CVE-2026-28780
Heap-based Buffer Overflow in Apache HTTP Server mod_proxy_ajp
Publication date: 2026-05-05
Last updated on: 2026-05-06
Assigner: Apache Software Foundation
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| apache | http_server | to 2.4.67 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-122 | A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a heap-based buffer overflow in the mod_proxy_ajp module of the Apache HTTP Server. It occurs when mod_proxy_ajp connects to a malicious AJP server that sends a specially crafted AJP message. This message causes mod_proxy_ajp to write 4 attacker-controlled bytes beyond the end of a heap buffer, potentially leading to memory corruption.
How can this vulnerability impact me? :
The impact of this vulnerability is that an attacker controlling a malicious AJP server can exploit the buffer overflow to corrupt memory in the Apache HTTP Server process. This could lead to unpredictable behavior such as crashes, denial of service, or potentially arbitrary code execution depending on the environment and exploitation conditions.
What immediate steps should I take to mitigate this vulnerability?
Users are recommended to upgrade Apache HTTP Server to version 2.4.67, which fixes the heap-based buffer overflow vulnerability in mod_proxy_ajp.