CVE-2026-87776: Compression

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Compression Compression: before 1.8.2 (fixed in 1.8.2)

Published 2026-09-11. Last modified 2026-09-16.