Vulnerability · Published Aug 4, 2026 · Assigned by hackerone
CVE-2026-56848
High 7.5
In plain English
A high-severity use-after-free 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 44% 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 55.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
A flaw in Node.js HTTP/2 handling allows `nghttp2_session_mem_send()` to be called re-entrantly while `nghttp2_session_mem_recv()` is executing, resulting in a heap-use-after-free. This vulnerability affects Node.js **26.x**, **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-2026-56848 |
| Alpine:v3.22 | nodejs | 22.23.2-r0 | ALPINE-CVE-2026-56848 |
| Alpine:v3.23 | nodejs | 24.18.1-r0 | ALPINE-CVE-2026-56848 |
| Alpine:v3.24 | nodejs | 24.18.1-r0 | ALPINE-CVE-2026-56848 |
| Alpine:v3.24 | nodejs-current | 26.5.1-r0 | ALPINE-CVE-2026-56848 |
| Debian:12 | nodejs | 18.20.4+dfsg-1~deb12u3 | DEBIAN-CVE-2026-56848 |
| Debian:13 | nodejs | 20.19.2+dfsg-1+deb13u3 | DEBIAN-CVE-2026-56848 |
| Debian:14 | nodejs | 24.19.0+dfsg+~cs24.13.3-1 | DEBIAN-CVE-2026-56848 |
| 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-2026:62219 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.1.14-2.module+el8.10.0+40277+b1b3f89e | RLSA-2026:62583 |
| 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: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+40264+d9b257bb | RLSA-2026:61383 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.1.14-2.module+el9.8.0+40280+057606e8 | 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-2026:62219 |
| 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-2026:62583 |
| 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+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: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+el9.7.0+40052+e32ea525 | 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+el9.7.0+40165+d075e3f2 | RLSA-2026:61383 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-6.module+el9.8.0+40164+8921ab53 | 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-2026-56848 |
| Ubuntu:26.04:LTS | nodejs | no fix listed | UBUNTU-CVE-2026-56848 |
| Ubuntu:26.10 | nodejs | no fix listed | UBUNTU-CVE-2026-56848 |
Affected products (as reported)
Weakness: CWE-416 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H