High 7.8Published May 7, 2026

CVE-2026-42274Heimdall: Authorization bypass via path normalization mismatch

Updated under an hour ago (Oct 26, 2026, 9:00 PM ET)

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Every CVE for dadrus heimdall

Exploited in the last 30 days

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: 7.8 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-35, CWE-436
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

dadrus heimdall dadrus:heimdall (from the name)	before 0.17.14	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.