CVE-2026-42273

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Source
https://cve.org/CVERecord?id=CVE-2026-42273
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42273.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-42273
Aliases
Downstream
Related
Published
2026-05-08T03:42:50.312Z
Modified
2026-08-07T11:50:18.523301651Z
Severity
  • 7.8 (High) CVSS_V4 - 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 CVSS Calculator
Summary
Heimdall: Case-sensitive host matching may lead to policy bypass
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42273.json",
    "cwe_ids": [
        "CWE-178",
        "CWE-436"
    ]
}
References

Affected packages

Git / github.com/dadrus/heimdall

Affected ranges

Type
GIT
Repo
https://github.com/dadrus/heimdall
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
3d05e56a9e7ef0355f17482b4322054af4e85943
Fixed
c89e65c0d7cc0c2456c067836614ab9190771088
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.17.14"
        }
    ]
}

Affected versions

v0.*
v0.1.0-alpha
v0.10.0-alpha
v0.10.1-alpha
v0.11.0-alpha
v0.11.1-alpha
v0.12.0-alpha
v0.13.0-alpha
v0.14.0-alpha
v0.15.0
v0.16.0
v0.17.0
v0.17.1
v0.17.10
v0.17.11
v0.17.12
v0.17.13
v0.17.2
v0.17.3
v0.17.4
v0.17.5
v0.17.6
v0.17.7
v0.17.8
v0.17.9
v0.2.0-alpha
v0.3.0-alpha
v0.4.0-alpha
v0.4.1-alpha
v0.5.0-alpha
v0.6.0-alpha
v0.6.1-alpha
v0.7.0-alpha
v0.8.0-alpha
v0.8.1-alpha
v0.8.2-alpha
v0.9.0-alpha
v0.9.1-alpha

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42273.json"