CVE-2025-53020

high

Published 2026-06-01 · Modified 2026-06-03

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CVSS v3

—

CVSS v4 NEW

—

not yet in upstream

VIR risk

8.0

Description

Important: httpd:2.4 security update

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

Mitigation details

Source: Red Hat Errata — Red Hat Inc. · View original ↗ · Open-Errata-API

Description mod_http2: Apache HTTP Server: HTTP/2 DoS by Memory Increase Red Hat statement The attack surface can be reduced by disabling HTTP/2 support in Apache. Follow the guidance in Red Hat KCS article to: - Remove h2 and h2c from the Protocols directive - Disable mod_http2 and mod_proxy_http2 modules (if not required) https://access.redhat.com/node/7056356 CVSS v3: 5.3…

Description

mod_http2: Apache HTTP Server: HTTP/2 DoS by Memory Increase

Red Hat statement

The attack surface can be reduced by disabling HTTP/2 support in Apache. Follow the guidance in Red Hat KCS article to: - Remove h2 and h2c from the Protocols directive - Disable mod_http2 and mod_proxy_http2 modules (if not required) https://access.redhat.com/node/7056356

CVSS v3: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)

Errata / fixed releases

Product	Package	Advisory	Released
Red Hat Enterprise Linux 10	`mod_http2-0:2.0.29-4.el10_2`	RHSA-2026:22528	2026-06-03T00:00:00Z
Red Hat Enterprise Linux 8	`httpd:2.4-8100020260519200905.489197e6`	RHSA-2026:22140	2026-06-01T00:00:00Z
Red Hat Enterprise Linux 9	`mod_http2-0:2.0.26-6.el9_8`	RHSA-2026:22551	2026-06-03T00:00:00Z

Package state

Product	Package	State
Red Hat Enterprise Linux 6	`httpd`	Not affected
Red Hat Enterprise Linux 7	`httpd`	Not affected
Red Hat JBoss Core Services	`jbcs-httpd24-httpd`	Affected

Apply commands

bash fix

Apply RHSA-2026:22528 for Red Hat Enterprise Linux 10

yum update -y mod_http2
# or:
dnf upgrade -y mod_http2

Affected

Vendor	Product	Version
redhat	Red Hat Enterprise Linux 6	`Not affected`
redhat	Red Hat Enterprise Linux 7	`Not affected`
redhat	Red Hat JBoss Core Services	`Affected`

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

AlmaLinux Fixed 1 release

Version	Status	Fixed in
8	Fixed	`httpd-filesystem-2.4.37-65.module_el8.10.0+4185+0955a0d7.8.noarch.rpm`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`2.4.64-1`
sid	Fixed	`2.4.64-1`
forky	Fixed	`2.4.64-1`
bullseye	Fixed	`2.4.65-1~deb11u1`
bookworm	Fixed	`2.4.65-1~deb12u1`

Red Hat Fixed 2 releases

Version	Status	Fixed in
9	Fixed	—
8	Fixed	—

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.