How severe is CVE-2026-8855?

CVE-2026-8855 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-8855 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-8855?

CVE-2026-8855 affects Ibm Http Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-8855?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-8855 have an EU (EUVD) identifier?

Yes. CVE-2026-8855 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31905.

When was CVE-2026-8855 published?

CVE-2026-8855 was published on 2026-05-26 and last updated on 2026-06-17.

CVE-2026-8855

CVE-2026-8855 is a high-severity vulnerability in Ibm Http Server with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31905
Weakness: CWE-94
Affected product: Ibm Http Server
Published: 2026-05-26
Last modified: 2026-06-17

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).

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 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-8855 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-8855?: CVE-2026-8855 affects Ibm Http Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-8855?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-8855 have an EU (EUVD) identifier?: Yes. CVE-2026-8855 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31905.
When was CVE-2026-8855 published?: CVE-2026-8855 was published on 2026-05-26 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:ibm:http_server:*:*:*:*:*:*:*:*

More vulnerabilities in Ibm Http Server

CVE-2012-5955 — Critical (CVSS 10.0): Unspecified vulnerability in the IBM HTTP Server component 5.3 in IBM WebSphere Application Server (WAS) for z/OS…
CVE-2010-0425 — Critical (CVSS 10.0): modules/arch/win32/mod_isapi.c in mod_isapi in the Apache HTTP Server 2.0.37 through 2.0.63, 2.2.0 through 2.2.14, and…
CVE-2004-0492 — Critical (CVSS 10.0): Heap-based buffer overflow in proxy_util.c for mod_proxy in Apache 1.3.25 to 1.3.31 allows remote attackers to cause a…
CVE-2026-9170 — Critical (CVSS 9.8): IBM HTTP Server 8.5, and 9.0 is vulnerable to denial of service and a potential remote code execution due to improper…
CVE-2015-4947 — Critical (CVSS 9.0): Stack-based buffer overflow in the Administration Server in IBM HTTP Server 6.1.0.x through 6.1.0.47, 7.0.0.x before…
CVE-2026-8834 — High (CVSS 8.0): IBM HTTP Server 8.5, and 9.0 contains a buffer overflow vulnerability. A privileged user, authenticated to the…

All CVEs affecting Ibm Http Server →

Other CWE-94 (Code Injection) vulnerabilities

CVE-2026-57624 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Blocksy Companion Pro <= 2.1.46 versions.
CVE-2026-10134 — Critical (CVSS 10.0): IBM Langflow OSS 1.0.0 through 1.9.3 allows an attacker to read every secret available to the Langflow process, read…
CVE-2026-53576 — Critical (CVSS 10.0): Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, the authentication filter…
CVE-2026-10561 — Critical (CVSS 10.0): IBM Langflow OSS 1.0.0 through 1.9.3 has an vulnerability due to an improper isolation of Python execution combined…
CVE-2026-25470 — Critical (CVSS 10.0): Improper Control of Generation of Code ('Code Injection') vulnerability in ACPT ACPT (Pro) - Custom Post Types Plugin…
CVE-2026-48836 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Easy Invoice <= 2.1.19 versions.

Browse all CWE-94 (Code Injection) vulnerabilities →