All vulnerabilities
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**.

nodejs nodeRuntimes & languages
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CVSS
7.5High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.50%Chance of exploitation activity in the next 30 days, higher than 41% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published4 Aug 2026Updated 4 Aug 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Timeline

  1. 4 Aug 2026, 00:49 UTCPublishedCVE List
  2. 23 Oct 2026, 23:43 UTCExploit code publicGitHub proof-of-concept repositories

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

Affected versions 2

  • nodeaffected: 24.18.0 through 24.18.0CVE List
  • nodeaffected: 22.23.1 through 22.23.1CVE List

References 1