Medium severity · published May 4, 2026
CVE-2026-34032
Apache HTTP Server: mod_proxy_ajp: Heap Buffer Over-Read Due to Missing Null-Termination Check (ajp_msg_get_string)
5.3
CVSS
0.5%
EPSS
No
On KEV
Description
Improper Null Termination, Out-of-bounds Read vulnerability in Apache HTTP Server.
This issue affects Apache HTTP Server: through 2.4.66.
Users are recommended to upgrade to version 2.4.67, which fixes the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HS
HTTP Server · Apache
through 2.4.66 · source: vendor, NVD
In the news
VulnerabilityLow
ZDI-26-356: Apache HTTP Server mod_proxy_ajp Out-Of-Bounds Read Information Disclosure Vulnerability
This vulnerability allows remote attackers to disclose sensitive information on affected installations of Apache HTTP Server. An attacker must first obtain the ability to compromise an AJP backend associated with the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 3.7. The following CVEs are assigned: CVE-2026-34032.
Jun 11, 2026·Zero Day Initiative
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34032
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-34032
Vendor Advisory
https://httpd.apache.org/security/vulnerabilities_24.html
Mailing List
http://www.openwall.com/lists/oss-security/2026/05/04/16
More from HTTP Server
9.8
CVE-2021-42013
Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)
9.8
CVE-2021-41773
Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49
9.1
CVE-2024-38475
Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.
9.0
CVE-2021-40438
mod_proxy SSRF
7.8
CVE-2019-0211
Apache HTTP Server Privilege Escalation Vulnerability