CVE-2026-33006

Publication date 5 May 2026

Last updated 14 May 2026

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Why is this CVE low priority?

Apache httpd developers have rated this to be a low-severity issue

Learn more about Ubuntu priority

Status

Show unmaintained releases

Package	Ubuntu Release	Status
apache2	26.04 LTS resolute	Fixed 2.4.66-2ubuntu2.1
	25.10 questing	Fixed 2.4.64-1ubuntu3.4
	24.04 LTS noble	Fixed 2.4.58-1ubuntu8.12
	22.04 LTS jammy	Fixed 2.4.52-1ubuntu4.20
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Needs evaluation

Notes

mdeslaur

The secon

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
apache2	Upstream: 4833b58 Upstream: e66cbab

Severity score breakdown

CVSS version: CVSS v3.0

Base score 4.8 · Medium

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	Low
Integrity impact	Low
Availability impact	None

Scores

Parameter	Value
Base score	4.8 · Medium
Exploitability score	-
Impact score	-

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

References

Related Ubuntu Security Notices (USN)

USN-8239-1
Apache HTTP Server vulnerabilities
6 May 2026

Other references

https://www.cve.org/CVERecord?id=CVE-2026-33006