9.8

CVE-2026-8855: ibm http_server Code Injection

CVSS: 9.8v3.1CriticalAnalyzed
Published 26-05-2026Last modified 28-05-2026
Open JSON

Vulnerability summary

CVE-2026-8855 is a critical (CVSS 9.8) Code Injection vulnerability in ibm http_server. EPSS estimates a 0.85% chance of exploitation in the next 30 days, higher than 57.4% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
0.85%
0%100%
Low · +0.39 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 26-05-2026
    PublishedVulnerability first disclosed.
  2. 28-05-2026
    Last modifiedVulnerability information updated.

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).

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.85%

Chance of exploitation in the next 30 days

Percentile

57%

Versus all other CVEs

30-day change

+0.39 pp

From 0.46% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.85%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ibm1 product
  • http_server≥ 8.5.0, ≤ Interim Fix 002 | 9.0 | ≥ 8.5.0.0, < 8.5.5.30 | ≥ 9.0.0.0, < 9.0.5.29

1 vendor · 1 product

References

1 links