Vulnerability · Published Aug 4, 2026 · Assigned by hackerone
CVE-2026-56846
High 7.5
In plain English
A high-severity uncontrolled resource consumption in node from nodejs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.0)7.5High
Exploit odds (30 days)0.5%top 57.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
A flaw in Node.js HTTP/2 handling can cause HTTP/2 retained header blocks evade maxSessionMemory and enable remote memory exhaustion. This vulnerability affects Node.js **24.x** and **22.x**.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | nodejs | 1:22.23.2-1.el10_2 | ALSA-2026:61376 |
| AlmaLinux:8 | nodejs | 1:22.23.2-1.module_el8.10.0+4265+75d28086 | ALSA-2026:62219 |
| AlmaLinux:8 | nodejs | 1:24.19.0-1.module_el8.10.0+4268+8e07aa5a | ALSA-2026:62583 |
| AlmaLinux:9 | nodejs | 1:24.19.0-1.module_el9.8.0+301+084fac05 | ALSA-2026:61386 |
| AlmaLinux:9 | nodejs | 1:22.23.2-1.module_el9.8.0+302+959ebcd4 | ALSA-2026:61383 |
| AlmaLinux:10 | nodejs-devel | 1:22.23.2-1.el10_2 | ALSA-2026:61376 |
| AlmaLinux:8 | nodejs-devel | 1:22.23.2-1.module_el8.10.0+4265+75d28086 | ALSA-2026:62219 |
| AlmaLinux:8 | nodejs-devel | 1:24.19.0-1.module_el8.10.0+4268+8e07aa5a | ALSA-2026:62583 |
| AlmaLinux:9 | nodejs-devel | 1:22.23.2-1.module_el9.8.0+302+959ebcd4 | ALSA-2026:61383 |
| AlmaLinux:9 | nodejs-devel | 1:24.19.0-1.module_el9.8.0+301+084fac05 | ALSA-2026:61386 |
| AlmaLinux:10 | nodejs-docs | 1:22.23.2-1.el10_2 | ALSA-2026:61376 |
| AlmaLinux:8 | nodejs-docs | 1:24.19.0-1.module_el8.10.0+4268+8e07aa5a | ALSA-2026:62583 |
| AlmaLinux:8 | nodejs-docs | 1:22.23.2-1.module_el8.10.0+4265+75d28086 | ALSA-2026:62219 |
| AlmaLinux:9 | nodejs-docs | 1:24.19.0-1.module_el9.8.0+301+084fac05 | ALSA-2026:61386 |
| AlmaLinux:9 | nodejs-docs | 1:22.23.2-1.module_el9.8.0+302+959ebcd4 | ALSA-2026:61383 |
| AlmaLinux:10 | nodejs-full-i18n | 1:22.23.2-1.el10_2 | ALSA-2026:61376 |
| AlmaLinux:8 | nodejs-full-i18n | 1:24.19.0-1.module_el8.10.0+4268+8e07aa5a | ALSA-2026:62583 |
| AlmaLinux:8 | nodejs-full-i18n | 1:22.23.2-1.module_el8.10.0+4265+75d28086 | ALSA-2026:62219 |
| AlmaLinux:9 | nodejs-full-i18n | 1:22.23.2-1.module_el9.8.0+302+959ebcd4 | ALSA-2026:61383 |
| AlmaLinux:9 | nodejs-full-i18n | 1:24.19.0-1.module_el9.8.0+301+084fac05 | ALSA-2026:61386 |
| AlmaLinux:10 | nodejs-libs | 1:22.23.2-1.el10_2 | ALSA-2026:61376 |
| AlmaLinux:8 | nodejs-libs | 1:22.23.2-1.module_el8.10.0+4265+75d28086 | ALSA-2026:62219 |
| AlmaLinux:8 | nodejs-libs | 1:24.19.0-1.module_el8.10.0+4268+8e07aa5a | ALSA-2026:62583 |
| AlmaLinux:9 | nodejs-libs | 1:24.19.0-1.module_el9.8.0+301+084fac05 | ALSA-2026:61386 |
| AlmaLinux:9 | nodejs-libs | 1:22.23.2-1.module_el9.8.0+302+959ebcd4 | ALSA-2026:61383 |
| AlmaLinux:8 | nodejs-nodemon | 3.1.14-2.module_el8.10.0+4250+09238ed4 | ALSA-2026:62583 |
| AlmaLinux:8 | nodejs-nodemon | 3.1.14-2.module_el8.10.0+4252+aedd4c30 | ALSA-2026:62219 |
| AlmaLinux:9 | nodejs-nodemon | 3.1.14-2.module_el9.8.0+291+0bb98cce | ALSA-2026:61383 |
| AlmaLinux:9 | nodejs-nodemon | 3.1.14-3.module_el9.8.0+292+f4eaf8b2 | ALSA-2026:61386 |
| AlmaLinux:10 | nodejs-npm | 1:10.9.8-1.22.23.2.1.el10_2 | ALSA-2026:61376 |
| AlmaLinux:8 | nodejs-packaging | 2021.06-6.module_el8.10.0+4086+70facd4a | ALSA-2026:62583 |
| AlmaLinux:8 | nodejs-packaging | 2021.06-6.module_el8.10.0+4158+e796f37f | ALSA-2026:62219 |
| AlmaLinux:9 | nodejs-packaging | 2021.06-6.module_el9.7.0+209+ecf6523e | ALSA-2026:61386 |
| AlmaLinux:9 | nodejs-packaging | 2021.06-6.module_el9.7.0+227+12323393 | ALSA-2026:61383 |
| AlmaLinux:8 | nodejs-packaging-bundler | 2021.06-6.module_el8.10.0+4086+70facd4a | ALSA-2026:62583 |
| AlmaLinux:8 | nodejs-packaging-bundler | 2021.06-6.module_el8.10.0+4158+e796f37f | ALSA-2026:62219 |
| AlmaLinux:9 | nodejs-packaging-bundler | 2021.06-6.module_el9.7.0+227+12323393 | ALSA-2026:61383 |
| AlmaLinux:9 | nodejs-packaging-bundler | 2021.06-6.module_el9.7.0+209+ecf6523e | ALSA-2026:61386 |
| AlmaLinux:10 | nodejs24 | 1:24.19.0-1.el10_2 | ALSA-2026:61377 |
| AlmaLinux:10 | nodejs24-devel | 1:24.19.0-1.el10_2 | ALSA-2026:61377 |
| AlmaLinux:10 | nodejs24-docs | 1:24.19.0-1.el10_2 | ALSA-2026:61377 |
| AlmaLinux:10 | nodejs24-full-i18n | 1:24.19.0-1.el10_2 | ALSA-2026:61377 |
| AlmaLinux:10 | nodejs24-libs | 1:24.19.0-1.el10_2 | ALSA-2026:61377 |
| AlmaLinux:10 | nodejs24-npm | 1:11.17.0-1.24.19.0.1.el10_2 | ALSA-2026:61377 |
| AlmaLinux:8 | npm | 1:10.9.8-1.22.23.2.1.module_el8.10.0+4265+75d28086 | ALSA-2026:62219 |
| AlmaLinux:8 | npm | 1:11.17.0-1.24.19.0.1.module_el8.10.0+4268+8e07aa5a | ALSA-2026:62583 |
| AlmaLinux:9 | npm | 1:11.17.0-1.24.19.0.1.module_el9.8.0+301+084fac05 | ALSA-2026:61386 |
| AlmaLinux:9 | npm | 1:10.9.8-1.22.23.2.1.module_el9.8.0+302+959ebcd4 | ALSA-2026:61383 |
| AlmaLinux:8 | v8-12.4-devel | 3:12.4.254.21-1.22.23.2.1.module_el8.10.0+4265+75d28086 | ALSA-2026:62219 |
| AlmaLinux:9 | v8-12.4-devel | 3:12.4.254.21-1.22.23.2.1.module_el9.8.0+302+959ebcd4 | ALSA-2026:61383 |
| AlmaLinux:8 | v8-13.6-devel | 3:13.6.233.17-1.24.19.0.1.module_el8.10.0+4268+8e07aa5a | ALSA-2026:62583 |
| AlmaLinux:9 | v8-13.6-devel | 3:13.6.233.17-1.24.19.0.1.module_el9.8.0+301+084fac05 | ALSA-2026:61386 |
| Alpine:v3.21 | nodejs | 22.23.2-r0 | ALPINE-CVE-2026-56846 |
| Alpine:v3.22 | nodejs | 22.23.2-r0 | ALPINE-CVE-2026-56846 |
| Alpine:v3.23 | nodejs | 24.18.1-r0 | ALPINE-CVE-2026-56846 |
| Alpine:v3.24 | nodejs | 24.18.1-r0 | ALPINE-CVE-2026-56846 |
| Debian:12 | nodejs | 18.20.4+dfsg-1~deb12u3 | DEBIAN-CVE-2026-56846 |
| Debian:13 | nodejs | 20.19.2+dfsg-1+deb13u3 | DEBIAN-CVE-2026-56846 |
| Debian:14 | nodejs | 24.19.0+dfsg+~cs24.13.3-1 | DEBIAN-CVE-2026-56846 |
| Rocky Linux:8 | nodejs | 1:22.23.2-1.module+el8.10.0+40306+15f89705 | RLSA-2026:62219 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.1.14-2.module+el8.10.0+40278+50b003a3 | RLSA-2026:62583 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.1.14-2.module+el8.10.0+40277+b1b3f89e | RLSA-2026:62219 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.1.14-2.module+el8.10.0+40278+50b003a3 | RLSA-2026:62219 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.1.14-2.module+el8.10.0+40277+b1b3f89e | RLSA-2026:62583 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.1.14-3.module+el9.8.0+40281+14cc6568 | RLSA-2026:61386 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.1.14-2.module+el9.8.0+40280+057606e8 | RLSA-2026:61383 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.1.14-2.module+el9.8.0+40264+d9b257bb | RLSA-2026:61383 |
| Rocky Linux:8 | nodejs-packaging | 0:2021.06-6.module+el8.10.0+40172+38f6fdd1 | RLSA-2026:62583 |
| Rocky Linux:8 | nodejs-packaging | 0:2021.06-6.module+el8.10.0+40172+38f6fdd1 | RLSA-2026:62219 |
| Rocky Linux:8 | nodejs-packaging | 0:2021.06-6.module+el8.10.0+40171+8fa9c325 | RLSA-2026:62219 |
| Rocky Linux:8 | nodejs-packaging | 0:2021.06-6.module+el8.10.0+40048+6d99f608 | RLSA-2026:62583 |
| Rocky Linux:8 | nodejs-packaging | 0:2021.06-6.module+el8.10.0+40171+8fa9c325 | RLSA-2026:62583 |
| Rocky Linux:8 | nodejs-packaging | 0:2021.06-6.module+el8.10.0+40048+6d99f608 | RLSA-2026:62219 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-6.module+el9.7.0+40165+d075e3f2 | RLSA-2026:61383 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-6.module+el9.7.0+40052+e32ea525 | RLSA-2026:61386 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-6.module+el9.7.0+40153+4d595597 | RLSA-2026:61386 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-6.module+el9.8.0+40164+8921ab53 | RLSA-2026:61386 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-6.module+el9.7.0+40165+d075e3f2 | RLSA-2026:61386 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-6.module+el9.8.0+40164+8921ab53 | RLSA-2026:61383 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-6.module+el9.7.0+40153+4d595597 | RLSA-2026:61383 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-6.module+el9.7.0+40052+e32ea525 | RLSA-2026:61383 |
| Rocky Linux:10 | nodejs22 | 1:22.23.2-1.el10_2 | RLSA-2026:61376 |
| Rocky Linux:10 | nodejs24 | 1:24.19.0-1.el10_2 | RLSA-2026:61377 |
| Ubuntu:24.04:LTS | nodejs | no fix listed | UBUNTU-CVE-2026-56846 |
| Ubuntu:26.04:LTS | nodejs | no fix listed | UBUNTU-CVE-2026-56846 |
| Ubuntu:26.10 | nodejs | no fix listed | UBUNTU-CVE-2026-56846 |
Affected products (as reported)
Weakness: CWE-400 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H