Search/CVE-2026-33523
● CVE — Medium

CVE-2026-33523

VendorapacheProducthttp serverDiscoveredMay 4, 2026UpdatedOct 26, 2026

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.

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CVSS v3.1
6.5 MEDIUM
EPSS
0.44%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
2
sources referencing this CVE
Related IOCs
0
seen in the same coverage
EPSS Trend
Aug 16, 2026 → Oct 2, 2026
● 0.00pp
0.44% → 0.44% over 3 tracked changes
CVSS v3.1 Detail
Attack VectorNETWORK
Attack ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
ScopeUNCHANGED
ConfidentialityLOW
IntegrityLOW
AvailabilityNONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Connections
4 relationships
Timeline
disclosure → media coverage
May 4, 2026
Disclosure — published as a CVE record. · last revised by NVD Oct 26, 2026
May 6, 2026
ubuntu.com reports: USN-8239-1: Apache HTTP Server vulnerabilities
Sep 10, 2026
ubuntu.com reports: USN-8571-2: Apache HTTP Server regression