Vulnerability details

CVE-2026-42274

dadrus heimdall

Heimdall: Authorization bypass via path normalization mismatch

CVSS 4.0

7.8High

Official description

Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs rule matching on the raw (non-normalized) request path, while downstream components may normalize dot-segments according to RFC 3986, Section 6.2.2.3. This discrepancy can result in heimdall authorizing a request for one path (e.g., /user/../admin, or URL-encoded variants such as /user/%2e%2e/admin or /user/%2e%2e%2fadmin. The latter would require the allow_encoded_slashes option to be set to on or no_decode.) while the downstream ultimately processes a different, normalized path (/admin). This issue has been patched in version 0.17.14.

CVSS scores

Score	Version	Source	Vector
7.8High	4.0	CVEProject cvelistV5 (CNA) (GitHub_M)	`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`

Affected products

Vendor	Product	Versions	Source
dadrus	heimdall	< 0.17.14	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/dadrus/heimdall/security/advisories/GHSA-3q34-rx83-r6mq x_refsource_CONFIRM
https://github.com/dadrus/heimdall/pull/3209 x_refsource_MISC
https://github.com/dadrus/heimdall/commit/b5dfa484b7a8c2ce6d8691c026f9da867719947a x_refsource_MISC
https://github.com/dadrus/heimdall/releases/tag/v0.17.14 x_refsource_MISC

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Details

Published: 2026-05-08
Last updated: 2026-05-11
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.36%

Probability of exploitation in 30 days

30.8%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-35
Path Traversal: '.../...//'
CWE-436
Interpretation Conflict