CVE-2026-8834: ibm http_server Heap-based Buffer Overflow

Vulnerability summary

CVE-2026-8834 is a high (CVSS 8.0) Heap-based Buffer Overflow vulnerability in ibm http_server. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 26.4% of scored vulnerabilities.

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 contains a buffer overflow vulnerability. A privileged user, authenticated to the Administration Server, could exploit this vulnerability to execute remote code or cause a denial of service.

• CWE-122Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().