Critical severity · published May 26, 2026
CVE-2026-8856
IBM HTTP Server is affected by multiple vulnerabilities
9.1
CVSS
0.2%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HS
HTTP Server · IBM
8.5.0 through Interim Fix 002; 9.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-8856
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-8856
Vendor Advisory
https://www.ibm.com/support/pages/node/7274065
More from HTTP Server
9.8
CVE-2026-9170
IBM HTTP Server is affected by multiple vulnerabilities
9.8
CVE-2026-8855
IBM HTTP Server is affected by multiple vulnerabilities
8.0
CVE-2026-8834
IBM HTTP Server is affected by multiple vulnerabilities
7.5
CVE-2026-8854
IBM HTTP Server is affected by multiple vulnerabilities
7.5
CVE-2026-8852
IBM HTTP Server is affected by multiple vulnerabilities