Memory Allocation with Excessive Size Value Affecting apache/httpd package, versions [2.4.17,2.4.68)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-APACHEHTTPD-17309031
- published11 Jun 2026
- disclosed3 Jun 2026
- creditQuang Luong
Introduced: 3 Jun 2026
CVE-2026-49975 (opens in a new tab)How to fix?
Upgrade apache/httpd to version 2.4.68 or higher.
Overview
Affected versions of this package are vulnerable to Memory Allocation with Excessive Size Value via the HTTP/2 protocol implementation when HPACK compression is combined with flow control manipulation. An attacker can exhaust server memory and render the service inaccessible by sending specially crafted HTTP/2 requests that trigger excessive memory allocation.
Workaround
This vulnerability can be mitigated by disabling HTTP/2 support for the affected virtual host by adding 'Protocols http/1.1' to the configuration and restarting the service.