What’s Vulnerable › Vulnerabilities

CVE-2026-49975: Apache HTTP Server: mod_http2 denial of service

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 33.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-08 · updated 2026-08-19
• Weakness: CWE-789

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.

Affected products

• Apache HTTP Server: from 2.4.17 before 2.4.68 — fixed in 2.4.68
• Debian Linux: 11.0

How to fix

Upgrade to a fixed version: Apache HTTP Server 2.4.68. Check the vendor advisory for mitigations.

In the news

• HTTP/2 Bomb CVE-2026-49975

References

• https://httpd.apache.org/security/vulnerabilities_24.html
• http://www.openwall.com/lists/oss-security/2026/06/03/3
• http://www.openwall.com/lists/oss-security/2026/06/08/16
• https://lists.debian.org/debian-lts-announce/2026/06/msg00009.html
• https://access.redhat.com/errata/RHSA-2026:25042
• https://access.redhat.com/errata/RHSA-2026:25057
• https://access.redhat.com/errata/RHSA-2026:25090
• https://access.redhat.com/errata/RHSA-2026:25225
• https://access.redhat.com/errata/RHSA-2026:27114
• https://access.redhat.com/errata/RHSA-2026:27200
• https://access.redhat.com/errata/RHSA-2026:27201
• https://access.redhat.com/errata/RHSA-2026:36373

Get alerted when CVE-2026-49975 or the next vulnerability affects your stack