Apache HTTP Server: mod_http2 denial of service
Summary
| CVE | CVE-2026-49975 |
|---|---|
| State | PUBLISHED |
| Assigner | apache |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-08 16:16:44 UTC |
| Updated | 2026-06-08 18:16:33 UTC |
| 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. |
Risk And Classification
Problem Types: CWE-789 | CWE-789 CWE-789 Memory Allocation with Excessive Size Value
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Apache Software Foundation | Apache HTTP Server | affected 2.4.17 2.4.67 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| httpd.apache.org/security/vulnerabilities_24.html | [email protected] | httpd.apache.org | |
| lists.debian.org/debian-lts-announce/2026/06/msg00009.html | af854a3a-2127-422b-91ae-364da2661108 | lists.debian.org | |
| www.openwall.com/lists/oss-security/2026/06/03/3 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Quang Luong of Calif.IO in collaboration with OpenAI Codex (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-05-26T12:00:00.000Z | reported |
| CNA | 2026-05-27T12:00:00.000Z | fixed upstream in mod_h2 https://github.com/icing/mod_h2/commit/35c6e405390ed361189a82acd96675401ea5947c |
| CNA | 2026-06-02T12:00:00.000Z | fixed in 2.4.x by r1934882 |
| CNA | 2026-06-08T12:00:00.000Z | 2.4.68 released |
There are currently no legacy QID mappings associated with this CVE.