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

Exp

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.

Published: 2026-05-04 Last update: 2026-05-04 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-23918 is rated High Exploit Risk (87.8/100): CVSS High severity, with high exploitation likelihood (EPSS 6.76%, 93th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +5.64% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2026-23918

EDB-ID Source Kind Published Link
52577 exploit_db edb 2026-05-26 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-23918

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.12% 6.76% +5.64%
2 2026-06-05 0.95% 1.12% +0.17%
3 2026-05-27 — 0.95% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-23918

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-23918

GitHub Security Advisory for CVE-2026-23918

GHSA-p8fm-9c82-pw4g · Severity: high — Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This...

OS Trackers for CVE-2026-23918

vendor priority summary link
debian unimportant CVE-2026-23918 unimportant priority: Debian including 1 source packages (apache2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2026-23918
redhat high — https://access.redhat.com/security/cve/CVE-2026-23918
suse high CVE-2026-23918 severity important: SUSE including 7 source package names (apache2, apache2-devel, …), 77 product×package rows across 18 product lines (SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS, SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS, … (18 product lines)): Known Not Affected 77. https://www.suse.com/security/cve/CVE-2026-23918/
ubuntu high CVE-2026-23918 high priority: Ubuntu including 1 source packages (apache2), 9 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): not-affected 7, released 2. https://ubuntu.com/security/CVE-2026-23918

Affected software / configurations for CVE-2026-23918

Vendor Product Version Raw CPE
apache http_server 2.4.66 cpe:2.3:a:apache:http_server:2.4.66:*:*:*:*:*:*:*

References for CVE-2026-23918

cvelogic Threat Intelligence