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CVE-2026-87776

compression vulnerable to Denial of Service via memory leak on premature response close

CVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-87776

Published

compression is a Node.js and Express compression middleware. In versions before 1.8.2, when a client aborts the connection while a compressed response is still being sent, the zlib stream created to compress that response is never destroyed, so each aborted compressed response leaks its native zlib memory. A remote unauthenticated attacker can repeatedly open requests and disconnect early, exhausting the available memory and crashing the server. All applications using compression are affected. The issue is fixed in compression 1.8.2, and users should upgrade to 1.8.2 or later.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-87776

Published

compression

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "compression",
                    "product": "compression",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "versionType": "semver",
                            "status": "affected",
                            "version": "0",
                            "lessThan": "1.8.2"
                        },
                        {
                            "versionType": "semver",
                            "status": "unaffected",
                            "version": "1.8.2"
                        }
                    ],
                    "packageURL": "pkg:npm/compression"
                }

Original source record · Cite this exact observation · Complete original publisher JSON