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CVE-2026-34356— Apache HTTP Server: ProxyPassReverseCookieMap buffer overflow

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 2.4.0版本至2.4.67版本存在安全漏洞，该漏洞源于恶意后端服务器和ProxyPassReverseCookie*存在基于堆的缓冲区溢出漏洞。

AI Predicted 9.1 Difficulty: Easy EPSS 1.21% · P67

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache HTTP Server 2.4.0≤ 2.4.67 affected
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I. Basic Information for CVE-2026-34356

Vulnerability Information
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Vulnerability Title
Apache HTTP Server: ProxyPassReverseCookieMap buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and ProxyPassReverseCookie* This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, 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 2.4.0版本至2.4.67版本存在安全漏洞，该漏洞源于恶意后端服务器和ProxyPassReverseCookie*存在基于堆的缓冲区溢出漏洞。
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 2.4.0 ~ 2.4.67 -

II. Public POCs for CVE-2026-34356

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III. Intelligence Information for CVE-2026-34356

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Vendor Advisories for CVE-2026-34356 (1)

Same Patch Batch · Apache Software Foundation · 2026-06-08 · 14 CVEs total

CVE-2026-47430 Cordova Plugin InAppBrowser: iOS: Arbitrary Cordova callback IDs can be dispatched without
CVE-2026-29167 Apache HTTP Server: mod_ldap per-dir use-after-free
CVE-2026-29170 Apache HTTP Server: mod_proxy_ftp XSS
CVE-2026-44186 Apache HTTP Server: Loop in `proxy_ftp_handler` in mod_proxy_ftp
CVE-2026-42535 Apache HTTP Server: mod_dav_fs protected directory access
CVE-2026-43951 Apache HTTP Server: OOB Read in `merge_response_headers` can cause crash
CVE-2026-44119 Apache HTTP Server: escalation of privilege through expressions in .htaccess in multiple m
CVE-2026-44631 Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow
CVE-2026-34355 Apache HTTP Server: mod_proxy_html buffer overflow
CVE-2026-44185 Apache HTTP Server: Stack Buffer Over-Read in mod_ssl OCSP `send_request`
CVE-2026-42536 Apache HTTP Server: mod_xml2enc heap overflow
CVE-2026-48913 Apache HTTP Server: mod_http2 memory corruption when file handles exhausted
CVE-2026-49975 Apache HTTP Server: mod_http2 denial of service

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-34356

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