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Vulnerabilities CVE-2026-42272

CVE-2026-42272

High
Open
TLP:CLEAR

Heimdall: Case-sensitive handling of URL-encoded slashes may lead to inconsistent path interpretation

NVD CVE.org
Critical Infrastructure

AI Analysis

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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.

Details

CVSS Score
7.8
EPSS Score
0.40%

32.9th percentile

CVSS Vector
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
Confidence
90%
Published
May 8, 2026
Last Modified
May 8, 2026
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