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CVE-2026-56154

Apache HTTP Server use-after-free

9.8 CRITICALEPSS 0.56%
  1. Published1 Oct 2026

Description

Use After Free vulnerability in Apache HTTP Server's mod_rewrite when using lookahead (%{LA-U:HTTP:...}) This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/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-2026-56154 being actively exploited?

CVE-2026-56154 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.56%.

How severe is CVE-2026-56154?

CVE-2026-56154 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.56% probability of exploitation.

Which products are affected by CVE-2026-56154?

Affected products include Apache HTTP Server.

How do I fix CVE-2026-56154?

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-2026-56154 against the real software inventory on every managed device, every day. 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.