CVE-2026-5440

Memory Exhaustion via Unbounded Content-Length

High · published April 9, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
60.7
In the wild
Unconfirmed
What it is

A memory exhaustion vulnerability exists in the HTTP server due to unbounded use of the `Content-Length` header. The server allocates memory directly based on the attacker supplied header value without enforcing an upper limit. A crafted HTTP request containing an extremely large `Content-Length` value can trigger excessive memory allocation and server termination, even without sending a request body.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00944 · 60.7th percentile
Published
2026-04-09T14:43Z
EPSS history
Timeline
  • 09 APR 14:43Z
    Memory Exhaustion via Unbounded Content-Length
    cvelistv5