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CVE-2026-88829— Busybox: busybox: http request smuggling via pipelined requests in httpd reverse proxy

Quick assessment

Affected
Red Hat Red Hat Hardened Images
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 BusyBox httpd 的反向代理功能中发现了一个缺陷。当反向代理被配置为将匹配特定 URL 前缀的请求转发到后端服务器时，仅在一个 TCP 连接上的第一个 HTTP 请求的路径会被正确重写。攻击者可以发送一个经过管道化（pipelined）的第二个请求，该请求会被原封不动地转发给后端服务器，从而绕过所配置的路径限制。这使得攻击者能够访问后端服务器上本不应通过反向代理暴露的任意路径。

CVSS 7.2 · High EPSS 0.32% · P23

Affected Version Matrix 1

VendorProduct Version RangeStatus
Red Hat Red Hat Hardened Images any affected
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I. Basic Information for CVE-2026-88829

Vulnerability Information
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Vulnerability Title
Busybox: busybox: http request smuggling via pipelined requests in httpd reverse proxy
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Hardened Images - cpe:/a:redhat:hummingbird:1

II. Public POCs for CVE-2026-88829

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III. Intelligence Information for CVE-2026-88829

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Vendor Advisories for CVE-2026-88829 (2)

Same Patch Batch · Red Hat · 2026-10-14 · 25 CVEs total

CVE-2026-104795 8.8 HIGH Insights-runtime-extractor: insights-runtime-extractor: container escape via privileged bi
CVE-2026-86848 8.8 HIGH Dpdk: dpdk: time-of-check/time-of-use vulnerability allowing guest-triggered out-of-bounds
CVE-2026-86567 8.8 HIGH Dpdk: dpdk: vduse handler fails to invalidate vring pointers when iotlb is invalidated, le
CVE-2026-100236 8.6 HIGH Dpdk: dpdk: heap out-of-bounds read/write in gso header copy
CVE-2026-86476 8.4 HIGH Gstreamer1-plugins-base: gst-plugins-base: heap buffer overflow via unvalidated gstvideome
CVE-2026-86565 8.2 HIGH Dpdk: dpdk: guest can desynchronize virtqueue size from inflight descriptor table size, ca
CVE-2026-90954 7.8 HIGH Busybox: busybox: dpkg-deb extraction-root escape via per-ar-member deferred symlink flush
CVE-2026-86563 7.8 HIGH Dpdk: dpdk: double offset bug in vhost log mapping calculation
CVE-2026-86562 7.8 HIGH Dpdk: dpdk: control-queue descriptor double-fetch overflows host heap in dpdk vhost (vduse
CVE-2026-86561 6.5 MEDIUM Dpdk: dpdk: missing memory size validation before mmap in vhost memory region setup
CVE-2026-100229 6.5 MEDIUM Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad-free: out-of-bounds write in gst_h266_
CVE-2026-86849 6.5 MEDIUM Dpdk: dpdk: integer overflow combined with missing validation leads to host buffer overflo
CVE-2026-86566 6.5 MEDIUM Dpdk: dpdk: guest with runt rx descriptors underflows copy length in vhost enqueue (split
CVE-2026-86845 6.5 MEDIUM Dpdk: dpdk: guest-triggered use-after-free and type confusion in vhost-crypto session clea
CVE-2026-86846 6.5 MEDIUM Dpdk: dpdk: guest can trigger out-of-bounds write by controlling avail ring index in vhost
CVE-2026-86847 6.5 MEDIUM Dpdk: dpdk: guest can trigger infinite loop in vhost-crypto writeback chain cleanup
CVE-2026-86856 6.5 MEDIUM Dpdk: dpdk: stack and heap buffer overflow in nfp vdpa driver
CVE-2026-93683 6.4 MEDIUM Dpdk: dpdk: guest-triggered out-of-bounds walk via vhost indirect descriptor length toctou
CVE-2026-100231 6.1 MEDIUM Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad-free: heap out-of-bounds write in asfm
CVE-2026-109968 5.5 MEDIUM Clevis: clevis: pkcs#11 luks passphrase logged in plaintext to world-readable file

Showing top 20 of 25 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Red Hat Hardened Images
Same vendor: Red Hat
Same weakness: CWE-444

V. Comments for CVE-2026-88829

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