CVE catalog
CVE-2026-88829
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 h
- Severity
- High · CVSS 7.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.26% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | busybox | sid | 1:1.38.0-3 | vulnerable |
| Debian | busybox | forky | 1:1.38.0-3 | vulnerable |
| Debian | busybox | trixie | 1:1.37.0-6 | vulnerable |
| Debian | busybox | bookworm | 1:1.35.0-4+deb12u1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | busybox | source | sid | (unfixed) | not yet assigned | Not reported | [1151677] |
| Debian | busybox | source | forky | (unfixed) | not yet assigned | Not reported | [1151677] |
| Debian | busybox | source | trixie | (unfixed) | not yet assigned | Not reported | [1151677] |
| Debian | busybox | source | bookworm | (unfixed) | not yet assigned | Not reported | [1151677] |
Notes
[trixie] busybox: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [busybox]Affected
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1+b1· amd64 · bookwormAffected
nvd · busybox · debian · bookworm
1:1.35.0-4+deb12u1+b1· arm64 · bookwormAffected
nvd · busybox · debian · bookworm
- [busybox-static]Affected
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1+b1· amd64 · bookwormAffected
nvd · busybox · debian · bookworm
1:1.35.0-4+deb12u1+b1· arm64 · bookwormAffected
nvd · busybox · debian · bookworm
- [busybox-syslogd]Affected
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1· all · bookwormAffected
nvd · busybox · debian · bookworm
1:1.35.0-4+deb12u1· all · bookwormAffected
nvd · busybox · debian · bookworm
- [udhcpc]Affected
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1+b1· amd64 · bookwormAffected
nvd · busybox · debian · bookworm
1:1.35.0-4+deb12u1+b1· arm64 · bookwormAffected
nvd · busybox · debian · bookworm
- [udhcpd]Affected
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1+b1· amd64 · bookwormAffected
nvd · busybox · debian · bookworm
1:1.35.0-4+deb12u1+b1· arm64 · bookwormAffected
nvd · busybox · debian · bookworm
Observed:
References
- [https://ftp.suse.com/pub/projects/security/]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-88829]
- [https://security-tracker.debian.org/tracker/CVE-2026-88829]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88829.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3953.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]