot represent functions, any function-valued TLS option, such as a caller-supplied checkServerIdentity callback or a custom connector inside the connect option, is silently discarded before it reaches the TLS layer. As a result a peer whose certificate the application's custom checkServerIdentity was written to reject, but which still passes Node's default hostname and chain checks, is accepted when reached through BalancedPool. The Client, Pool, and Agent dispatchers are not affected because they extract the connect and tls options before cloning. This affects undici versions from 7.24.1 up to 7.29.1 and from 8.0.0 up to 8.10.2, and only when the application supplies a function-valued connect or tls option to BalancedPool. 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-2026-84961](https://patchblox.com/security/data/fix/linux/debian-cve-2026-84961.md) | Sep 10, 2026 |
| Linux | nodejs RHEL 8 | 1:24.21.0-1.module+el8.10.0+24927+ed3d907a | [RHSA-2026:74085](https://patchblox.com/security/data/fix/linux/rhsa-2026-74085.md) | Oct 1, 2026 |
| Linux | nodejs RHEL 9 | 1:24.21.0-1.module+el9.8.0+24924+cd677006 | [RHSA-2026:73838](https://patchblox.com/security/data/fix/linux/rhsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs almalinux 8 | 1:24.21.0-1.module_el8.10.0+4292+21afb960 | [ALSA-2026:74085](https://patchblox.com/security/data/fix/linux/alsa-2026-74085.md) | Sep 30, 2026 |
| Linux | nodejs almalinux 9 | 1:24.21.0-1.module_el9.8.0+321+1555b6a2 | [ALSA-2026:73838](https://patchblox.com/security/data/fix/linux/alsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs ol 8 | 1:24.21.0-1.module+el8.10.0+91054+4b1a799c | [ELSA-2026-74085](https://patchblox.com/security/data/fix/linux/elsa-2026-74085.md) | Oct 2, 2026 |
| Linux | nodejs ol 9 | 1:24.21.0-1.module+el9.8.0+91053+65d3e6aa | [ELSA-2026-73838](https://patchblox.com/security/data/fix/linux/elsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-devel RHEL 8 | 1:24.21.0-1.module+el8.10.0+24927+ed3d907a | [RHSA-2026:74085](https://patchblox.com/security/data/fix/linux/rhsa-2026-74085.md) | Oct 1, 2026 |
| Linux | nodejs-devel RHEL 9 | 1:24.21.0-1.module+el9.8.0+24924+cd677006 | [RHSA-2026:73838](https://patchblox.com/security/data/fix/linux/rhsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-devel almalinux 8 | 1:24.21.0-1.module_el8.10.0+4292+21afb960 | [ALSA-2026:74085](https://patchblox.com/security/data/fix/linux/alsa-2026-74085.md) | Sep 30, 2026 |
| Linux | nodejs-devel almalinux 9 | 1:24.21.0-1.module_el9.8.0+321+1555b6a2 | [ALSA-2026:73838](https://patchblox.com/security/data/fix/linux/alsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-devel ol 8 | 1:24.21.0-1.module+el8.10.0+91054+4b1a799c | [ELSA-2026-74085](https://patchblox.com/security/data/fix/linux/elsa-2026-74085.md) | Oct 2, 2026 |
| Linux | nodejs-devel ol 9 | 1:24.21.0-1.module+el9.8.0+91053+65d3e6aa | [ELSA-2026-73838](https://patchblox.com/security/data/fix/linux/elsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-docs RHEL 8 | 1:24.21.0-1.module+el8.10.0+24927+ed3d907a | [RHSA-2026:74085](https://patchblox.com/security/data/fix/linux/rhsa-2026-74085.md) | Oct 1, 2026 |
| Linux | nodejs-docs RHEL 9 | 1:24.21.0-1.module+el9.8.0+24924+cd677006 | [RHSA-2026:73838](https://patchblox.com/security/data/fix/linux/rhsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-docs almalinux 8 | 1:24.21.0-1.module_el8.10.0+4292+21afb960 | [ALSA-2026:74085](https://patchblox.com/security/data/fix/linux/alsa-2026-74085.md) | Sep 30, 2026 |
| Linux | nodejs-docs almalinux 9 | 1:24.21.0-1.module_el9.8.0+321+1555b6a2 | [ALSA-2026:73838](https://patchblox.com/security/data/fix/linux/alsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-docs ol 8 | 1:24.21.0-1.module+el8.10.0+91054+4b1a799c | [ELSA-2026-74085](https://patchblox.com/security/data/fix/linux/elsa-2026-74085.md) | Oct 2, 2026 |
| Linux | nodejs-docs ol 9 | 1:24.21.0-1.module+el9.8.0+91053+65d3e6aa | [ELSA-2026-73838](https://patchblox.com/security/data/fix/linux/elsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-full-i18n RHEL 8 | 1:24.21.0-1.module+el8.10.0+24927+ed3d907a | [RHSA-2026:74085](https://patchblox.com/security/data/fix/linux/rhsa-2026-74085.md) | Oct 1, 2026 |
| Linux | nodejs-full-i18n RHEL 9 | 1:24.21.0-1.module+el9.8.0+24924+cd677006 | [RHSA-2026:73838](https://patchblox.com/security/data/fix/linux/rhsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-full-i18n almalinux 8 | 1:24.21.0-1.module_el8.10.0+4292+21afb960 | [ALSA-2026:74085](https://patchblox.com/security/data/fix/linux/alsa-2026-74085.md) | Sep 30, 2026 |
| Linux | nodejs-full-i18n almalinux 9 | 1:24.21.0-1.module_el9.8.0+321+1555b6a2 | [ALSA-2026:73838](https://patchblox.com/security/data/fix/linux/alsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-full-i18n ol 8 | 1:24.21.0-1.module+el8.10.0+91054+4b1a799c | [ELSA-2026-74085](https://patchblox.com/security/data/fix/linux/elsa-2026-74085.md) | Oct 2, 2026 |
| Linux | nodejs-full-i18n ol 9 | 1:24.21.0-1.module+el9.8.0+91053+65d3e6aa | [ELSA-2026-73838](https://patchblox.com/security/data/fix/linux/elsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-libs RHEL 8 | 1:24.21.0-1.module+el8.10.0+24927+ed3d907a | [RHSA-2026:74085](https://patchblox.com/security/data/fix/linux/rhsa-2026-74085.md) | Oct 1, 2026 |
| Linux | nodejs-libs RHEL 9 | 1:24.21.0-1.module+el9.8.0+24924+cd677006 | [RHSA-2026:73838](https://patchblox.com/security/data/fix/linux/rhsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-libs almalinux 8 | 1:24.21.0-1.module_el8.10.0+4292+21afb960 | [ALSA-2026:74085](https://patchblox.com/security/data/fix/linux/alsa-2026-74085.md) | Sep 30, 2026 |
| Linux | nodejs-libs almalinux 9 | 1:24.21.0-1.module_el9.8.0+321+1555b6a2 | [ALSA-2026:73838](https://patchblox.com/security/data/fix/linux/alsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-libs ol 8 | 1:24.21.0-1.module+el8.10.0+91054+4b1a799c | [ELSA-2026-74085](https://patchblox.com/security/data/fix/linux/elsa-2026-74085.md) | Oct 2, 2026 |
| Linux | nodejs-libs ol 9 | 1:24.21.0-1.module+el9.8.0+91053+65d3e6aa | [ELSA-2026-73838](https://patchblox.com/security/data/fix/linux/elsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-nodemon RHEL 8 | 0:3.1.14-2.module+el8.10.0+24711+b610b202 | [RHSA-2026:74085](https://patchblox.com/security/data/fix/linux/rhsa-2026-74085.md) | Oct 1, 2026 |
| Linux | nodejs-nodemon RHEL 9 | 0:3.1.14-3.module+el9.8.0+24708+e71d2e1d | [RHSA-2026:73838](https://patchblox.com/security/data/fix/linux/rhsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-nodemon almalinux 8 | 3.1.14-2.module_el8.10.0+4250+09238ed4 | [ALSA-2026:74085](https://patchblox.com/security/data/fix/linux/alsa-2026-74085.md) | Sep 30, 2026 |
| Linux | nodejs-nodemon almalinux 9 | 3.1.14-3.module_el9.8.0+292+f4eaf8b2 | [ALSA-2026:73838](https://patchblox.com/security/data/fix/linux/alsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-nodemon ol 8 | 0:3.1.14-2.module+el8.10.0+91054+4b1a799c | [ELSA-2026-74085](https://patchblox.com/security/data/fix/linux/elsa-2026-74085.md) | Oct 2, 2026 |
| Linux | nodejs-nodemon ol 9 | 0:3.1.14-3.module+el9.8.0+91009+5d530ccd | [ELSA-2026-73838](https://patchblox.com/security/data/fix/linux/elsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-nodemon rocky 8 | 0:3.1.14-2.module+el8.10.0+40277+b1b3f89e | [RLSA-2026:74085](https://patchblox.com/security/data/fix/linux/rlsa-2026-74085.md) | Oct 1, 2026 |
| Linux | nodejs-nodemon rocky 9 | 0:3.1.14-3.module+el9.8.0+40281+14cc6568 | [RLSA-2026:73838](https://patchblox.com/security/data/fix/linux/rlsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-packaging RHEL 8 | 0:2021.06-6.module+el8.10.0+24711+b610b202 | [RHSA-2026:74085](https://patchblox.com/security/data/fix/linux/rhsa-2026-74085.md) | Oct 1, 2026 |
| Linux | nodejs-packaging RHEL 9 | 0:2021.06-6.module+el9.8.0+24708+e71d2e1d | [RHSA-2026:73838](https://patchblox.com/security/data/fix/linux/rhsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-packaging almalinux 8 | 2021.06-6.module_el8.10.0+4086+70facd4a | [ALSA-2026:74085](https://patchblox.com/security/data/fix/linux/alsa-2026-74085.md) | Sep 30, 2026 |
| Linux | nodejs-packaging almalinux 9 | 2021.06-6.module_el9.7.0+209+ecf6523e | [ALSA-2026:73838](https://patchblox.com/security/data/fix/linux/alsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-packaging ol 8 | 0:2021.06-6.module+el8.10.0+91054+4b1a799c | [ELSA-2026-74085](https://patchblox.com/security/data/fix/linux/elsa-2026-74085.md) | Oct 2, 2026 |
| Linux | nodejs-packaging ol 9 | 0:2021.06-6.module+el9.8.0+91009+5d530ccd | [ELSA-2026-73838](https://patchblox.com/security/data/fix/linux/elsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-packaging rocky 8 | 0:2021.06-6.module+el8.10.0+40171+8fa9c325 | [RLSA-2026:74085](https://patchblox.com/security/data/fix/linux/rlsa-2026-74085.md) | Oct 1, 2026 |
| Linux | nodejs-packaging rocky 9 | 0:2021.06-6.module+el9.7.0+40153+4d595597 | [RLSA-2026:73838](https://patchblox.com/security/data/fix/linux/rlsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-packaging-bundler RHEL 8 | 0:2021.06-6.module+el8.10.0+24711+b610b202 | [RHSA-2026:74085](https://patchblox.com/security/data/fix/linux/rhsa-2026-74085.md) | Oct 1, 2026 |
| Linux | nodejs-packaging-bundler RHEL 9 | 0:2021.06-6.module+el9.8.0+24708+e71d2e1d | [RHSA-2026:73838](https://patchblox.com/security/data/fix/linux/rhsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-packaging-bundler almalinux 8 | 2021.06-6.module_el8.10.0+4086+70facd4a | [ALSA-2026:74085](https://patchblox.com/security/data/fix/linux/alsa-2026-74085.md) | Sep 30, 2026 |
| Linux | nodejs-packaging-bundler almalinux 9 | 2021.06-6.module_el9.7.0+209+ecf6523e | [ALSA-2026:73838](https://patchblox.com/security/data/fix/linux/alsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs-packaging-bundler ol 8 | 0:2021.06-6.module+el8.10.0+91054+4b1a799c | [ELSA-2026-74085](https://patchblox.com/security/data/fix/linux/elsa-2026-74085.md) | Oct 2, 2026 |
| Linux | nodejs-packaging-bundler ol 9 | 0:2021.06-6.module+el9.8.0+91009+5d530ccd | [ELSA-2026-73838](https://patchblox.com/security/data/fix/linux/elsa-2026-73838.md) | Sep 30, 2026 |
| Linux | nodejs24 RHEL 10 | 24.21.0-1.el10_2 | [RHSA-2026:73428](https://patchblox.com/security/data/fix/linux/rhsa-2026-73428.md) | Sep 30, 2026 |
| Linux | nodejs24 almalinux 10 | 1:24.21.0-1.el10_2 | [ALSA-2026:73428](https://patchblox.com/security/data/fix/linux/alsa-2026-73428.md) | Sep 29, 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 ol 10 | 1:24.21.0-1.0.1.el10_2 | [ELSA-2026-73428](https://patchblox.com/security/data/fix/linux/elsa-2026-73428.md) | Sep 30, 2026 |
| Linux | nodejs24 rocky 10 | 1:24.21.0-1.el10_2 | [RLSA-2026:73428](https://patchblox.com/security/data/fix/linux/rlsa-2026-73428.md) | Oct 1, 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 almalinux 10 | 1:24.21.0-1.el10_2 | [ALSA-2026:73428](https://patchblox.com/security/data/fix/linux/alsa-2026-73428.md) | Sep 29, 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-devel ol 10 | 1:24.21.0-1.0.1.el10_2 | [ELSA-2026-73428](https://patchblox.com/security/data/fix/linux/elsa-2026-73428.md) | Sep 30, 2026 |
| Linux | nodejs24-docs almalinux 10 | 1:24.21.0-1.el10_2 | [ALSA-2026:73428](https://patchblox.com/security/data/fix/linux/alsa-2026-73428.md) | Sep 29, 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-docs ol 10 | 1:24.21.0-1.0.1.el10_2 | [ELSA-2026-73428](https://patchblox.com/security/data/fix/linux/elsa-2026-73428.md) | Sep 30, 2026 |
| Linux | nodejs24-full-i18n almalinux 10 | 1:24.21.0-1.el10_2 | [ALSA-2026:73428](https://patchblox.com/security/data/fix/linux/alsa-2026-73428.md) | Sep 29, 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-full-i18n ol 10 | 1:24.21.0-1.0.1.el10_2 | [ELSA-2026-73428](https://patchblox.com/security/data/fix/linux/elsa-2026-73428.md) | Sep 30, 2026 |
| Linux | nodejs24-libs almalinux 10 | 1:24.21.0-1.el10_2 | [ALSA-2026:73428](https://patchblox.com/security/data/fix/linux/alsa-2026-73428.md) | Sep 29, 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 ol 10 | 1:24.21.0-1.0.1.el10_2 | [ELSA-2026-73428](https://patchblox.com/security/data/fix/linux/elsa-2026-73428.md) | Sep 30, 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 almalinux 10 | 2:11.19.0-1.24.21.0.1.el10_2 | [ALSA-2026:73428](https://patchblox.com/security/data/fix/linux/alsa-2026-73428.md) | Sep 29, 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 | nodejs24-npm ol 10 | 2:11.19.0-1.24.21.0.1.0.1.el10_2 | [ELSA-2026-73428](https://patchblox.com/security/data/fix/linux/elsa-2026-73428.md) | Sep 30, 2026 |
| Linux | npm RHEL 8 | 1:11.19.0-1.24.21.0.1.module+el8.10.0+24927+ed3d907a | [RHSA-2026:74085](https://patchblox.com/security/data/fix/linux/rhsa-2026-74085.md) | Oct 1, 2026 |
| Linux | npm RHEL 9 | 1:11.19.0-1.24.21.0.1.module+el9.8.0+24924+cd677006 | [RHSA-2026:73838](https://patchblox.com/security/data/fix/linux/rhsa-2026-73838.md) | Sep 30, 2026 |
| Linux | npm almalinux 8 | 1:11.19.0-1.24.21.0.1.module_el8.10.0+4292+21afb960 | [ALSA-2026:74085](https://patchblox.com/security/data/fix/linux/alsa-2026-74085.md) | Sep 30, 2026 |
| Linux | npm almalinux 9 | 1:11.19.0-1.24.21.0.1.module_el9.8.0+321+1555b6a2 | [ALSA-2026:73838](https://patchblox.com/security/data/fix/linux/alsa-2026-73838.md) | Sep 30, 2026 |
| Linux | npm ol 8 | 1:11.19.0-1.24.21.0.1.module+el8.10.0+91054+4b1a799c | [ELSA-2026-74085](https://patchblox.com/security/data/fix/linux/elsa-2026-74085.md) | Oct 2, 2026 |
| Linux | npm ol 9 | 1:11.19.0-1.24.21.0.1.module+el9.8.0+91053+65d3e6aa | [ELSA-2026-73838](https://patchblox.com/security/data/fix/linux/elsa-2026-73838.md) | Sep 30, 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 RHEL 8 | 3:13.6.233.17-1.24.21.0.1.module+el8.10.0+24927+ed3d907a | [RHSA-2026:74085](https://patchblox.com/security/data/fix/linux/rhsa-2026-74085.md) | Oct 1, 2026 |
| Linux | v8-13.6-devel RHEL 9 | 3:13.6.233.17-1.24.21.0.1.module+el9.8.0+24924+cd677006 | [RHSA-2026:73838](https://patchblox.com/security/data/fix/linux/rhsa-2026-73838.md) | Sep 30, 2026 |
| Linux | v8-13.6-devel almalinux 8 | 3:13.6.233.17-1.24.21.0.1.module_el8.10.0+4292+21afb960 | [ALSA-2026:74085](https://patchblox.com/security/data/fix/linux/alsa-2026-74085.md) | Sep 30, 2026 |
| Linux | v8-13.6-devel almalinux 9 | 3:13.6.233.17-1.24.21.0.1.module_el9.8.0+321+1555b6a2 | [ALSA-2026:73838](https://patchblox.com/security/data/fix/linux/alsa-2026-73838.md) | Sep 30, 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 |
| Linux | v8-13.6-devel ol 8 | 3:13.6.233.17-1.24.21.0.1.module+el8.10.0+91054+4b1a799c | [ELSA-2026-74085](https://patchblox.com/security/data/fix/linux/elsa-2026-74085.md) | Oct 2, 2026 |
| Linux | v8-13.6-devel ol 9 | 3:13.6.233.17-1.24.21.0.1.module+el9.8.0+91053+65d3e6aa | [ELSA-2026-73838](https://patchblox.com/security/data/fix/linux/elsa-2026-73838.md) | Sep 30, 2026 |

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Data as of 2026-11-10T01:44:33Z 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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