How severe is CVE-2026-8856?

CVE-2026-8856 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2026-8856 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-8856?

CVE-2026-8856 affects Ibm Http Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-8856?

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-2026-8856 have an EU (EUVD) identifier?

Yes. CVE-2026-8856 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31903.

When was CVE-2026-8856 published?

CVE-2026-8856 was published on 2026-05-26 and last updated on 2026-06-17.

CVE-2026-8856

CVE-2026-8856 is a high-severity vulnerability in Ibm Http Server with a CVSS 3.x base score of 7.7. 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-400.

Key facts

Severity: High (CVSS 3.x base score 7.7)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31903
Weakness: CWE-400
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 denial of service in configurations where an attacker has write access to parts of the server configuration.

Frequently asked questions

What is CVE-2026-8856?: 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.
How severe is CVE-2026-8856?: CVE-2026-8856 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2026-8856 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-8856?: CVE-2026-8856 affects Ibm Http Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-8856?: 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-2026-8856 have an EU (EUVD) identifier?: Yes. CVE-2026-8856 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31903.
When was CVE-2026-8856 published?: CVE-2026-8856 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:*:*:*:*:*:*:*:*

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