What is CVE-2026-88830?

CVE-2026-88830 is a high-severity vulnerability in Red Hat Hardened Images, classified under Incorrect Calculation of Buffer Size. CVSS score: 7.5/10. Published 2026-09-23.

How severe is CVE-2026-88830?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Red Hat Hardened Images

CVE-2026-88830

A unit confusion in BusyBox TLS Montgomery reduction buffer allocation causes a pre-authentication heap buffer overflow when processing a crafted ClientKeyExchange message.

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

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (28.8th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Red Hat Hardened Images

Weakness classification (CWE)

CWE-131 — Incorrect Calculation of Buffer Size

References

access.redhat.com/security/cve/CVE-2026-88830 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)

Frequently asked questions

What is CVE-2026-88830?: CVE-2026-88830 is a high-severity vulnerability in Red Hat Hardened Images, classified under Incorrect Calculation of Buffer Size. CVSS score: 7.5/10. Published 2026-09-23.
How severe is CVE-2026-88830?: High severity. CVSS v3 base score is 7.5 out of 10.