Detections
Analytics

RHEL 10 : mod_http2 (RHSA-2026:50538)

high Nessus Plugin ID 332090

Synopsis

The remote Red Hat host is missing one or more security updates for mod_http2.

Description

The remote Redhat Enterprise Linux 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:50538 advisory.

 The mod_h2 Apache httpd module implements the HTTP2 protocol (h2+h2c) on top of libnghttp2 for httpd 2.4 servers.

 Security Fix(es):

 * mod_http2: Apache HTTP Server: HTTP/2 DoS by Memory Increase (CVE-2025-53020)

 * httpd: httpd: HTTP/2 Remote Denial of Service via compression bomb and Slowloris-style attack (CVE-2026-49975)

 * httpd: mod_http2: Apache HTTP Server mod_http2: Use After Free vulnerability allows arbitrary code execution or denial of service. (CVE-2026-48913)

 * httpd: Apache HTTP Server: Out-of-bounds Read in mod_headers and mod_mime (CVE-2026-43951)

 For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

Solution

Update the RHEL mod_http2 package based on the guidance in RHSA-2026:50538.

See Also

https://access.redhat.com/errata/RHSA-2026:50538

https://access.redhat.com/security/updates/classification/#important

https://bugzilla.redhat.com/show_bug.cgi?id=2379343

https://bugzilla.redhat.com/show_bug.cgi?id=2485371

https://bugzilla.redhat.com/show_bug.cgi?id=2486405

https://bugzilla.redhat.com/show_bug.cgi?id=2486415

http://www.nessus.org/u?eaa85938

Plugin Details

Severity: High

ID: 332090

File Name: redhat-RHSA-2026-50538.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 8/5/2026

Updated: 8/5/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6

Percentile: 96.58

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: 7.3

Temporal Score: 6.6

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

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

CVSS Score Source: CVE-2026-48913

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 6.6

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

CPE: cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux_eus:10.0, p-cpe:/a:redhat:enterprise_linux:mod_http2

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/5/2026

Vulnerability Publication Date: 7/8/2025

Reference Information

CVE: CVE-2025-53020, CVE-2026-43951, CVE-2026-48913, CVE-2026-49975

CWE: 125, 401, 409, 825

RHSA: 2026:50538