HIGHCVSS v4 7.0Vulnerability
CVE-2026-57209
Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.17, when Heimdall operates in proxy mode, it constructs the Forwarded HTTP header after executing the matched rule pipeline by inserting the incoming request's Host header value directly into the header string without sanitizing commas or semicolons. This allows an attacker to inject additional parameters into the Forwarded header, potentially spoofing IP addresses for upstream services. This issue has been patched in version 0.17.17.
Properties
- Severity
- HIGH
- Nvd fetched at
- 2026-10-23T14:24:59.572098+00:00
- Cvss severity
- HIGH
- Cvss score
- 7
- Retrieved at
- 2026-10-23T14:28:01+00:00
- Score
- 7
- Cvss version
- 4.0
- Last source
- NVD
- Cve id
- CVE-2026-57209
- Cvss vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- First seen by Signal
- 2026-10-23T14:28:01+00:00
- Name
- CVE-2026-57209
- Vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Published at
- 2026-10-23T13:17:11.687
- Last modified
- 2026-10-23T13:17:11.687
Related Entities (2)
HAS_WEAKNESS (2)
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