CVE-2026-49975

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.

CVSS v3.1 Score

7.5

HIGH

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

EPSS — Exploit Prediction

0.1147

Probability of exploitation

0.95%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-789 CWE-789

Affected Products

Vendor	Product	Versions
apache	http_server	2.4.17 — 2.4.68
f5	nginx	< 1.29.8
debian	debian_linux	All

References

Advisories & Patches

https://httpd.apache.org/security/vulnerabilities_24.html

Other References

http://www.openwall.com/lists/oss-security/2026/06/03/3 http://www.openwall.com/lists/oss-security/2026/06/08/16 https://lists.debian.org/debian-lts-announce/2026/06/msg00009.html

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-49975? +

CVE-2026-49975 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.1147, placing it in the 1th percentile for exploitation probability.

What products are affected by CVE-2026-49975? +

CVE-2026-49975 affects products from apache, debian, f5, specifically: debian_linux, http_server, nginx. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-49975? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-26618

Erlang is a programming language and runtime system for building massively scalable soft real-time systems with requirements on high availability. …

CVE-2026-53428

Memory Allocation with Excessive Size Value vulnerability in leandrocp mdex allows an unauthenticated attacker to cause a denial of service …

CVE-2024-20260 8.6

A vulnerability in the VPN and management web servers of the Cisco Adaptive Security Virtual Appliance (ASAv) and Cisco Secure …

CVE-2026-40303 7.5

zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, endpoints.GetSessionCookie parses an attacker-supplied cookie …

CVE-2026-33524 7.5

Zserio is a framework for serializing structured data with a compact and efficient way with low overhead. Prior to 2.18.1, …

CVE-2018-25368 7.5

Nord VPN 6.14.31 contains a denial of service vulnerability that allows unauthenticated attackers to crash the application by submitting an …