CVE-2026-49975— Apache HTTP Server: mod_http2 denial of service
In-the-Wild Activity Observed github_trending · low
Possible ATT&CK Techniques 1AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.17≤ 2.4.67 | affected |
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I. Basic Information for CVE-2026-49975
Vulnerability Information
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Vulnerability Title
Apache HTTP Server: mod_http2 denial of service
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
未经控制的内存分配
Source: NVD (National Vulnerability Database)
Vulnerability Title
Apache HTTP Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache HTTP Server是美国阿帕奇（Apache）基金会的一款开源网页服务器。该服务器具有快速、可靠且可通过简单的API进行扩充的特点。 Apache HTTP Server 2.4.17版本至2.4.67版本存在安全漏洞，该漏洞源于mod_http组件中存在内存分配过大值问题，可能导致通过恶意HTTP请求造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.17 ~ 2.4.67 | - |
II. Public POCs for CVE-2026-49975
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-49975 (1)
Same Patch Batch · Apache Software Foundation · 2026-06-08 · 14 CVEs total
| CVE-2026-48913 | Apache HTTP Server: mod_http2 memory corruption when file handles exhausted | |
| CVE-2026-42536 | Apache HTTP Server: mod_xml2enc heap overflow | |
| CVE-2026-44185 | Apache HTTP Server: Stack Buffer Over-Read in mod_ssl OCSP `send_request` | |
| CVE-2026-34355 | Apache HTTP Server: mod_proxy_html buffer overflow | |
| CVE-2026-44631 | Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow | |
| CVE-2026-44119 | Apache HTTP Server: escalation of privilege through expressions in .htaccess in multiple m | |
| CVE-2026-43951 | Apache HTTP Server: OOB Read in `merge_response_headers` can cause crash | |
| CVE-2026-42535 | Apache HTTP Server: mod_dav_fs protected directory access | |
| CVE-2026-34356 | Apache HTTP Server: ProxyPassReverseCookieMap buffer overflow | |
| CVE-2026-44186 | Apache HTTP Server: Loop in `proxy_ftp_handler` in mod_proxy_ftp | |
| CVE-2026-29170 | Apache HTTP Server: mod_proxy_ftp XSS | |
| CVE-2026-29167 | Apache HTTP Server: mod_ldap per-dir use-after-free | |
| CVE-2026-47430 | Cordova Plugin InAppBrowser: iOS: Arbitrary Cordova callback IDs can be dispatched without |
IV. Related Vulnerabilities
Same product: Apache HTTP Server
- CVE-2026-48913
Apache HTTP Server: mod_http2 memory corruption when file ha - CVE-2026-42536
Apache HTTP Server: mod_xml2enc heap overflow - CVE-2026-44185
Apache HTTP Server: Stack Buffer Over-Read in mod_ssl OCSP ` - CVE-2026-34355
Apache HTTP Server: mod_proxy_html buffer overflow - CVE-2026-44631
Apache HTTP Server: Heap Underflow in `ap_regname` via Signe
Same vendor: Apache Software Foundation
- CVE-2025-64152
Apache IoTDB: Path Traversal Vulnerability - CVE-2025-55017
Apache IoTDB: Path Traversal Vulnerability - CVE-2026-57915
Apache Kerby: Kerberos Pre-Authentication Bypass - CVE-2026-57914
Apache Kerby: StackOverflow on parsing deeply nested ASN1 st - CVE-2026-49486
Apache Airflow FTP provider: FTP Provider does not protect F
Same weakness: CWE-789
- CVE-2026-44967
opentelemetry-cpp: OTLP HTTP exporters read unbounded HTTP r - CVE-2026-10142
kafka-python prior to 2.3.2 Denial of Service via Protocol P - CVE-2026-52759
Ghidra < 12.1.1 - Denial of Service via Uncontrolled Memory - CVE-2026-52753
Ghidra < 12.0.3 - Out-of-Memory in Rust Symbol Demangler via - CVE-2026-41178
OpenTelemetry-Go's baggage parsing no longer caps raw header
V. Comments for CVE-2026-49975
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