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CVE-2026-42272

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

HIGH
7.8
CVSS Score
Published: May 8, 2026 at 03:40 AM UTC
Updated: October 26, 2026 at 08:10 PM UTC
1 product affected across 1 vendorHeimdall

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Severity
HIGH7.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Heimdall· Dadrus
90%
v < 0.17.14
Affected range stops below 0.17.14, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

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

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-436CWE-178

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