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CVE-2026-88829

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

7.2 High

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.26%Down 0.1 points since Oct 14, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.2

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

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.

Record
CVE-2026-88829
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness
CWE-444
Updated
2026-11-02
EUVDEUVD-2026-100952 7.2

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.

Record
EUVD-2026-100952
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-89f7-8rmh-f5q2 7.2

A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is configured to...

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.

Record
GHSA-89f7-8rmh-f5q2
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness
CWE-444
Updated
2026-11-02
NVD 7.2

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.

Record
CVE-2026-88829
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness
CWE-444
Updated
2026-11-02
OSVBELL-CVE-2026-88829 7.2
Record
BELL-CVE-2026-88829
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2026-88829 7.2

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.

Record
DEBIAN-CVE-2026-88829
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-88829 7.2

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.

Record
UBUNTU-CVE-2026-88829
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Updated
2026-11-02
OSVAZL-109779 No score

CVE-2026-88829 affecting package busybox 1.36.1-28

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.

Record
AZL-109779
Updated
2026-11-05
OSVopenSUSE-SU-2026:12376-1 No score

busybox-1.38.0-4.1 on GA media

These are all security issues fixed in the busybox-1.38.0-4.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:12376-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
busybox
Azure Linux:3
 through 1.36.1-28 None known
busybox
Alpaquita:23
 1.35.0-r29 and later None known
busybox
Alpaquita:25
 1.37.0-r20 and later None known
busybox
Alpaquita:stream
 1.36.1-r1 and later None known
busybox
Debian:12
 All versions, plus listed versions
1:1.35.0-41:1.35.0-4+deb12u11:1.36.0-1~exp11:1.36.1-11:1.36.1-2
Show 23 moreShow less
1:1.36.1-31:1.36.1-3.11:1.36.1-41:1.36.1-51:1.36.1-61:1.36.1-6~exp.11:1.36.1-71:1.36.1-81:1.36.1-91:1.37.0-11:1.37.0-101:1.37.0-10.11:1.37.0-21:1.37.0-31:1.37.0-41:1.37.0-51:1.37.0-61:1.37.0-71:1.37.0-81:1.37.0-91:1.38.0-11:1.38.0-21:1.38.0-3
 None known
busybox
Debian:13
 All versions, plus listed versions
1:1.37.0-101:1.37.0-10.11:1.37.0-61:1.37.0-71:1.37.0-8
Show 4 moreShow less
1:1.37.0-91:1.38.0-11:1.38.0-21:1.38.0-3
 None known
busybox
Debian:14
 All versions, plus listed versions
1:1.37.0-101:1.37.0-10.11:1.37.0-61:1.37.0-71:1.37.0-8
Show 4 moreShow less
1:1.37.0-91:1.38.0-11:1.38.0-21:1.38.0-3
 None known
busybox
Ubuntu:Pro:14.04:LTS
 All versions, plus listed versions
1:1.20.0-8.1ubuntu11:1.20.0-9ubuntu11:1.20.0-9ubuntu21:1.21.0-1ubuntu11:1.21.0-1ubuntu1.41:1.21.0-1ubuntu1.4+esm1
 None known
busybox
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
1:1.22.0-15ubuntu11:1.22.0-15ubuntu1.41:1.22.0-15ubuntu1.4+esm11:1.22.0-15ubuntu1.4+esm2
 None known
busybox
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
1:1.22.0-19ubuntu21:1.27.2-1ubuntu31:1.27.2-1ubuntu41:1.27.2-2ubuntu21:1.27.2-2ubuntu3
Show 5 moreShow less
1:1.27.2-2ubuntu3.11:1.27.2-2ubuntu3.21:1.27.2-2ubuntu3.31:1.27.2-2ubuntu3.41:1.27.2-2ubuntu3.4+esm1
 None known
Show 6 moreShow less
Affected packages
PackageAffectedFixed
busybox
Ubuntu:20.04:LTS
 All versions, plus listed versions
1:1.30.1-4ubuntu41:1.30.1-4ubuntu51:1.30.1-4ubuntu61:1.30.1-4ubuntu6.11:1.30.1-4ubuntu6.21:1.30.1-4ubuntu6.31:1.30.1-4ubuntu6.41:1.30.1-4ubuntu6.5
 None known
busybox
Ubuntu:22.04:LTS
 All versions, plus listed versions
1:1.30.1-6ubuntu31:1.30.1-7ubuntu11:1.30.1-7ubuntu21:1.30.1-7ubuntu31:1.30.1-7ubuntu3.1
 None known
busybox
Ubuntu:24.04:LTS
 All versions, plus listed versions
1:1.36.1-3ubuntu11:1.36.1-6ubuntu11:1.36.1-6ubuntu31:1.36.1-6ubuntu3.1
 None known
busybox
Ubuntu:26.10
 All versions, plus listed versions
1:1.37.0-7ubuntu11:1.37.0-10.1ubuntu21:1.37.0-10.1ubuntu31:1.38.0-3ubuntu11:1.38.0-3ubuntu31:1.38.0-3ubuntu4
 None known
busybox
Ubuntu:26.04:LTS
 All versions, plus listed versions
1:1.37.0-4ubuntu11:1.37.0-7ubuntu1
 None known
busybox
openSUSE:Tumbleweed
From an advisory covering 8 CVEs
 before 1.38.0-4.1
1.38.0-4.1

History

History
RecordedChangedSources
affected, facts
factsOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-88829 is a high vulnerability (CVSS 7.2) in Red Hat Hardened Images, published October 14, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.26%, the 17th percentile. No source names a fixed version.

References

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