CVE-2026-33006

MEDIUM

4.8

CVSS v3

Description

A timing attack against mod_auth_digest in Apache HTTP Server 2.4.66 allows a bypass of Digest authentication by a remote attacker. Users are recommended to upgrade to version 2.4.67, which fixes this issue.

CWE-208

How to fix

Remediation Available

apache2Debian

Fixed in:2.4.67-1~deb11u1CVE-2026-33006

Fixed in:2.4.67-1~deb12u2CVE-2026-33006

Fixed in:2.4.67-1~deb13u2CVE-2026-33006

Fixed in:2.4.67-1CVE-2026-33006

httpdRocky

Fixed in:main@x86_64RHSA-2026:17080

Fixed in:main@aarch64RHSA-2026:17080

Fixed in:main@srcRHSA-2026:17080

Fixed in:main@noarchRHSA-2026:17080

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpdRed Hat / RHEL

Fixed in:main@aarch64RHSA-2026:17080

Fixed in:main@srcRHSA-2026:17080

Fixed in:main@x86_64RHSA-2026:17080

Fixed in:main@noarchRHSA-2026:17080

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-coreRed Hat / RHEL

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-coreRocky

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-core-debuginfoRed Hat / RHEL

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-core-debuginfoRocky

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-debuginfoRed Hat / RHEL

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-debuginfoRocky

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-debugsourceRed Hat / RHEL

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-debugsourceRocky

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-develRocky

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-develRed Hat / RHEL

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-filesystemRocky

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-filesystemRed Hat / RHEL

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-manualRocky

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-manualRed Hat / RHEL

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-toolsRed Hat / RHEL

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-toolsRocky

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-tools-debuginfoRocky

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-tools-debuginfoRed Hat / RHEL

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_ldapRocky

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_ldapRed Hat / RHEL

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_ldap-debuginfoRocky

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_ldap-debuginfoRed Hat / RHEL

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_luaRocky

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_luaRed Hat / RHEL

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_lua-debuginfoRed Hat / RHEL

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_lua-debuginfoRocky

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_proxy_htmlRed Hat / RHEL

Fixed in:1:2.4.62-13.el9_8.5RHSA-2026:41906

mod_proxy_htmlRocky

Fixed in:1:2.4.62-13.el9_8.5RHSA-2026:41906

mod_proxy_html-debuginfoRed Hat / RHEL

Fixed in:1:2.4.62-13.el9_8.5RHSA-2026:41906

mod_proxy_html-debuginfoRocky

Fixed in:1:2.4.62-13.el9_8.5RHSA-2026:41906

mod_sessionRocky

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_sessionRed Hat / RHEL

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_session-debuginfoRed Hat / RHEL

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_session-debuginfoRocky

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_sslRed Hat / RHEL

Fixed in:1:2.4.62-13.el9_8.5RHSA-2026:41906

mod_sslRocky

Fixed in:1:2.4.62-13.el9_8.5RHSA-2026:41906

mod_ssl-debuginfoRed Hat / RHEL

Fixed in:1:2.4.62-13.el9_8.5RHSA-2026:41906

mod_ssl-debuginfoRocky

Fixed in:1:2.4.62-13.el9_8.5RHSA-2026:41906

apache2Ubuntu

Fixed in:2.4.7-1ubuntu4.22+esm15USN-8589-1

Fixed in:2.4.18-2ubuntu3.17+esm20USN-8589-1

Fixed in:2.4.29-1ubuntu4.27+esm11USN-8589-1

Fixed in:2.4.41-4ubuntu3.23+esm6USN-8589-1

Fixed in:2.4.52-1ubuntu4.20USN-8239-1

Fixed in:2.4.58-1ubuntu8.12USN-8239-1

Fixed in:2.4.64-1ubuntu3.4USN-8239-1

apache2-binUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm15USN-8589-1

Fixed in:2.4.18-2ubuntu3.17+esm20USN-8589-1

Fixed in:2.4.29-1ubuntu4.27+esm11USN-8589-1

Fixed in:2.4.41-4ubuntu3.23+esm6USN-8589-1

apache2-devUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm15USN-8589-1

Fixed in:2.4.18-2ubuntu3.17+esm20USN-8589-1

Fixed in:2.4.29-1ubuntu4.27+esm11USN-8589-1

Fixed in:2.4.41-4ubuntu3.23+esm6USN-8589-1

apache2-mpm-eventUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm15USN-8589-1

apache2-mpm-itkUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm15USN-8589-1

apache2-mpm-preforkUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm15USN-8589-1

apache2-mpm-workerUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm15USN-8589-1

apache2-ssl-devUbuntu

Fixed in:2.4.29-1ubuntu4.27+esm11USN-8589-1

Fixed in:2.4.41-4ubuntu3.23+esm6USN-8589-1

apache2-suexecUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm15USN-8589-1

apache2-suexec-customUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm15USN-8589-1

Fixed in:2.4.18-2ubuntu3.17+esm20USN-8589-1

Fixed in:2.4.29-1ubuntu4.27+esm11USN-8589-1

Fixed in:2.4.41-4ubuntu3.23+esm6USN-8589-1

apache2-suexec-pristineUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm15USN-8589-1

Fixed in:2.4.18-2ubuntu3.17+esm20USN-8589-1

Fixed in:2.4.29-1ubuntu4.27+esm11USN-8589-1

Fixed in:2.4.41-4ubuntu3.23+esm6USN-8589-1

apache2-utilsUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm15USN-8589-1

Fixed in:2.4.18-2ubuntu3.17+esm20USN-8589-1

Fixed in:2.4.29-1ubuntu4.27+esm11USN-8589-1

Fixed in:2.4.41-4ubuntu3.23+esm6USN-8589-1

apache2.2-binUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm15USN-8589-1

libapache2-mod-macroUbuntu

Fixed in:1:2.4.7-1ubuntu4.22+esm15USN-8589-1

libapache2-mod-mdUbuntu

Fixed in:2.4.41-4ubuntu3.23+esm6USN-8589-1

libapache2-mod-proxy-htmlUbuntu

Fixed in:1:2.4.7-1ubuntu4.22+esm15USN-8589-1

libapache2-mod-proxy-uwsgiUbuntu

Fixed in:2.4.41-4ubuntu3.23+esm6USN-8589-1

httpdWindows application

Affected:2.4.67Fixed in:2.4.67Apache Lounge

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.56%probability of exploitation in 30 days

43rdpercentile

Moderate risk: more likely to be exploited than 43% of all known CVEs.

References

Vendor Advisory1

httpd.apache.org

Third-Party Advisory1

openwall.com

Related Vulnerabilities

Other CWE-208 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-9494	Medium	5.9	3.9%	-	Fix
CVE-2019-16782	Medium	6.3	3.7%	-	Fix
CVE-2025-53940	Unscored	-	2.6%	-	-
CVE-2020-1926	Medium	5.9	2.5%	-	Fix
CVE-2021-43298	Critical	9.8	2.3%	-	Fix
CVE-2024-29995	High	8.1	1.5%	-	Fix

Common questions

How do I fix CVE-2026-33006?

Published advisories record a fix for 59 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-33006 being actively exploited?

Not that we know of. CVE-2026-33006 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.56% is the estimated probability that it will be exploited in the next 30 days. That is higher than 43% of all scored CVEs.

How severe is CVE-2026-33006?

CVE-2026-33006 has a CVSS v3 base score of 4.8, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-33006 affect?

Published advisories record a fix for apache2 (Debian), httpd (Rocky), httpd (Red Hat / RHEL), httpd-core (Red Hat / RHEL), and 55 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-04.