CVE-2026-23918

highpriority · track · 27EPSS 0.497 · 99 %ileexploit · PoCDEEUNLRUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

16 exploits · PoC

Likely / severe?

49.7% (99th) EPSS

CVSS 8.8 · high

Is it mine?

40 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-23

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.

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.18.8highAV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondaryexploitability 2.8 · impact 5.9

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · NCSC-NL NL

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-1341USCWE-415USCWE-415USCWE-415US

exploits (16)

Public proof-of-concept and weaponised exploit code.

EDB-52577Apache HTTP Server 2.4.66 - 'mod_http2' Double-Free Denial of ServicePoC · exploit_db
12lie20/CVE-2026-23918-testThis repository contains a Proof of Concept (PoC) demonstrating the Double Free vulnerability (CVE-2026-23918) in Apache HTTP Server 2.4.66 `mod_http2`.PoC · poc_in_github
Bencodin/CVE-2026-23918-pocBencodin/CVE-2026-23918-pocPoC · poc_in_github
CYFARE/CVE-2026-23918-Apache-HTTP-Server-DoubleFree-PoCCVE-2026-23918-Apache-HTTP-Server-DoubleFree-PoCPoC · poc_in_github
aa022/CVE-2026-23918-Passive-AuditPassive HTTP metadata auditor for CVE-2026-23918 exposure triagePoC · poc_in_github
alt3kx/CVE-2026-23918CVE-2026-23918 Apache mod_http2 Double-Free DetectorPoC · poc_in_github

affected products (40)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
Gentoo Linuxall versionscert_bundDEcpe:/o:gentoo:linux:-
IBM Business Automation Workflow 24.0.0-24.0.1all versionscert_bundDEcpe:/a:ibm:business_automation_workflow:24.0.0_-_24.0.1
IBM Business Automation Workflow 25.0.0-25.0.1all versionscert_bundDEcpe:/a:ibm:business_automation_workflow:25.0.0_-_25.0.1
IBM DevOps Code ClearCase 11.0.0-11.0.0.05all versionscert_bundDEcpe:/a:ibm:devops_code_clearcase:11.0.0_-_11.0.0.05
IBM HTTP Server 8.5all versionscert_bundDEcpe:/a:ibm:http_server:8.5
IBM HTTP Server 9.0all versionscert_bundDEcpe:/a:ibm:http_server:9.0
IBM Rational ClearCase 10.0.0-10.0.1.05all versionscert_bundDEcpe:/a:ibm:rational_clearcase:10.0.0_-_10.0.1.05
IBM Rational ClearCase 9.1.0-9.1.0.10all versionscert_bundDEcpe:/a:ibm:rational_clearcase:9.1.0_-_9.1.0.10
IBM Rational ClearQuest 10.0-10.0.10all versionscert_bundDEcpe:/a:ibm:rational_clearquest:10.0_-_10.0.10
IBM Rational ClearQuest 9.1-9.1.0.11all versionscert_bundDEcpe:/a:ibm:rational_clearquest:9.1_-_9.1.0.11
IBM Tivoli Monitoringall versionscert_bundDEcpe:/a:ibm:tivoli_monitoring:-
Microsoft Azure Linux azl3all versionscert_bundDEcpe:/o:microsoft:azure_linux:azl3
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
RESF Rocky Linuxall versionscert_bundDEcpe:/o:resf:rocky_linux:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Red Hat JBoss Core Servicesall versionscert_bundDEcpe:/a:redhat:jboss_core_services:-
Red Hat JBoss Core Services 1all versionscert_bundDEcpe:/a:redhat:jboss_core_services:1

showing 20 of 40

advisories (5)

Vendor and ecosystem advisories describing this.

NCSC-2026-0134Kwetsbaarheden verholpen in Apache HTTP ServerNL2026-05-06csaf · ncsc_nlNL
Apache Software Foundation heeft meerdere kwetsbaarheden verholpen in Apache HTTP Server.
NCSC-2026-0267Kwetsbaarheden verholpen in Apple MacOSNL2026-07-28csaf · ncsc_nlNL
Apple heeft meerdere kwetsbaarheden verholpen in MacOS, specifiek in de versies Sequoia 15.7.8, Sonoma 14.8.8 en Tahoe 26.x.
WID-SEC-W-2026-1354Apache HTTP Server: Mehrere SchwachstellenDeutsch2026-05-04csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Apache HTTP Server ausnutzen, um erweiterte Privilegien zu erlangen, beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.
WID-SEC-W-2026-2543Apple macOS (Tahoe, Sonoma und Sequoia): Mehrere SchwachstellenDeutsch2026-07-27csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Apple macOS Tahoe, Sonoma und Sequoia ausnutzen, um seine Privilegien zu erhöhen, um beliebigen Programmcode auszuführen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, und um Sicherheitsvorkehrungen zu umgehen.
BIT-apache-2026-23918Apache HTTP Server: http2: double free and possible RCE on early reset2026-05-05vendor · osvUS
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.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund ncsc_nl osv NVD CVE.org MITRE

published 2026-05-04modified 2026-07-15

references (11)

External citations — patches, advisories, analysis.

scry

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