CVE-2026-29168
published 2026-05-05CVE-2026-29168: Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's mod_md via OCSP response data. This issue affects Apache HTTP…
PriorityP345high7.3CVSS 3.1
AVNACLPRNUINSUCLILAL
EPSS
0.63%
46.1th percentile
Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's mod_md via OCSP response data.
This issue affects Apache HTTP Server: from 2.4.30 through 2.4.66.
Users are recommended to upgrade to version 2.4.67, which fixes the issue.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| apache | http_server | >= 2.4.30 < 2.4.67 | 2.4.67 |
| apache_software_foundation | apache_http_server | 2.4.30 – 2.4.66 | — |
| httpd_2.4 | mod_md | — | — |
| ubuntu | apache2 | — | — |
CVSS provenance
nvdv3.17.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
vendor_ubuntu8.8HIGH
vendor_redhat7.3HIGH
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Ubuntu
Apache HTTP Server vulnerabilities
vendor_ubuntu·2026-05-06·CVSS 8.8
CVE-2026-28780 [HIGH] Apache HTTP Server vulnerabilities
Title: Apache HTTP Server vulnerabilities
Summary: Several security issues were fixed in Apache HTTP Server.
Bartlomiej Dmitruk and Stanislaw Strzalkowski discovered that Apache
HTTP Server incorrectly handled certain memory operations when using the
HTTP/2 protocol. A remote attacker could use this issue to cause Apache
HTTP Server to crash, resulting in a denial of service, or possibly execute
arbitrary code. This issue only affected Ubuntu 26.04 LTS.
(CVE-2026-23918)
It was discovered that the Apache HTTP Server mod_rewrite module
incorrectly handled certain privileges. A local attacker could possibly use
this issue to obtain sensitive information. (CVE-2026-24072)
Andrew Lacambra, Elhanan Haenel, Tianshuo Han, and Tristan Madani
discovered that the Apache HTTP Server mod_proxy_ajp
Red Hat
httpd: mod_md: unrestricted OCSP response leads to resource exhaustion
vendor_redhat·2026-05-05·CVSS 7.3
CVE-2026-29168 [HIGH] CWE-770 httpd: mod_md: unrestricted OCSP response leads to resource exhaustion
httpd: mod_md: unrestricted OCSP response leads to resource exhaustion
A flaw was found in the mod_md module of httpd. When processing OCSP (Online Certificate Status Protocol) responses from a malicious or compromised OCSP responder, the module fails to enforce proper size limits on the incoming data. This issue leads to memory exhaustion and a denial of service.
Statement: To exploit this flaw, the Apache HTTP Server must query an untrusted or compromised OCSP responder, limiting its exposure. Due to this reason, this vulnerability has been rated with a moderate severity.
This flaw only affects configurations with mod_md loaded and being used. This module can be disabled via the configuration file if its functionality is not being used.
Mitigation: Disabling mod_md and restarting http
VulDB
Apache HTTP Server up to 2.4.66 mod_md allocation of resources
vuldb·2026-05-05·CVSS 7.3
CVE-2026-29168 [HIGH] Apache HTTP Server up to 2.4.66 mod_md allocation of resources
A vulnerability marked as critical has been reported in Apache HTTP Server up to 2.4.66. The affected element is an unknown function of the component mod_md. The manipulation leads to allocation of resources.
This vulnerability is traded as CVE-2026-29168. It is possible to initiate the attack remotely. There is no exploit available.
It is suggested to upgrade the affected component.
GHSA
GHSA-h688-wmf2-q99q: Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's mod_md via OCSP response data
ghsa_unreviewed·2026-05-05
CVE-2026-29168 [HIGH] CWE-770 GHSA-h688-wmf2-q99q: Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's mod_md via OCSP response data
Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's mod_md via OCSP response data.
This issue affects Apache HTTP Server: from 2.4.30 through 2.4.66.
Users are recommended to upgrade to version 2.4.67, which fixes the issue.
No detection rules found.
No public exploits indexed.
Rapid7
Patch Tuesday - May 2026
blogs_rapid7·2026-05-13·CVSS 10.0
CVE-2026-41089 [CRITICAL] Patch Tuesday - May 2026
Microsoft is publishing 137 vulnerabilities on May 2026 Patch Tuesday . Microsoft is not aware of exploitation in the wild or public disclosure for any of these vulnerabilities. So far this month, Microsoft has provided patches to address 133 browser vulnerabilities, which are not included in the Patch Tuesday count above.
## Windows Netlogon: critical RCE
Anyone responsible for securing a domain controller should prioritize remediation of CVE-2026-41089 , which is a critical stack-based buffer overflow in Windows Netlogon with a CVSS v3 base score of 9.8. Exploitation leads to execution in the context of the Netlogon service, so that’s SYSTEM privileges on the domain controller. For most pentesters, that’s the point at which the customer report more or less writes itself. No privileges
Bugzilla
CVE-2026-29168 mod_md: unrestricted OCSP response leads to resource exhaustion [fedora-all]
bugzilla·2026-05-12·CVSS 7.3
CVE-2026-29168 [HIGH] CVE-2026-29168 mod_md: unrestricted OCSP response leads to resource exhaustion [fedora-all]
CVE-2026-29168 mod_md: unrestricted OCSP response leads to resource exhaustion [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-29168 httpd: mod_md: unrestricted OCSP response leads to resource exhaustion
bugzilla·2026-05-05·CVSS 7.3
CVE-2026-29168 [HIGH] CVE-2026-29168 httpd: mod_md: unrestricted OCSP response leads to resource exhaustion
CVE-2026-29168 httpd: mod_md: unrestricted OCSP response leads to resource exhaustion
Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's mod_md via OCSP response data.
This issue affects Apache HTTP Server: from 2.4.30 through 2.4.66.
Users are recommended to upgrade to version 2.4.67, which fixes the issue.
2026-05-05
Published