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CVE-2026-49975

HighPublished

Apache HTTP Server: mod_http2 denial of service

Published: Jun 8, 2026
Updated: Aug 19, 2026
Assigning CNA: apache
Evidence observed: Aug 8, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS probability estimate

34.3%

Moderate · next 30 days

Percentile: 98.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-49975PoC
HTTP2-Bomb
Proof-of-Concept-POC---CVE-2026-49975-HTTP-2-Bomb-PoC
Proof-of-concept exploit for CVE-2026-49975 (HTTP/2 Bomb), a remote denial-of-service vulnerability affecting major web servers via HPACK bomb and Slowloris-style memory exhaustion.
CVE-2026-49975PoC
CVE-2026-49975
CVE-2026-49975-POC

Responsible use

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PoC

HTTP/2 Bomb PoC — CVE-2026-49975 (HPACK indexed reference bomb + flow-control stall)

POC-CVE-2026-49975PoC

Security research PoC for CVE-2026-49975: HTTP/2 HPACK compression bomb + flow-control hold DoS in Apache mod_http2

cve-2026-49975-http2bomb_reproductionPoC

PoC exploit for CVE-2026-49975 HTTP/2 Bomb DoS vulnerability. Demonstrates HPACK indexed reference bomb combined with flow-control window stall to exhaust server memory via single connection.

CVE-2026-49975Exploit

CVE-2026-49975漏洞复现

CVE-2026-49975PoC

HTTP/2 Bomb

http2-bombPoC

Proof of Concept (PoC) for CVE-2026-49975 – HTTP/2 server memory exhaustion attack leveraging HPACK amplification and connection retention (HTTP/2 Slowloris).

http2-bomb-analysis-paperResearch

HTTP/2 Bomb: HPACK indexed-reference amplification + flow-control stall. A high school student's full protocol analysis (LaTeX). CVE-2026-49975, CVE-2026-47774.

http2-bombPoC

CVE-2026-49975 HTTP/2 Stream Amplification — Docker PoC with Web Console