CVE-2026-56846
published 2026-08-04CVE-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…
PriorityP343high7.5CVSS 3.0
AVNACLPRNUINSUCNINAH
EPSS
0.50%
41.2th percentile
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
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| nodejs | node | 22.23.1 – 22.23.1 | — |
| nodejs | node | 24.18.0 – 24.18.0 | — |
| nodejs | nodejs | — | — |
| nodejs_22 | nodejs | — | — |
| nodejs_24 | nodejs | — | — |
CVSS provenance
nvdv3.07.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vendor_redhat7.5HIGH
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Red Hat
nodejs: Node.js: Remote memory exhaustion via HTTP/2 retained header blocks
vendor_redhat·2026-08-04·CVSS 7.5
CVE-2026-56846 [HIGH] CWE-400 nodejs: Node.js: Remote memory exhaustion via HTTP/2 retained header blocks
nodejs: Node.js: Remote memory exhaustion via HTTP/2 retained header blocks
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**.
A flaw was found in Node.js's handling of HTTP/2. This vulnerability allows a remote attacker to bypass maxSessionMemory limits by sending specially crafted HTTP/2 retained header blocks. This can lead to memory exhaustion, resulting in a denial of service (DoS) for the affected system.
Statement: This Important flaw in Node.js HTTP/2 handling allows a remote attacker to bypass `maxSessionMemory` limits by sending specially crafted header blocks. This can lead to memory exhaustion and a denial of service for Node.js applica
GHSA
A flaw in Node.js HTTP/2 handling can cause HTTP/2 retained header blocks evade maxSessionMemory and enable remote memory exhaustion.
ghsa_unreviewed·2026-08-04
CVE-2026-56846 [HIGH] CWE-400 A flaw in Node.js HTTP/2 handling can cause HTTP/2 retained header blocks evade maxSessionMemory and enable remote memory exhaustion.
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**.
VulDB
nodejs Node.js up to 22.23.1/24.18.0 HTTP/2 memory allocation
vuldb·2026-08-04·CVSS 7.5
CVE-2026-56846 [HIGH] nodejs Node.js up to 22.23.1/24.18.0 HTTP/2 memory allocation
A vulnerability was found in nodejs Node.js up to 22.23.1/24.18.0. It has been declared as problematic. This affects an unknown function of the component HTTP2. The manipulation results in uncontrolled memory allocation.
This vulnerability is cataloged as CVE-2026-56846. The attack may be launched remotely. There is no exploit available.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-56846 nodejs24: Node.js: Remote memory exhaustion via HTTP/2 retained header blocks [fedora-all]
bugzilla·2026-08-06·CVSS 7.5
CVE-2026-56846 [HIGH] CVE-2026-56846 nodejs24: Node.js: Remote memory exhaustion via HTTP/2 retained header blocks [fedora-all]
CVE-2026-56846 nodejs24: Node.js: Remote memory exhaustion via HTTP/2 retained header blocks [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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**.
Bugzilla
CVE-2026-56846 nodejs22: Node.js: Remote memory exhaustion via HTTP/2 retained header blocks [fedora-all]
bugzilla·2026-08-06·CVSS 7.5
CVE-2026-56846 [HIGH] CVE-2026-56846 nodejs22: Node.js: Remote memory exhaustion via HTTP/2 retained header blocks [fedora-all]
CVE-2026-56846 nodejs22: Node.js: Remote memory exhaustion via HTTP/2 retained header blocks [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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**.
Bugzilla
CVE-2026-56846 nodejs: Node.js: Remote memory exhaustion via HTTP/2 retained header blocks
bugzilla·2026-08-04·CVSS 7.5
CVE-2026-56846 [HIGH] CVE-2026-56846 nodejs: Node.js: Remote memory exhaustion via HTTP/2 retained header blocks
CVE-2026-56846 nodejs: Node.js: Remote memory exhaustion via HTTP/2 retained header blocks
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**.
2026-08-04
Published