# CVE-2026-73636 — Apache HTTP Server

> As of 2026-10-01, CVE-2026-73636 is a HIGH-severity vulnerability in Apache HTTP Server, CVSS v3.1 8.1, EPSS 0.4% (33.4th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-73636, most recently “Multiple Vulnerabilities in Apache HTTP Server 2.4.0 through 2.4.68 (20 CVEs, fixed in 2.4.69)”.

**Last updated:** 2026-10-01

## What is CVE-2026-73636?

Authentication bypass by capture-replay in mod_auth_digest in Apache Software Foundation Apache HTTP Server 2.4.x on all platforms allows a man-in-the-middle (MITM) attacker to replay captured digest authentication credentials via crafted requests that trigger garbage collection of the client's shared memory entry when AuthDigestNonceLifetime is set to 0. Users are recommended to upgrade to version 2.4.69, which fixes this issue.

The record classifies CVE-2026-73636 under weakness class [CWE-294](https://intel.threadlinqs.com/cwe/CWE-294). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, 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 22 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.1 — HIGH (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 33.4% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-10-01

## Is CVE-2026-73636 being exploited?

It currently carries a trending score of 41 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Apache Software Foundation](https://intel.threadlinqs.com/vendors/apache-software-foundation): Apache HTTP Server

## How to fix CVE-2026-73636

No vendor patch reference has been recorded for CVE-2026-73636 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-2026-73636

1 tracked threat in the Threadlinqs corpus references CVE-2026-73636, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Multiple Vulnerabilities in Apache HTTP Server 2.4.0 through 2.4.68 (20 CVEs, fixed in 2.4.69)](https://intel.threadlinqs.com/threat/TL-2026-2876) — MEDIUM · 2026-10-02

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-10-10.

**Vendor advisory and patch**

- [httpd.apache.org — vendor advisory](https://httpd.apache.org/security/vulnerabilities_24.html)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-73636
Full detection coverage and IOCs for threats exploiting CVE-2026-73636 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp