High [CVE-2026-87776] Denial of Service via memory leak on premature response close
This high-severity Red Hat Linux advisory covers CVE-2026-87776 affecting Gatekeeper 3, Migration Toolkit for Containers, Node HealthCheck Operator.
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Summary
A flaw was found in the `compression` Node.js and Express middleware. A remote unauthenticated attacker can exploit this vulnerability by repeatedly initiating and then prematurely aborting connections while compressed responses are being sent.
This action prevents the zlib stream, used for compression, from being properly destroyed, leading to a memory leak. Over time, this memory exhaustion can cause the server to crash, resulting in a Denial of Service (DoS).
Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-772.
Affected products named by the advisory: Gatekeeper 3; Migration Toolkit for Containers; Node HealthCheck Operator; OpenShift Lightspeed; and 29 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 43 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 43 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 43 minutes ago·verify at source
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