Is CVE-2026-8856 actively exploited?

No active exploitation of CVE-2026-8856 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-8856 be exploited remotely?

Yes. CVE-2026-8856 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-8856?

CVE-2026-8856 has a CVSS score of 9.1 (CRITICAL).

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CRITICAL

CVE-2026-8856

CWE-400Published: May 26, 2026· Updated: May 26, 2026

9.1

CVSS v3.1

Official 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.

NVD Source

Risk Analysis

This critical vulnerability in IBM HTTP Server versions 8.5 and 9.0 can lead to a denial of service. If an attacker has write access to parts of the server configuration, they can exploit this flaw to disrupt service availability. The CVSS score of 9.1 indicates a high impact on availability.

No public exploit is currently known for this vulnerability. The flaw is remotely exploitable due to its network attack vector and low attack complexity.

Recommended Action

Upgrade IBM HTTP Server to a patched version beyond 8.5 and 9.0. Restrict write access to server configuration files to authorized personnel only.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-8856 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.1.