CVE-2026-42272

HIGH EPSS 31.5%
Published May 8, 20261mo ago · Modified Jun 17, 20262w ago
7.8 CVSS 4.0
High
Find Similar
Published May 8, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

Description

Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall handles URL-encoded slashes (%2F) in a case-sensitive manner, while percent-encoding is defined to be case-insensitive. As a result, the lowercase equivalent (%2f) is not recognized and therefore not processed as expected when allow_encoded_slashes is set to off (the default setting). This discrepancy can lead to differences in how request paths are interpreted by heimdall and upstream components, which may result in authorization bypass. This issue has been patched in version 0.17.14.

CVSS Details

Base Score
7.8
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
31.5% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 2

CWE-178
CWE-436

References 4

  • github.com https://github.com/dadrus/heimdall/commit/8b0de6aba23a047cfee3081df878271bb17f4351
  • github.com https://github.com/dadrus/heimdall/pull/3207
  • github.com https://github.com/dadrus/heimdall/releases/tag/v0.17.14
  • github.com https://github.com/dadrus/heimdall/security/advisories/GHSA-43jv-5j4x-qv67

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.