CVE-2026-33857: exploitation status and patch state

CVE-2026-33857 · CVSS 5.3 MEDIUM · patch available

Out-of-bounds Read vulnerability in mod_proxy_ajp of Apache HTTP Server. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Is CVE-2026-33857 exploited?

• Not in the CISA KEV catalog.
• Public exploit code: none found in monitored sources.

Which products and versions are affected?

No affected package list recorded here yet.

Is there a patch?

• CBL-Mariner Releases

What PlainSec published about CVE-2026-33857

• Apache Patch Hides Module-Specific Exposure Across Hosts (2026-05-07)
• Apache Protocol Parsers Expose Servers to RCE and DoS (2026-05-05)

Primary sources

• NVD record

What this record does not say

• No EPSS score.
• No affected package data.

KEV and EPSS are re-checked daily. Record last updated 2026-08-11.