NULL pointer dereference in Traefik - CVE-2026-27141

Vulnerability identifier: #VU129667

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-27141

CWE-ID: CWE-476

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a null pointer dereference in the HTTP/2 handling component when processing HTTP/2 frames. A remote attacker can send specially crafted HTTP/2 frames to cause a denial of service.

Traefik
IBM Fusion HCI
Fusion Content-Aware Storage
Data Cataloging
Splunk Enterprise

Install security update from vendor's website.

Traefik - addressed in versions 2.11.40, 3.6.10
Fusion Content-Aware Storage - update to 1.1.5
IBM Fusion HCI - update to 2.13.0
Splunk Enterprise - addressed in versions 9.3.12, 9.4.11, 10.0.6, 10.2.3
Data Cataloging - update to 2.5.3

• https://github.com/traefik/traefik/security/advisories/GHSA-4hjq-9h5c-252j

• Multiple vulnerabilities in Traefik
• Splunk Enterprise update for third-party components (May 2026)
• IBM Fusion, IBM Fusion HCI, IBM Fusion Data Cataloging and IBM Fusion Content-Aware Storage update for golang.org/x/net package