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CVE-2026-73636

Apache HTTP Server authentication bypass

8.1 HIGHEPSS 0.41%
  1. Published1 Oct 2026

Description

Authentication bypass by capture-replay in mod_auth_digest in Apache Software Foundation Apache HTTP Server 2.4.x on all platforms allows a man-in-the-middle (MITM) attacker to replay captured digest authentication credentials via crafted requests that trigger garbage collection of the client's shared memory entry when AuthDigestNonceLifetime is set to 0. Users are recommended to upgrade to version 2.4.69, which fixes this issue.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Apache HTTP Server≥ 2.4.0 < 2.4.69

Remediation

Fixed in
Apache HTTP Server≥ 2.4.69

References

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Frequently asked

Is CVE-2026-73636 being actively exploited?

CVE-2026-73636 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.41%.

How severe is CVE-2026-73636?

CVE-2026-73636 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.41% probability of exploitation.

Which products are affected by CVE-2026-73636?

Affected products include Apache HTTP Server.

How do I fix CVE-2026-73636?

Upgrade affected software to a fixed version, for example Apache HTTP Server 2.4.69 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-73636 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.