CVE-2026-8856

HIGH
Published May 26, 2026 Modified May 26, 2026 CWE-400

Description

IBM HTTP Server 8.5, and 9.0 is vulnerable to denial of service in configurations where an attacker has write access to parts of the server configuration.

CVSS v3.1 Score

7.7
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

EPSS — Exploit Prediction

0.0003
Probability of exploitation
0.09%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor Product
ibm http_server
ibm http_server
ibm aix
ibm z\/os
linux linux_kernel
microsoft windows

References

Frequently Asked Questions

What is CVE-2026-8856? +
IBM HTTP Server 8.5, and 9.0 is vulnerable to denial of service in configurations where an attacker has write access to parts of the server configuration. It has a CVSS v3.1 base score of 7.7 (HIGH).
How severe is CVE-2026-8856? +
CVE-2026-8856 has a CVSS v3.1 score of 7.7 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0003, placing it in the 0th percentile for exploitation probability.
What products are affected by CVE-2026-8856? +
CVE-2026-8856 affects products from ibm, linux, microsoft, specifically: aix, http_server, linux_kernel, windows, z\/os. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2026-8856? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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