CVE-2026-88829CWE-444

CVE-2026-88829

High · published October 14, 2026

CVSS v3.1
7.2
EPSS
0%
Percentile
23.4
In the wild
Unconfirmed
What it is

A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is configured to forward requests matching a URL prefix to a backend server, only the first HTTP request on a TCP connection has its path rewritten. An attacker can send a pipelined second request that is relayed verbatim to the backend, bypassing the configured path restrictions. This allows accessing arbitrary paths on the backend server that were not intended to be exposed through the proxy.

The record
Technical detail
CVSS v3.1
7.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00317 · 23.4th percentile
Weakness
CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Published
2026-10-14T14:17Z
References (2)
https://access.redhat.com/security/cve/CVE-2026-88829 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2531343 · [email protected]
EPSS history
Timeline
  • 15 OCT 03:35Z
    EPSS moved — → 0%
    epss
  • 14 OCT 10:00Z
    Busybox: busybox: http request smuggling via pipelined requests in httpd reverse proxy
    cvelistv5
  • 14 OCT 10:00Z
    Busybox: busybox: http request smuggling via pipelined requests in httpd reverse proxy
    cvelistv5