# CVE-2026-28780

## Summary

- **CVE ID:** CVE-2026-28780
- **Severity:** HIGH
- **CVSS Score:** 8.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-122
- **Published:** May 5, 2026
- **Last Modified:** Sep 17, 2026

## 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.

## Affected Products

- Apache Software Foundation — Apache HTTP Server (0)

## References

- [CNA](https://httpd.apache.org/security/vulnerabilities_24.html)
- [CVE](http://www.openwall.com/lists/oss-security/2026/05/05/9)
- [redhat-SADP](https://access.redhat.com/security/cve/CVE-2026-28780)
- [redhat-SADP](https://bugzilla.redhat.com/show_bug.cgi?id=2466913)
- [redhat-SADP](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28780.json)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:27200)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:21433)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:22140)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:21391)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:27201)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36373)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36846)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36831)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:47046)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:62165)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:66323)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:67152)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.38%
- **EPSS Percentile:** 70.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._