CVE-2026-34356 — HIGH (7.5)

Q: How severe is CVE-2026-34356?

CVE-2026-34356 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-34356?

Check the references section above for vendor advisories and patch information. Affected products include: Apache Http Server.

Vulnerability Description

Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and ProxyPassReverseCookie* This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue.

CVSS Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Apache	Http Server	>= 2.4.0, < 2.4.68

Related Weaknesses (CWE)

CWE-122

References

https://httpd.apache.org/security/vulnerabilities_24.htmlVendor Advisory
http://www.openwall.com/lists/oss-security/2026/06/08/7Mailing List

FAQ

What is CVE-2026-34356?

CVE-2026-34356 is a vulnerability with a CVSS score of 7.5 (HIGH). Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and ProxyPassReverseCookie* This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. Users are ...

How severe is CVE-2026-34356?

CVE-2026-34356 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-34356?

Check the references section above for vendor advisories and patch information. Affected products include: Apache Http Server.