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AlmaLinux 9.6 [TuxCare] Security Update: mod_http2 (ALMALINUX9.6:CLSA-2026:1781259837)

high Nessus Plugin ID 351937

Synopsis

The AlmaLinux host is missing one or more security updates.

Description

The AlmaLinux 9.6 host has a package installed that is affected by a vulnerability as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1781259837 advisory.

 - 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.
 (CVE-2026-49975)

 - CVE-2026-49975, also known as HTTP/2 Bomb, is a remote denial-of-service exploit against most major web servers, including: nginx, Apache httpd, Microsoft IIS, Envoy, Cloudflare Pingor. The vulnerable behavior exists in each server's default HTTP/2 configuration (CVE-2026-49975)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected mod_http2 package based on the guidance in TuxCare advisory ALMALINUX9.6:CLSA-2026:1781259837.

See Also

https://cve.tuxcare.com/els/releases/CLSA-2026:1781259837

http://www.nessus.org/u?c6c6602c

Plugin Details

Severity: High

ID: 351937

File Name: tuxcare_alma_linux_9.6_CLSA-2026-1781259837.nasl

Version: 1.1

Type: Local

Published: 9/30/2026

Updated: 9/30/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7

Percentile: 98.14

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-49975

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 7.7

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/AlmaLinux/release, Host/AlmaLinux/rpm-list, Host/OS/extended-third-party

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/12/2026

Vulnerability Publication Date: 6/3/2026

Reference Information

CVE: CVE-2026-49975

CLSA: 2026:1781259837