Vulnerability · Published Sep 23, 2026 · Assigned by redhat
CVE-2026-88837Busybox: busybox: httpd misidentifies yescrypt password hashes as plaintext, inverting authentication
Medium 6.5
In plain English
A medium-severity security flaw in Red Hat Hardened Images from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 80.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
BusyBox httpd treats yescrypt ($y$) password hashes as plaintext during Basic Authentication, inverting the authentication check.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | busybox | no fix listed | DEBIAN-CVE-2026-88837 |
| Debian:13 | busybox | no fix listed | DEBIAN-CVE-2026-88837 |
| Debian:14 | busybox | no fix listed | DEBIAN-CVE-2026-88837 |
| Ubuntu:22.04:LTS | busybox | no fix listed | UBUNTU-CVE-2026-88837 |
| Ubuntu:24.04:LTS | busybox | no fix listed | UBUNTU-CVE-2026-88837 |
| Ubuntu:26.04:LTS | busybox | no fix listed | UBUNTU-CVE-2026-88837 |
| Ubuntu:26.10 | busybox | no fix listed | UBUNTU-CVE-2026-88837 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Hardened Images | see references |
Weakness: CWE-305 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
References
- RHSA-2026:72111 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-88837 vdb-entry, x_refsource_REDHAT
- RHBZ#2531351 issue-tracking, x_refsource_REDHAT