What is CVE-2026-8852?

CVE-2026-8852 is a medium-severity vulnerability in IBM Aix, classified under Reachable Assertion. CVSS score: 6.2/10. Published 2026-05-26.

How severe is CVE-2026-8852?

Medium severity. CVSS v3 base score is 6.2 out of 10.

Vulnerability in IBM Aix

CVE-2026-8852

IBM HTTP Server 8.5, and 9.0 is vulnerable to denial of service via the optional module mod_fastcgi module.

Published 2026-05-26 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (25.0th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

www.ibm.com/support/pages/node/7274065 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-8852?: CVE-2026-8852 is a medium-severity vulnerability in IBM Aix, classified under Reachable Assertion. CVSS score: 6.2/10. Published 2026-05-26.
How severe is CVE-2026-8852?: Medium severity. CVSS v3 base score is 6.2 out of 10.