CVE-2026-88829

HIGH 7.2

Busybox: busybox: http request smuggling via pipelined requests in httpd reverse proxy

CVSS Score

7.2

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-444
Vendor	red hat
Product	red hat hardened images
Published	Oct 14, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

Red Hat / Red Hat Hardened Images

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-88829 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2531343

Credits

Red Hat would like to thank Shubham Raj (Causal Security) for reporting this issue.