Out-of-Bounds Read Vulnerability in Apache HTTP Server
CVE-2026-33857

5.3MEDIUM

Key Information:

Vendor

Apache
Status
Apache Http Server
Vendor
CVE Published:
4 May 2026

What is CVE-2026-33857?

An out-of-bounds read vulnerability exists in the mod_proxy_ajp module of Apache HTTP Server that could allow an attacker to access sensitive data and compromise the system's security. The affected versions, up to and including 2.4.66, are susceptible to this issue. Users are strongly encouraged to upgrade to version 2.4.67, which addresses this vulnerability and enhances the overall security of the HTTP server. Regular updates and security patches are vital for maintaining server integrity.

Affected Version(s)

Apache HTTP Server 0 <= 2.4.66

References

https://httpd.apache.org/security/vulnerabilities_24.html
vendor-advisory

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Elhanan Haenel
.