| Name | CVE-2026-56846 |
| 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**. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| nodejs (PTS) | bookworm, bookworm (security) | 18.20.4+dfsg-1~deb12u2 | vulnerable |
| trixie (security), trixie | 20.19.2+dfsg-1+deb13u2 | vulnerable |
| forky | 24.19.0+dfsg+~cs24.13.3-1 | fixed |
| sid | 24.20.0+dfsg+~cs24.13.3-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| nodejs | source | (unstable) | 24.19.0+dfsg+~cs24.13.3-1 | | | |
Notes
https://nodejs.org/en/blog/vulnerability/july-2026-security-releases#http2-retained-headers-can-bypass-maxsessionmemory-limits-cve-2026-56846---high
Fixed by: https://github.com/nodejs/node/commit/f14d78b9e0201bfe0291f2b0dc4b5d88c70cc28e (v22.23.2)