CVE-2026-8855

Name: CVE-2026-8855
Creator: NVD / NIST
Published: 2026-05-26T18:16:57.17+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.46%

Last modified Jun 17, 2026

CVE-2026-8855 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. IBM HTTP Server 8.5, and 9.0 is vulnerable to remote code execution and denial of service in configurations with TLS mutual authentication (client authentication).. EPSS estimates a 0.46% chance of exploitation in the next 30 days.

Description

IBM HTTP Server 8.5, and 9.0 is vulnerable to remote code execution and denial of service in configurations with TLS mutual authentication (client authentication).

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

0.46%

36.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-94

Affected Software

Vendor	Product	Versions
Ibm	Http Server	>= 8.5.0.0, < 8.5.5.30
Ibm	Http Server	>= 9.0.0.0, < 9.0.5.29

References

https://www.ibm.com/support/pages/node/7274065Vendor Advisory

Timeline

Published: May 26, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-8855?

IBM HTTP Server 8.5, and 9.0 is vulnerable to remote code execution and denial of service in configurations with TLS mutual authentication (client authentication).

How severe is CVE-2026-8855?

CVE-2026-8855 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.46% probability of exploitation in the next 30 days.

How do I fix CVE-2026-8855?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-8855?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST