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Vulnerabilities

Vulnerability · CVE-2026-23918

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol.

Published May 4, 2026 · catalog updated Jul 15, 2026 · Apache http server

Check this week

CVE-2026-23918 is not in CISA KEV. FIRST estimates a 49.73% chance of exploitation in the next 30 days. Check whether you run Apache http server.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
49.73%
Remediation
Advisory link
Affected products
cpe apache/http server

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe apache/http server2.4.66

How to fix CVE-2026-23918

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-23918 is not in CISA KEV. FIRST estimates a 49.73% chance of exploitation in the next 30 days. Check whether you run Apache http server.

Which versions are affected?

Compare what you have installed with apache/http server 2.4.66. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-1341; CWE-415: Double Free. EPSS 49.73%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 15, 2026 · NIST NVD

    Updated

    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.

  2. Oct 15, 2026 · Apache Software Foundation

    Detected

    Named on the public Apache Software Foundation page.

Sources

  • Apache Software FoundationVendor advisoryCVE-2026-23918

    CVE-2026-23918 is named on the public Apache Software Foundation page.

    httpd.apache.org
  • CVE.orgVulnerability recordCVE-2026-23918

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-23918

    30-day exploitation probability 49.7%

    first.org
  • NIST NVDVulnerability recordCVE-2026-23918

    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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.