CVE-2026-88837

Busybox: busybox: httpd misidentifies yescrypt password hashes as plaintext, inverting authentication

Published Sep 23, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Description
BusyBox httpd treats yescrypt ($y$) password hashes as plaintext during Basic Authentication, inverting the authentication check.

Remediation

Vendor Workaround

Do not use BusyBox httpd for password-protected resources. If it must be used, configure authentication with SHA-512 ($6$) hashes, which are correctly detected. Upstream should update the hash detection logic to recognize the $y$ prefix.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Busybox
Busybox busybox
Redhat hardened Images
Vendors & Products Busybox
Busybox busybox
Redhat hardened Images
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description BusyBox httpd treats yescrypt ($y$) password hashes as plaintext during Basic Authentication, inverting the authentication check.
Title Busybox: busybox: httpd misidentifies yescrypt password hashes as plaintext, inverting authentication
First Time appeared Redhat
Redhat hummingbird
Weaknesses CWE-305
CPEs cpe:/a:redhat:hummingbird:1
Vendors & Products Redhat
Redhat hummingbird
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Sep 25, 2026, 10:28 PM
Reserved
Sep 10, 2026, 9:42 AM
Status
Awaiting Analysis
Published
Sep 23, 2026, 6:17 PM
Modified
Sep 25, 2026, 11:16 PM
Severity
Moderate
Public date
Sep 23, 2026, 4:35 PM