CVE-2026-28780
Critical
Description
Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Apache Http Server
PublishedMay 5, 2026
First seenMay 5, 2026
Weakness typeCWE-122CWE-122
How to fix
Update
- apache http_server2.4.67 or later
Vendor advisories
- httpd.apache.org/security/vulnerabilities_24.html
- access.redhat.com/errata/RHSA-2026:27200
- access.redhat.com/errata/RHSA-2026:47046
- access.redhat.com/errata/RHSA-2026:21433
- access.redhat.com/errata/RHSA-2026:22140
- access.redhat.com/errata/RHSA-2026:36846
- access.redhat.com/errata/RHSA-2026:36831
- access.redhat.com/errata/RHSA-2026:36373
- access.redhat.com/errata/RHSA-2026:67152
- access.redhat.com/errata/RHSA-2026:66323
- access.redhat.com/errata/RHSA-2026:62165
- access.redhat.com/errata/RHSA-2026:21391
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| apache http_server | v < 2.4.67 | 2.4.67 |
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