CVE-2026-33523 — MEDIUM (6.5)

Q: How severe is CVE-2026-33523?

CVE-2026-33523 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-33523?

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

Vulnerability Description

HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised backend servers. This issue affects Apache HTTP Server: from through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

CVSS Score

6.5

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Apache	Http Server	>= 2.4.0, < 2.4.67

Related Weaknesses (CWE)

CWE-443

References

https://httpd.apache.org/security/vulnerabilities_24.htmlVendor Advisory
http://www.openwall.com/lists/oss-security/2026/05/04/23Mailing ListThird Party Advisory

FAQ

What is CVE-2026-33523?

CVE-2026-33523 is a vulnerability with a CVSS score of 6.5 (MEDIUM). HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised backend servers. This issue affects Apache HTTP Server: from through 2.4.66. Users are reco...

How severe is CVE-2026-33523?

CVE-2026-33523 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-33523?

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