CVE-2026-23918

HIGHEPSS 99th pctl

8.8

CVSS v3

Description

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This issue affects Apache HTTP Server: 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

CWE-415 CWE-1341

How to fix

Remediation Available

apache2Debian

Fixed in:2.4.67-1~deb12u2CVE-2026-23918

Fixed in:2.4.66-1~deb13u2CVE-2026-23918

Fixed in:2.4.66-5CVE-2026-23918

httpdRed Hat / RHEL

Fixed in:main@noarchRHSA-2026:13938

Fixed in:main@x86_64RHSA-2026:13938

Fixed in:main@srcRHSA-2026:13938

Fixed in:main@aarch64RHSA-2026:13938

httpdRocky

Fixed in:main@aarch64RHSA-2026:13938

Fixed in:main@srcRHSA-2026:13938

Fixed in:main@x86_64RHSA-2026:13938

Fixed in:main@noarchRHSA-2026:13938

apache2Ubuntu

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

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 ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

49.73%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Vendor Advisory1

httpd.apache.org

Third-Party Advisory1

openwall.com

Other references4

Related Vulnerabilities

Other CWE-415 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-25136	Medium	6.5	90%	-	Fix
CVE-2018-0101	Critical	10.0	87%	-	Fix
CVE-2003-0545	Critical	9.8	85%	-	Fix
CVE-2019-3829	Medium	5.3	59%	-	Fix
CVE-2026-33824	Critical	9.8	56%	-	Fix
CVE-2021-3407	Medium	5.5	50%	-	Fix

Common questions

How do I fix CVE-2026-23918?

Published advisories record a fix for 4 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-2026-23918 being actively exploited?

Not that we know of. CVE-2026-23918 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 49.7% is the estimated probability that it will be exploited in the next 30 days. That is higher than 99% of all scored CVEs.

How severe is CVE-2026-23918?

CVE-2026-23918 has a CVSS v3 base score of 8.8, rated important. 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-2026-23918 affect?

Published advisories record a fix for apache2 (Debian), httpd (Red Hat / RHEL), httpd (Rocky), apache2 (Ubuntu). 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 2026-07-15.