CVE catalog

CVE-2026-56846

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**.

[CVE catalog]

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Jul 29, 2026, 10:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.50% · Oct 25, 2026

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**.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	nodejs	sid	`24.22.1+dfsg+~cs24.19.2-1`	fixed
Debian	nodejs	forky	`24.21.0+dfsg+~cs24.13.4-1`	fixed
Debian	nodejs	trixie	`20.19.2+dfsg-1+deb13u2`	vulnerable
Debian	nodejs	trixie-security	`20.19.2+dfsg-1+deb13u3`	fixed
Debian	nodejs	bookworm	`18.20.4+dfsg-1~deb12u2`	vulnerable
Debian	nodejs	bookworm-security	`18.20.4+dfsg-1~deb12u3`	fixed
Alpine	nodejs	3.21	`22.23.2-r0`	fixed
Alpine	nodejs	3.22	`22.23.2-r0`	fixed
Alpine	nodejs	3.23	`24.18.1-r0`	fixed
Alpine	nodejs	3.24	`24.18.1-r0`	fixed
Opensuse	nodejs26	tumbleweed	`26.5.1-1.1`	fixed
Opensuse	nodejs24	tumbleweed	`24.18.1-1.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	nodejs	source	sid	`24.19.0+dfsg+~cs24.13.3-1`	not yet assigned	Not reported	Not reported
Debian	nodejs	source	forky	`24.19.0+dfsg+~cs24.13.3-1`	not yet assigned	Not reported	Not reported
Debian	nodejs	source	trixie	`20.19.2+dfsg-1+deb13u3`	not yet assigned	Not reported	Not reported
Debian	nodejs	source	bookworm	`18.20.4+dfsg-1~deb12u3`	not yet assigned	Not reported	Not reported
Alpine	nodejs	apk	3.21	`22.23.2-r0`	Not reported	ALPINE-CVE-2026-56846	Not reported
Alpine	nodejs	apk	3.22	`22.23.2-r0`	Not reported	ALPINE-CVE-2026-56846	Not reported
Alpine	nodejs	apk	3.23	`24.18.1-r0`	Not reported	ALPINE-CVE-2026-56846	Not reported
Alpine	nodejs	apk	3.24	`24.18.1-r0`	Not reported	ALPINE-CVE-2026-56846	Not reported
Opensuse	nodejs26	rpm	tumbleweed	`26.5.1-1.1`	Not reported	OPENSUSE-SU-2026:11440-1	Not reported
Opensuse	nodejs24	rpm	tumbleweed	`24.18.1-1.1`	Not reported	OPENSUSE-SU-2026:11439-1	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libnode108]Affected
Source package: [nodejs]
Details (4)
- 18.20.4+dfsg-1~deb12u2 · amd64 · bookworm
  Affected · Fixed: 18.20.4+dfsg-1~deb12u3
  nvd · nodejs · debian · bookworm; nvd · nodejs · debian · 12
- 18.20.4+dfsg-1~deb12u2 · arm64 · bookworm
  Affected · Fixed: 18.20.4+dfsg-1~deb12u3
  nvd · nodejs · debian · bookworm; nvd · nodejs · debian · 12
- 18.20.4+dfsg-1~deb12u2 · amd64 · bookworm-security
  Affected · Fixed: 18.20.4+dfsg-1~deb12u3
  nvd · nodejs · debian · bookworm; nvd · nodejs · debian · 12
- 18.20.4+dfsg-1~deb12u2 · arm64 · bookworm-security
  Affected · Fixed: 18.20.4+dfsg-1~deb12u3
  nvd · nodejs · debian · bookworm; nvd · nodejs · debian · 12
[libnode-dev]Affected
Source package: [nodejs]
Details (4)
- 18.20.4+dfsg-1~deb12u2 · amd64 · bookworm
  Affected · Fixed: 18.20.4+dfsg-1~deb12u3
  nvd · nodejs · debian · bookworm; nvd · nodejs · debian · 12
- 18.20.4+dfsg-1~deb12u2 · arm64 · bookworm
  Affected · Fixed: 18.20.4+dfsg-1~deb12u3
  nvd · nodejs · debian · bookworm; nvd · nodejs · debian · 12
- 18.20.4+dfsg-1~deb12u2 · amd64 · bookworm-security
  Affected · Fixed: 18.20.4+dfsg-1~deb12u3
  nvd · nodejs · debian · bookworm; nvd · nodejs · debian · 12
- 18.20.4+dfsg-1~deb12u2 · arm64 · bookworm-security
  Affected · Fixed: 18.20.4+dfsg-1~deb12u3
  nvd · nodejs · debian · bookworm; nvd · nodejs · debian · 12
[nodejs]Affected
Details (4)
- 18.20.4+dfsg-1~deb12u2 · amd64 · bookworm
  Affected · Fixed: 18.20.4+dfsg-1~deb12u3
  nvd · nodejs · debian · bookworm; nvd · nodejs · debian · 12
- 18.20.4+dfsg-1~deb12u2 · arm64 · bookworm
  Affected · Fixed: 18.20.4+dfsg-1~deb12u3
  nvd · nodejs · debian · bookworm; nvd · nodejs · debian · 12
- 18.20.4+dfsg-1~deb12u2 · amd64 · bookworm-security
  Affected · Fixed: 18.20.4+dfsg-1~deb12u3
  nvd · nodejs · debian · bookworm; nvd · nodejs · debian · 12
- 18.20.4+dfsg-1~deb12u2 · arm64 · bookworm-security
  Affected · Fixed: 18.20.4+dfsg-1~deb12u3
  nvd · nodejs · debian · bookworm; nvd · nodejs · debian · 12
[nodejs-doc]Affected
Source package: [nodejs]
Details (4)
- 18.20.4+dfsg-1~deb12u2 · all · bookworm
  Affected · Fixed: 18.20.4+dfsg-1~deb12u3
  nvd · nodejs · debian · bookworm; nvd · nodejs · debian · 12
- 18.20.4+dfsg-1~deb12u2 · all · bookworm
  Affected · Fixed: 18.20.4+dfsg-1~deb12u3
  nvd · nodejs · debian · bookworm; nvd · nodejs · debian · 12
- 18.20.4+dfsg-1~deb12u2 · all · bookworm-security
  Affected · Fixed: 18.20.4+dfsg-1~deb12u3
  nvd · nodejs · debian · bookworm; nvd · nodejs · debian · 12
- 18.20.4+dfsg-1~deb12u2 · all · bookworm-security
  Affected · Fixed: 18.20.4+dfsg-1~deb12u3
  nvd · nodejs · debian · bookworm; nvd · nodejs · debian · 12

[Debian 13 (Trixie)]

[libnode115]Affected
Source package: [nodejs]
Details (5)
- 20.19.2+dfsg-1+deb13u2 · amd64 · trixie
  Affected · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
- 20.19.2+dfsg-1+deb13u2 · arm64 · trixie
  Affected · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
- 20.19.2+dfsg-1+deb13u2 · amd64 · trixie-security · Historical version
  Affected · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
- 20.19.2+dfsg-1+deb13u2 · arm64 · trixie-security
  Affected · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
- 20.19.2+dfsg-1+deb13u3 · amd64 · trixie-security
  Fixed · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
[libnode-dev]Affected
Source package: [nodejs]
Details (5)
- 20.19.2+dfsg-1+deb13u2 · amd64 · trixie
  Affected · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
- 20.19.2+dfsg-1+deb13u2 · arm64 · trixie
  Affected · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
- 20.19.2+dfsg-1+deb13u2 · amd64 · trixie-security · Historical version
  Affected · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
- 20.19.2+dfsg-1+deb13u2 · arm64 · trixie-security
  Affected · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
- 20.19.2+dfsg-1+deb13u3 · amd64 · trixie-security
  Fixed · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
[nodejs]Affected
Details (5)
- 20.19.2+dfsg-1+deb13u2 · amd64 · trixie
  Affected · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
- 20.19.2+dfsg-1+deb13u2 · arm64 · trixie
  Affected · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
- 20.19.2+dfsg-1+deb13u2 · amd64 · trixie-security · Historical version
  Affected · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
- 20.19.2+dfsg-1+deb13u2 · arm64 · trixie-security
  Affected · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
- 20.19.2+dfsg-1+deb13u3 · amd64 · trixie-security
  Fixed · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
[nodejs-doc]Affected
Source package: [nodejs]
Details (5)
- 20.19.2+dfsg-1+deb13u2 · all · trixie
  Affected · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
- 20.19.2+dfsg-1+deb13u2 · all · trixie
  Affected · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
- 20.19.2+dfsg-1+deb13u2 · all · trixie-security
  Affected · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
- 20.19.2+dfsg-1+deb13u2 · all · trixie-security · Historical version
  Affected · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13
- 20.19.2+dfsg-1+deb13u3 · all · trixie-security
  Fixed · Fixed: 20.19.2+dfsg-1+deb13u3
  nvd · nodejs · debian · 13

[openSUSE Tumbleweed]

[corepack24]Unknown
Source package: [nodejs24]
Details (1)
- 24.18.1-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 24.18.1-1.1
  Version impact unknown
  nvd · nodejs24 · opensuse · tumbleweed
[nodejs24-devel]Unknown
Source package: [nodejs24]
Details (1)
- 24.18.1-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 24.18.1-1.1
  Version impact unknown
  nvd · nodejs24 · opensuse · tumbleweed
[nodejs24-docs]Unknown
Source package: [nodejs24]
Details (1)
- 24.18.1-1.1 · noarch · tumbleweed
  Unknown · Fixed: 24.18.1-1.1
  Version impact unknown
  nvd · nodejs24 · opensuse · tumbleweed
[nodejs26-devel]Unknown
Source package: [nodejs26]
Details (1)
- 26.7.0-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 26.5.1-1.1
  Version impact unknown
  nvd · nodejs26 · opensuse · tumbleweed
[nodejs26-docs]Unknown
Source package: [nodejs26]
Details (1)
- 26.7.0-1.1 · noarch · tumbleweed
  Unknown · Fixed: 26.5.1-1.1
  Version impact unknown
  nvd · nodejs26 · opensuse · tumbleweed
[npm24]Unknown
Source package: [nodejs24]
Details (1)
- 24.18.1-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 24.18.1-1.1
  Version impact unknown
  nvd · nodejs24 · opensuse · tumbleweed
[npm26]Unknown
Source package: [nodejs26]
Details (1)
- 26.7.0-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 26.5.1-1.1
  Version impact unknown
  nvd · nodejs26 · opensuse · tumbleweed
[nodejs24]Fixed
Source package: [nodejs24]
Details (1)
- 24.18.1-1.1 · x86_64 · tumbleweed
  Fixed · Fixed: 24.18.1-1.1
  nvd · nodejs24 · opensuse · tumbleweed
[nodejs26]Fixed
Source package: [nodejs26]
Details (1)
- 26.7.0-1.1 · x86_64 · tumbleweed
  Fixed · Fixed: 26.5.1-1.1
  nvd · nodejs26 · opensuse · tumbleweed

Observed: Oct 27, 2026, 7:11:22 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]