Authentication bypass in Apache HTTP Server mod_auth_digest
CVE-2026-33006 is a timing attack vulnerability in the mod_auth_digest module of Apache HTTP Server affecting versions through 2.4.66. The flaw allows a remote attacker to exploit timing differences in Digest authentication handling and bypass Digest authentication. Apache identified the issue in mod_auth_digest and fixed it in Apache HTTP Server 2.4.67; the provided context also references the 2.4.x branch fix as revision r1933356.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An authentication bypass vulnerability in Apache HTTP Server fixed in Debian 13.5.
Apache HTTP Server mod_auth_digest flaw affecting Digest authentication handling.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.