Description
Server-Side Request Forgery (SSRF) vulnerability
in Apache HTTP Server on Windows
with AllowEncodedSlashes On and MergeSlashes Off allows to potentially leak NTLM
hashes to a malicious server via SSRF and malicious requests or content
Users are recommended to upgrade to version 2.4.66, which fixes the issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.0 – ≤ 2.4.65 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | httpd +5 | 2.4.66-6.hum1 | RHSA-2026:5156 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apache2 | 2.4.66-1.1 | openSUSE-SU-2025:15808-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | apache2 | 2.4.66-r0 | — |
| Alpine v3.23 | apache2 | 2.4.66-r0 | — |
| Alpine v3.22 | apache2 | 2.4.66-r0 | — |
| Alpine v3.21 | apache2 | 2.4.66-r0 | — |
| Alpine v3.20 | apache2 | 2.4.66-r0 | — |
Advisories 8
- WID-SEC-2026-2189 Dell PowerProtect Data Domain: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 2, 2026
- WID-SEC-2025-2750 Apache HTTP Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 1, 2026
- RHSA-2026:5156 Red Hat Security Advisory: Red Hat Hardened Images RPM Release Red Hat Security Advisories (RHSA) · Oct 16, 2026
- WID-SEC-2026-0853 Apple macOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 8, 2026
- WID-SEC-2026-1730 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Jul 16, 2026
- WID-SEC-2026-1203 Oracle Fusion Middleware: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 21, 2026
- NCSC-2026-0102 Kwetsbaarheden verholpen in Apple macOS NCSC-NL (Netherlands) · Mar 25, 2026
- openSUSE-SU-2025:15808-1 apache2-2.4.66-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
References
- https://httpd.apache.org/security/vulnerabilities_24.html vendor-advisory