CVE-2026-33523

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Source
https://cve.org/CVERecord?id=CVE-2026-33523
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-33523.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-33523
Aliases
Downstream
ALPINE (1)
AZL (1)
BELL (1)
CLSA (12)
DEBIAN (1)
MGASA (1)
MINI (1)
OESA (5)
openSUSE (2)
RHSA (2)
SUSE (6)
UBUNTU (1)
Related
openSUSE (2)
SUSE (6)
Published
2026-05-04T14:40:41Z
Modified
2026-10-16T02:58:56Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N CVSS Calculator
Summary
Apache HTTP Server: multiple modules: HTTP response splitting forwarding malicious status line
Details

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.

Database specific 
{
    "cna_assigner": "apache",
    "cwe_ids": [
        "CWE-443"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33523.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "range": [
                        {
                            "introduced": "2.4.0"
                        },
                        {
                            "last_affected": "2.4.66"
                        }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/apache/httpd

Affected ranges

Type
GIT
Repo
https://github.com/apache/httpd
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last Affected
e4a77ef6051b3fe22eafacbcf54855b178a0bddd
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "last_affected": "2.4.66"
                }
            ],
            "source": "DESCRIPTION"
        }
    ]
}

Affected versions

2.*
2.4.66
2.4.66-rc1-candidate

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-33523.json"