CVE-2026-49975highCWE-409 CWE-789

Apache HTTP Server: mod_http2 denial of service

48Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 7.5epss 28%

from disclosure to weapon0 days

Published on NVDJun 8

1st PoCJun 3

exploitation probability

28%top 2% of all CVEs

observed exploitation

nono source reports it

14 public exploit(s)

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.

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

Affected products

Apache Software Foundation · Apache HTTP Server

public PoCs found — 14

githubgithub.com/mrx-arafat/CVE-2026-49975-POC★ 29 cve_referencegithub.com/EQSTLab/CVE-2026-49975★ 14 githubgithub.com/fevar54/Proof-of-Concept-POC---CVE-2026-49975-HTTP-2-Bomb-★ 6 githubgithub.com/LSG-PolarBear/CVE-2026-49975★ 5 githubgithub.com/obrige/http2-bomb★ 4 githubgithub.com/adminlove520/http2-bomb-detector★ 3 githubgithub.com/LiaoZiqi-GZFLS/CVE-2026-49975★ 2 githubgithub.com/mindcodings/http2-bomb-detector★ 2 githubgithub.com/renzi25031469/CVE-2026-49975-HTTP-2-Bomb★ 2 githubgithub.com/minc-nice-100/http2-bomb-analysis-paper★ 1 githubgithub.com/razureink/cve-2026-49975-http2bomb_reproduction★ 1 githubgithub.com/wlor0623/http2-bomb-detector★ 0 githubgithub.com/Manisso/http2-bomb★ 0 githubgithub.com/0xc03307b/CVE-2026-49975★ 0

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

References