CVE-2026-87776
Published: September 11th, 2026
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.
HIGH
CVSS v3: 7.5
CVSS v3: 7.5
Status
| DocFilters Release | Package | State | Justification | Comment |
|---|---|---|---|---|
| daily | zlib (1.3) | Needs Triage | ||
| 26.3 | zlib (1.3) | Needs Triage | ||
| 26.2 | zlib (1.3) | Needs Triage | ||
| 26.1 | zlib (1.3) | Needs Triage | ||
| 25.4 | zlib (1.3) | Needs Triage | ||
| 25.3 | zlib (1.3) | Needs Triage | ||
| 25.2 | zlib (1.3) | Needs Triage | ||
| 25.1 | zlib (1.3) | Needs Triage | ||
| 24.4 | zlib (1.3) | Needs Triage | ||
| 24.4.0 | zlib (1.3) | Needs Triage | ||
| 24.3 | zlib (1.3) | Needs Triage | ||
| 24.2 | zlib (1.3) | Needs Triage | ||
| 24.1 | zlib (1.3) | Needs Triage | ||
| 23.3 | zlib (1.3) | Needs Triage | ||
| 23.2 | zlib (1.2.12) | Needs Triage | ||
| 23.1 | zlib (1.2.12) | Needs Triage | ||
| 22.4 | zlib (1.2.12) | Needs Triage | ||
| 22.3 | zlib (1.2.12) | Needs Triage | ||
| 22.2 | zlib (1.2.12) | Needs Triage | ||
| 22.1 | zlib (1.2.11) | Needs Triage | ||
| 21.11 | zlib (1.2.11) | Needs Triage | ||
| 21.8 | zlib (1.2.11) | Needs Triage | ||
| 21.5.0 | zlib (1.2.11) | Needs Triage | ||
| 21.2.0 | zlib (1.2.11) | Needs Triage | ||
| 11.4.19.3667 | zlib (1.2.11) | Needs Triage | ||
| 11.4.18.3599 | zlib (1.2.11) | Needs Triage | ||
| 11.4.16.3445 | zlib (1.2.11) | Needs Triage | ||
| 11.4.15.3368 | zlib (1.2.11) | Needs Triage | ||
| 11.4.14.3263 | zlib (1.2.11) | Needs Triage | ||
| 11.4.13.3179 | zlib (1.2.11) | Needs Triage | ||
| 11.4.12.3054 | zlib (1.2.11) | Needs Triage | ||
| 11.4.11.3040 | zlib (1.2.11) | Needs Triage | ||
| 11.4.11.2990 | zlib (1.2.11) | Needs Triage | ||
| 11.4.10.2934 | zlib (1.2.11) | Needs Triage | ||
| 11.4.9.2878 | zlib (1.2.11) | Needs Triage | ||
| 11.4.8.2822 | zlib (1.2.11) | Needs Triage |
Severity score breakdown
Attack Complexity
LOW
Attack Vector
NETWORK
Availability Impact
HIGH
Base Score
7.5
Base Severity
HIGH
Confidentiality Impact
NONE
Integrity Impact
NONE
Privileges Required
NONE
Scope
UNCHANGED
User Interaction
NONE
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Version
3.1