CVE-2026-34356: CWE-122 Heap-based Buffer Overflow in Apache Software Foundation Apache HTTP Server
A heap-based buffer overflow vulnerability exists in Apache HTTP Server versions from 2.4.0 through 2.4.67, related to interactions with malicious backend servers and the ProxyPassReverseCookie* directive. This vulnerability can cause a denial of service due to server crashes. The issue is fixed in Apache HTTP Server version 2.4.68.
AI Analysis
Technical Summary
CVE-2026-34356 is a heap-based buffer overflow vulnerability in Apache HTTP Server affecting versions 2.4.0 through 2.4.67. The flaw involves the handling of responses from malicious backend servers when using the ProxyPassReverseCookie* directive, potentially leading to memory corruption. This vulnerability has a CVSS 3.1 base score of 7.5, indicating high severity with network attack vector, low attack complexity, no privileges required, no user interaction, and impact limited to availability (denial of service).
Potential Impact
Successful exploitation can cause a denial of service by crashing the Apache HTTP Server, impacting availability. There is no indication of confidentiality or integrity impact. No known exploits in the wild have been reported.
Mitigation Recommendations
Users should upgrade Apache HTTP Server to version 2.4.68 or later, where this vulnerability is fixed. Patch status is confirmed by the vendor's advisory recommending this upgrade. No alternative mitigations or temporary fixes are indicated.
CVE-2026-34356: CWE-122 Heap-based Buffer Overflow in Apache Software Foundation Apache HTTP Server
Description
A heap-based buffer overflow vulnerability exists in Apache HTTP Server versions from 2.4.0 through 2.4.67, related to interactions with malicious backend servers and the ProxyPassReverseCookie* directive. This vulnerability can cause a denial of service due to server crashes. The issue is fixed in Apache HTTP Server version 2.4.68.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-34356 is a heap-based buffer overflow vulnerability in Apache HTTP Server affecting versions 2.4.0 through 2.4.67. The flaw involves the handling of responses from malicious backend servers when using the ProxyPassReverseCookie* directive, potentially leading to memory corruption. This vulnerability has a CVSS 3.1 base score of 7.5, indicating high severity with network attack vector, low attack complexity, no privileges required, no user interaction, and impact limited to availability (denial of service).
Potential Impact
Successful exploitation can cause a denial of service by crashing the Apache HTTP Server, impacting availability. There is no indication of confidentiality or integrity impact. No known exploits in the wild have been reported.
Mitigation Recommendations
Users should upgrade Apache HTTP Server to version 2.4.68 or later, where this vulnerability is fixed. Patch status is confirmed by the vendor's advisory recommending this upgrade. No alternative mitigations or temporary fixes are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-03-27T11:47:04.086Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a26e463e29bf47b501e0db2
Added to database: 06/08/2026, 15:48:51 UTC
Last enriched: 06/24/2026, 17:18:09 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 122
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