CVE-2026-49975

CVE Enrichment

CVSS: 7.5 HIGH
EPSS: 4.17%
EPSS Percentile: 90.87%
CISA KEV: Not listed

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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: [email protected]
Published: 08-Jun-2026 23:16
Last Modified: 19-Aug-2026 19:18
EPSS Date: 2026-10-24
CWE: CWE-789, CWE-409

CVSS Vector


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

Affected Products / Versions

apache / http_server
Version / affected range: * · from (inclusive) 2.4.17 · before (exclusive) 2.4.68
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
debian / debian_linux
Version / affected range: 11.0
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

References

Last enrichment sync: 25-Oct-2026 11:34
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (3)

defects in FortiWeb WAF, FortiOS, and FortiSIEM, and published an advisory detailing the impact of CVE-2026-49975, the HTTP/2 Bomb attack affecting Apache HTTP Server. Fortinet Patches Eight Vulnerabilities Across Its Products
Tracked as CVE-2026-49975 and discovered using OpenAI’s Codex, HTTP/2 Bomb combines previously known attack techniques to knock web servers offline. Citrix Patches NetScaler Flaws, Including HTTP/2 Bomb Vulnerability
Formally tracked as CVE-2026-49975, the vulnerability ironically chains together two features that were expressly designed to save internet bandwidth to help attackers amplify junk traffic by orders of magnitude. ThreatsDay Roundup: Attackers Abuse Trusted Platforms to Deliver Malware and Steal Credentials

CVE (9)

Malware (14)

People (5)

Threat Actors (5)

MITRE ATT&CK (11)

Vendors (7)

Products (22)

Tools (1)

Industries (8)

Countries (4)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.