Apache HTTP Server mod_http DoS via Excessive Memory Allocation (2.4.17-2.4.67)
CVE-2026-49975 Published on June 8, 2026
Apache HTTP Server: mod_http2 denial of service
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.
Timeline
reported
fixed upstream in mod_h2 https://github.com/icing/mod_h2/commit/35c6e405390ed361189a82acd96675401ea5947c 1 day later.
fixed in 2.4.x by r1934882 6 days later.
2.4.68 released 6 days later.
Weakness Type
What is a Stack Exhaustion Vulnerability?
The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.
CVE-2026-49975 has been classified to as a Stack Exhaustion vulnerability or weakness.
Products Associated with CVE-2026-49975
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Affected Versions
Apache Software Foundation Apache HTTP Server:- Version 2.4.17, <= 2.4.67 is affected.