CVE-2026-8855

critical

Published 2026-05-26 · Modified 2026-05-26

CVSS v3

9.8

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

CVSS v2

—

VIR risk

9.8

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).

Predictions

Exploit likelihood

97%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: psirt@us.ibm.com — https://www.ibm.com/support/pages/node/7274065

OS impact

OS	Version	Status	Fixed in
linux-kernel	-	not-affected

Application impact

Vendor	Product	Versions	Fixed
ibm	http_server	`{"startIncluding":"8.5.0.0","endExcluding":"8.5.5.30"}`	`8.5.5.30`

References

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

CWEs

CWE-94

Verify integrity in audit chain (admin only). AS-IS.