High severity · published Oct 14, 2026
CVE-2026-88829
Busybox: busybox: http request smuggling via pipelined requests in httpd reverse proxy
7.2
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Hardened Images · Red Hat
All versions, or not specified · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-88829
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-88829
vdb-entry
https://access.redhat.com/security/cve/CVE-2026-88829
issue-tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2531343
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