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CVE-2026-42273

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

HIGH
7.8
CVSS Score
Published: May 8, 2026 at 03:42 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 0.3%
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 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.

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-72h4-mxfc-jx37
x_refsource_MISC
Source: cverecord
https://github.com/dadrus/heimdall/pull/3208
x_refsource_MISC
Source: cverecord
https://github.com/dadrus/heimdall/commit/3d05e56a9e7ef0355f17482b4322054af4e85943
x_refsource_MISC
Source: cverecord
https://github.com/dadrus/heimdall/releases/tag/v0.17.14

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial 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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