Detections
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Oracle Linux 9 : mod_http2 (ELSA-2026-22551)

high Nessus Plugin ID 323109

Synopsis

The remote Oracle Linux host is missing a security update.

Description

The remote Oracle Linux 9 host has a package installed that is affected by a vulnerability as referenced in the ELSA-2026-22551 advisory.

 - Resolves: RHEL-182417 - mod_http2: HTTP/2: Remote Denial of Service via compression bomb and Slowloris-style attack (CVE-2026-49975)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

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.

See Also

https://linux.oracle.com/errata/ELSA-2026-22551.html

Plugin Details

Severity: High

ID: 323109

File Name: oraclelinux_ELSA-2026-22551.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/26/2026

Updated: 6/26/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

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-2025-53020

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

Vulnerability Information

CPE: cpe:/o:oracle:linux:9, p-cpe:/a:oracle:linux:mod_http2

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/26/2026

Vulnerability Publication Date: 7/8/2025

Reference Information

CVE: CVE-2025-53020