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).

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

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

Configurations

Configuration 1 (hide)

AND

OR	cpe:2.3:a:ibm:http_server::::::::
	cpe:2.3:a:ibm:http_server::::::::

OR	cpe:2.3:o:ibm:aix:-:::::::*
	cpe:2.3:o:ibm:z\/os:-:::::::*
	cpe:2.3:o:linux:linux_kernel:-:::::::*
	cpe:2.3:o:microsoft:windows:-:::::::*

History

26 May 2026, 20:25

Type	Values Removed	Values Added
First Time		Ibm z\/os Linux linux Kernel Microsoft windows Ibm aix Ibm http Server Ibm Linux Microsoft
CPE		cpe:2.3:o:ibm:aix:-:::::::* cpe:2.3:a:ibm:http_server:::::::: cpe:2.3:o:microsoft:windows:-:::::::* cpe:2.3:o:ibm:z\/os:-:::::::* cpe:2.3:o:linux:linux_kernel:-:::::::*
References	~~() https://www.ibm.com/support/pages/node/7274065 -~~	() https://www.ibm.com/support/pages/node/7274065 - Vendor Advisory

26 May 2026, 18:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-26 18:16

Updated : 2026-05-26 20:25

NVD link : CVE-2026-8855

Mitre link : CVE-2026-8855

CVE.ORG link : CVE-2026-8855

JSON object : View

Products Affected

microsoft

windows

ibm

aix
z\/os
http_server

linux

linux_kernel

CWE

CWE-94

Improper Control of Generation of Code ('Code Injection')

{"id": "CVE-2026-8855", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "psirt@us.ibm.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.2}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "published": "2026-05-26T18:16:57.170", "references": [{"url": "https://www.ibm.com/support/pages/node/7274065", "tags": ["Vendor Advisory"], "source": "psirt@us.ibm.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "psirt@us.ibm.com", "description": [{"lang": "en", "value": "CWE-94"}]}], "descriptions": [{"lang": "en", "value": "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)."}], "lastModified": "2026-05-26T20:25:33.130", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:ibm:http_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D02EA5D6-7556-4C20-A991-6DC5F6B7351B", "versionEndExcluding": "8.5.5.30", "versionStartIncluding": "8.5.0.0"}, {"criteria": "cpe:2.3:a:ibm:http_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F7790D7F-B70F-4278-877B-DE501C60A9B5", "versionEndExcluding": "9.0.5.29", "versionStartIncluding": "9.0.0.0"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:ibm:aix:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "E492C463-D76E-49B7-A4D4-3B499E422D89"}, {"criteria": "cpe:2.3:o:ibm:z\\/os:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "0E97A964-6F9E-4C87-9B90-21AE2C1DF52F"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "703AF700-7A70-47E2-BC3A-7FD03B3CA9C1"}, {"criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "psirt@us.ibm.com"}