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CVE-2026-23918

82
FAUCET Score

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.

First published: May 4, 2026Last modified: May 5, 2026

Impacted Technologies

VendorProductVersion(s)CPE
2.4.66CPE matchmatch criteria
cpe:2.3:a:apache:http_server:2.4.66:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
49.73%
Probability of exploitation in next 30 days
EPSS Percentile
98.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
ExploitDB: EDB-52577 · May 26, 2026
This CVE's current EPSS score of 0.4973 is in the 98th percentile among its peer group of 17,822 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

apachepatch availablevia llm_extracted
Fixed in: 2.4
microsoftpatch availablevia msrc
Product: azl3 httpd 2.4.66-1 on Azure Linux 3.0Fixed in: 2.4.67-1
microsoftpatch availablevia msrc
Product: 21220-17084Fixed in: 2.4.67-1
ubuntupatch availablevia ubuntu_usn
Product: apache2 (noble)Fixed in: 2.4.58-1ubuntu8.12
ubuntupatch availablevia ubuntu_usn
Product: apache2 (questing)Fixed in: 2.4.64-1ubuntu3.4
ubuntupatch availablevia ubuntu_usn
Product: apache2 (resolute)Fixed in: 2.4.66-2ubuntu2.1
ubuntupatch availablevia ubuntu_usn
Product: apache2 (jammy)Fixed in: 2.4.52-1ubuntu4.20
apachevendor investigatingvia vendor_rss
View patch

Vendor Advisories (5)

ubuntuUSN-8239-1

Apache HTTP Server vulnerabilities

May 6, 2026
apacheapache:www.mail-archive.com/[email protected]/msg11043.html

CVE-2026-23918: Apache HTTP Server: http2: double free and possible RCE on early reset

May 4, 2026
microsoft2026-May/CVE-2026-23918Important

Apache HTTP Server: http2: double free and possible RCE on early reset

May 2, 2026
apachellm-apache-f398f8ed28802aa3LOW

Apache HTTP Server 2.4 vulnerabilities - The Apache HTTP Server Project

Mar 2, 2026
apachellm-apache-a7a91ec4c0e9421dHIGH

Apache HTTP Server 2.4 vulnerabilities - The Apache HTTP Server Project

Dec 10, 2025

References

access.redhat.com / errata/RHSA-2026:13938
access.redhat.com / security/cve/CVE-2026-23918
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-23918.json
openwall.com / lists/oss-security/2026/05/04/19
Mailing ListThird Party Advisory
httpd.apache.org / security/vulnerabilities_24.html
Vendor Advisory