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CVE-2026-28780— Apache HTTP Server: buffer overflow in mod_proxy_ajp via ajp_msg_check_header()

Quick assessment

Affected
Apache Software Foundation Apache HTTP Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache HTTP Server是美国阿帕奇（Apache）基金会的一款开源网页服务器。该服务器具有快速、可靠且可通过简单的API进行扩充的特点。 Apache HTTP Server 2.4.66及之前版本存在安全漏洞，该漏洞源于mod_proxy_ajp存在基于堆的缓冲区溢出，当连接到恶意AJP服务器时，该服务器可以发送恶意AJP消息导致在堆缓冲区末尾写入4个攻击者控制的字节。

AI Predicted 8.1 Difficulty: Hard EPSS 1.63% · P75

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache HTTP Server ≤ 2.4.66 affected
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I. Basic Information for CVE-2026-28780

Vulnerability Information
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Vulnerability Title
Apache HTTP Server: buffer overflow in mod_proxy_ajp via ajp_msg_check_header()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Apache HTTP Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache HTTP Server是美国阿帕奇（Apache）基金会的一款开源网页服务器。该服务器具有快速、可靠且可通过简单的API进行扩充的特点。 Apache HTTP Server 2.4.66及之前版本存在安全漏洞，该漏洞源于mod_proxy_ajp存在基于堆的缓冲区溢出，当连接到恶意AJP服务器时，该服务器可以发送恶意AJP消息导致在堆缓冲区末尾写入4个攻击者控制的字节。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache HTTP Server 0 ~ 2.4.66 -

II. Public POCs for CVE-2026-28780

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III. Intelligence Information for CVE-2026-28780

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Vendor Advisories for CVE-2026-28780 (1)

Same Patch Batch · Apache Software Foundation · 2026-05-05 · 5 CVEs total

CVE-2026-29168 Apache HTTP Server: mod_md unrestricted OCSP response
CVE-2026-43868 Apache Thrift: Rust implementation vulnerable to CVE-2020-13949 pattern
CVE-2026-43870 Apache Thrift: Node.js web_server.js multi-vulnerability
CVE-2026-43869 Apache Thrift: TSSLTransportFactory.java hostname verification

IV. Related Vulnerabilities

Same product: Apache HTTP Server
Same vendor: Apache Software Foundation
Same weakness: CWE-122

V. Comments for CVE-2026-28780

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