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CVE-2026-88834— Busybox: busybox: httpd user existence oracle in non-default shadow-disabled builds

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 的 httpd 网络服务器中发现了一个漏洞。当配置了系统密码认证时，在某些构建配置中可能存在用户存在性预言（user existence oracle）。攻击者可以通过观察认证失败行为来区分有效用户名和无效用户名。该漏洞的影响仅限于用户名枚举，并且需要非默认的编译选项或不常见的密码文件状态才会触发；支持 shadow 密码的默认 BusyBox 构建不受此影响。

CVSS 3.7 · Low EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1087.004 · Cloud Account

Affected Version Matrix 1

VendorProduct Version RangeStatus
Red Hat Red Hat Hardened Images any affected
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I. Basic Information for CVE-2026-88834

Vulnerability Information
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Vulnerability Title
Busybox: busybox: httpd user existence oracle in non-default shadow-disabled builds
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in BusyBox's httpd web server. When configured with system password authentication, a user existence oracle may exist in certain build configurations. An attacker could distinguish existing from non-existing usernames by observing authentication failure behavior. Impact is limited to username enumeration and requires non-default compile options or uncommon password file states; default BusyBox builds with shadow password support are not affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过差异性导致的信息暴露
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-2026-88834

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III. Intelligence Information for CVE-2026-88834

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Vendor Advisories for CVE-2026-88834 (2)

Same Patch Batch · Red Hat · 2026-10-13 · 9 CVEs total

CVE-2026-109832 7.5 HIGH Gnome-remote-desktop: busy-wait dos in vnc tls i/o handlers (gnutls_e_again / gnutls_e_int
CVE-2026-88833 6.5 MEDIUM Busybox: busybox: udhcpc integer underflow in dhcp packet length calculation causes denial
CVE-2026-109833 5.9 MEDIUM Gnome-remote-desktop: heap buffer overflow in gnome-remote-desktop vnc tls peek buffer han
CVE-2026-105460 5.5 MEDIUM Bluez: bluez: stack-based out-of-bounds read in btmon via unvalidated num_keys in return_l
CVE-2026-88838 5.5 MEDIUM Busybox: busybox: non-root mount option filter bypass allows clearing fstab security restr
CVE-2026-109976 4.7 MEDIUM Clevis: clevis: integer underflow in pkcs#11 data socket handler crashes daemon on unbound
CVE-2026-110036 3.3 LOW Device-mapper-persistent-data: device-mapper-persistent-data: denial of service via crafte
CVE-2026-109854 2.5 LOW M17n-lib: uninitialized stack read in iso-2022 compound text utf-8 decoding

IV. Related Vulnerabilities

Same product: Red Hat Hardened Images
Same vendor: Red Hat
Same weakness: CWE-203

V. Comments for CVE-2026-88834

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