Missing Release of Memory after Effective Lifetime Affecting compression package, versions <1.8.2
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-COMPRESSION-19778377
- published14 Sept 2026
- disclosed11 Sept 2026
- creditKKamJi98
Introduced: 11 Sep 2026
NewCVE-2026-87776 (opens in a new tab)How to fix?
Upgrade compression to version 1.8.2 or higher.
Overview
Affected versions of this package are vulnerable to Missing Release of Memory after Effective Lifetime via improper cleanup of the zlib compression stream when a client disconnects before the response finishes. The onResponseClose handler was absent, leaving native zlib handles unreleased whenever a connection closed mid-response. An attacker can exhaust server memory or file-descriptor resources by repeatedly opening connections and disconnecting before response completion, causing a denial of service.