High 7.8Published May 7, 2026

CVE-2026-42273Heimdall: Case-sensitive host matching may lead to policy bypass

Updated under an hour ago (Oct 26, 2026, 12:23 PM ET)

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No exploitation reported and no EPSS estimate yet.

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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 host matching in a case-sensitive manner, while HTTP hostnames are case-insensitive. This discrepancy can result in heimdall failing to match a rule for a request host that differs only in letter casing, potentially causing the request to be classified differently than intended. 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-436, CWE-178
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 8, 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

https://github.com/dadrus/heimdall/security/advisories/GHSA-72h4-mxfc-jx37x-refsource-confirm
https://github.com/dadrus/heimdall/pull/3208x-refsource-misc
https://github.com/dadrus/heimdall/commit/3d05e56a9e7ef0355f17482b4322054af4e85943x-refsource-misc
https://github.com/dadrus/heimdall/releases/tag/v0.17.14x-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.