compression vulnerable to Denial of Service via memory leak on premature response close
Impact
A vulnerability in compression < 1.8.2 allows an attacker to trigger a Denial of Service (DoS) by disconnecting while a compressed response is being sent. When the client aborts the connection before the response finishes, the zlib stream created to compress that response is never destroyed, so each aborted compressed response leaks its native zlib memory. Repeated aborted requests can exhaust available memory. All applications using compression are affected.
Patches
Users should upgrade to 1.8.2.
Workarounds
None.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | compression | < 1.8.2 | 1.8.2 |
References
- https://github.com/expressjs/compression/security/advisories/GHSA-vc2v-76pw-4v95
- https://nvd.nist.gov/vuln/detail/CVE-2026-87776
- https://github.com/expressjs/compression/commit/151f63e91e1b64f8fb0b064e19321a4f28db6bff
- https://cna.openjsf.org/security-advisories.html
- https://github.com/expressjs/compression
- https://github.com/expressjs/compression/releases/tag/v1.8.2
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-401, CWE-459- Platform
- npm
- Package
compression- Disclosed
- 05.10.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-vc2v-76pw-4v95 - CC BY 4.0
Vulnerability history: compression
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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