CVE-2026-49975
Apache HTTP Server: mod_http2 denial of service
- State
- Published
- Severity
- 7.5 High
- Published
- Jun 8, 2026
- Updated
- Aug 19, 2026
- Reserved
- Jun 2, 2026
Description
Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of service via malicious HTTP requests.
This issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CISA-ADP |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
Apache HTTP ServerApache Software Foundation |
|
References
- https://httpd.apache.org/security/vulnerabilities_24.htmlvendor-advisory
- http://www.openwall.com/lists/oss-security/2026/06/03/3
- https://lists.debian.org/debian-lts-announce/2026/06/msg00009.html
- http://www.openwall.com/lists/oss-security/2026/06/08/16
- https://github.com/EQSTLab/CVE-2026-49975exploit
- https://access.redhat.com/security/cve/CVE-2026-49975vdb-entry
- RHBZ#2485371issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49975.json
- https://access.redhat.com/errata/RHSA-2026:27200vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:50538vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:25225vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:25090vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36846vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36831vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36373vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:55930vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:55992vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:50572vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:25057vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:25042vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:27201vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:27114vendor-advisory
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