What is CVE-2026-88837?

CVE-2026-88837 is a medium-severity vulnerability, classified under Authentication Bypass by Primary Weakness. CVSS score: 6.5/10. Published 2026-09-23.

How severe is CVE-2026-88837?

Medium severity. CVSS v3 base score is 6.5 out of 10.

CVE-2026-88837

CVE-2026-88837

BusyBox httpd treats yescrypt ($y$) password hashes as plaintext during Basic Authentication, inverting the authentication check.

Published 2026-09-23 · last modified 2026-09-25.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (19.8th percentile), scored 2026-11-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Weakness classification (CWE)

CWE-305 — Authentication Bypass by Primary Weakness

References

access.redhat.com/security/cve/CVE-2026-88837 (vdb-entry)
RHBZ#2531351 (issue-tracking)
RHSA-2026:72111 (vendor-advisory)

Frequently asked questions

What is CVE-2026-88837?: CVE-2026-88837 is a medium-severity vulnerability, classified under Authentication Bypass by Primary Weakness. CVSS score: 6.5/10. Published 2026-09-23.
How severe is CVE-2026-88837?: Medium severity. CVSS v3 base score is 6.5 out of 10.