High [CVE-2026-56846] Remote memory exhaustion via HTTP/2 retained header blocks
This high-severity Red Hat Linux advisory covers CVE-2026-56846.
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Summary
Remote memory exhaustion via HTTP/2 retained header blocks. Red Hat rates this important (CVSS 7.5).
Weakness: CWE-400. Red Hat lists fixing advisory RHSA-2026:48305 with package nodejs22-main-22.23.2-2.3.hum1, nodejs24-main-24.18.1-0.1.hum1.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- nodejs22-main-22.23.2-2.3.hum1
- nodejs24-main-24.18.1-0.1.hum1
- RHSA-2026:48305
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- To mitigate this issue, restrict network access to Node.js applications utilizing HTTP/2 to trusted clients only, by implementing firewall rules or network access controls. If HTTP/2 functionality is not essential for the application, consider disabling it in the Node.js configuration to prevent exploitation. Always ensure that any service restarts or reloads are performed carefully to avoid service disruption.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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