Threat Intelligence / CVE / CVE-2026-23918

CVE-2026-23918 — Apache HTTP Server

CVSS v3.1 8.8 (HIGH) · EPSS 0.9% (higher than 76.6% of all scored CVEs) · Priority 7.5/10 · Published 2026-05-04

As of 2026-05-05, CVE-2026-23918 is a HIGH-severity vulnerability in Apache HTTP Server, CVSS v3.1 8.8, EPSS 0.9% (76.6th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-23918, most recently “CVE-2026-23918 — Apache HTTP Server mod_http2 Double Free Enabling Unauthenticated DoS and Possible RCE”.

Last updated: 2026-05-05

What is CVE-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.

The record classifies CVE-2026-23918 under weakness class CWE-415. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 131 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 8.8 — HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST): 0.9% probability of exploitation in the next 30 days, higher than 76.6% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 7.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-05-04, last modified 2026-05-05

Is CVE-2026-23918 being exploited?

It currently carries a trending score of 24 in the Threadlinqs vulnerability feed.

Affected products and versions

Apache Software Foundation: Apache HTTP Server

How to fix CVE-2026-23918

No vendor patch reference has been recorded for CVE-2026-23918 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-23918

1 tracked threat in the Threadlinqs corpus references CVE-2026-23918, either in the campaign’s CVE list or as an indicator on the campaign record.

CVE-2026-23918 — Apache HTTP Server mod_http2 Double Free Enabling Unauthenticated DoS and Possible RCE — CRITICAL · 2026-05-07

Sources

Seeded from cveorg and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

httpd.apache.org

Full detection coverage & IOCs for threats exploiting CVE-2026-23918 are available via the Threadlinqs MCP server (Purple tier). View plans →

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