Vulnerability in Apache HTTP Server
CVE-2026-49975
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.042 (90.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.310 · newest: 0.042 · change: -0.269
Affected products
- Apache HTTP Server
- Apache Software Foundation HTTP Server — versions 2.4.17
- F5 nginx
- Debian Linux — versions 11.0
Weakness classification (CWE)
Public proof-of-concept exploits
- mrx-arafat/CVE-2026-49975-POC
- EQSTLab/CVE-2026-49975
- LSG-PolarBear/CVE-2026-49975
- fevar54/Proof-of-Concept-POC---CVE-2026-49975-HTTP-2-Bomb-
- obrige/http2-bomb
- naheeju/POC-CVE-2026-49975
- adminlove520/http2-bomb-detector
- LiaoZiqi-GZFLS/CVE-2026-49975
- razureink/cve-2026-49975-http2bomb_reproduction
- mindcodings/http2-bomb-detector
References
- httpd.apache.org/security/vulnerabilities_24.html (vendor-advisory, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit, Third Party Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-49975?
- CVE-2026-49975 is a high-severity vulnerability in Apache HTTP Server, classified under CWE-789. CVSS score: 7.5/10. Published 2026-06-08.
- How severe is CVE-2026-49975?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2026-49975 known to be exploited?
- 16 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.