CVE-2026-42273 | BDVDB-2026-331449 Detail

dadrusheimdall

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.

Impact#

Per CVSS v4.0: confidentiality impact none, integrity impact none, availability impact none. Attack vector: network.

Weaknesses#

CWE-436 Interpretation Conflict
CWE-178 Improper Handling of Case Sensitivity

References#

Exploit#

No public exploit known

History#

Version 12026-05-08Record published in the CVE List.

Published

Published: 2026-05-08
Last modified: 2026-05-08

Vendor information

Vendor: dadrus
Product: heimdall

All dadrus vulnerabilities

Score

7.8 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 23.1.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 0.17.14
Fixed
Not stated

Scoring System

CVSS v4.0

7.8 High

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	None
Privileges Required	None
User Interaction	None
Vulnerable System Confidentiality	None
Vulnerable System Integrity	None
Vulnerable System Availability	None
Subsequent System Confidentiality	High
Subsequent System Integrity	High
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).