{"items":[{"id":"NVI-00016033","kind":"vulnerability","title":"Heimdall: Forwarded Header Injection via Unsanitized Host Header in Proxy Mode","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-4jgr-pg2m-m988","CVE-2026-57209"],"plain_summary":"GitHub lists this reviewed advisory for github.com/dadrus/heimdall. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-0ea2f23a722654f3ea75a3b12149b108"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-29T14:17:57.730Z","value":"7 HIGH (4.0)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-36cf41f7e16fe4922e262849971cac40"},{"kind":"EPSS","as_of":"2026-11-04T12:03:12.000Z","value":"0.488%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.42157. Missing scores are unknown.","source_id":"sr-0ea2f23a722654f3ea75a3b12149b108"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-0a3f7d1684c08872b58c0bd8bbd9c581","url":"https://github.com/advisories/GHSA-4jgr-pg2m-m988","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-4jgr-pg2m-m988","publisher":"GitHub Advisory Database","observed_at":"2026-11-03T22:35:18.117Z"},{"id":"sr-36cf41f7e16fe4922e262849971cac40","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-57209","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-57209","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-08T08:02:57.782Z"},{"id":"sr-0ea2f23a722654f3ea75a3b12149b108","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-57209","publisher":"FIRST EPSS","observed_at":"2026-11-04T23:33:33.053Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-0a3f7d1684c08872b58c0bd8bbd9c581"],"technology":"github.com/dadrus/heimdall","known_exclusions":[],"conditions_summary":"### Summary\n\nWhen 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.\n\n### Vulnerable Code\n\n**File: `proxy/request_context.go` (line 201)**\n\n```go\nentry := \"for=\" + clientIP + \";host=\" + in.Host + \";proto=\" + proto\n```\n\nGo's `net/http` allows commas and semicolons in Host header values. No sanitization is applied before string concatenation.\n\n### PoC\n\n```bash\n# Inject a spoofed IP into the Forwarded header\ncurl -s -H \"Host: evil.com,for=127.0.0.1\" \\\n  \"http://TARGET:PORT/protected-resource\"\n```\n\nThis produces the following `Forwarded` header sent to the upstream service:\n\n```\nForwarded: for=1.2.3.4;host=evil.com, for=127.0.0.1;proto=http\n```\n\nUpstream services that parse the `Forwarded` header according to RFC 7239 will see two entries. If the service trusts the last or any `for=` value, the attacker successfully spoofs `127.0.0.1` as the client IP.\n\n`","public_affected_ranges":["<= 0.17.16"]}],"null_published_at":"2026-11-08T19:53:44.049Z","source_updated_at":"2026-07-20T21:28:48.000Z","source_disclosed_at":"2026-06-18T14:24:41.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-11-03T22:35:18.117Z"},{"id":"NVI-00016033","kind":"vulnerability","title":"Heimdall: Forwarded Header Injection via Unsanitized Host Header in Proxy Mode","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-4jgr-pg2m-m988","CVE-2026-57209"],"plain_summary":"GitHub lists this reviewed advisory for github.com/dadrus/heimdall. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-0ea2f23a722654f3ea75a3b12149b108"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"EPSS","as_of":"2026-11-04T12:03:12.000Z","value":"0.488%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.42157. Missing scores are unknown.","source_id":"sr-0ea2f23a722654f3ea75a3b12149b108"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-0a3f7d1684c08872b58c0bd8bbd9c581","url":"https://github.com/advisories/GHSA-4jgr-pg2m-m988","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-4jgr-pg2m-m988","publisher":"GitHub Advisory Database","observed_at":"2026-11-03T22:35:18.117Z"},{"id":"sr-0ea2f23a722654f3ea75a3b12149b108","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-57209","publisher":"FIRST EPSS","observed_at":"2026-11-04T23:33:33.053Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-0a3f7d1684c08872b58c0bd8bbd9c581"],"technology":"github.com/dadrus/heimdall","known_exclusions":[],"conditions_summary":"### Summary\n\nWhen 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.\n\n### Vulnerable Code\n\n**File: `proxy/request_context.go` (line 201)**\n\n```go\nentry := \"for=\" + clientIP + \";host=\" + in.Host + \";proto=\" + proto\n```\n\nGo's `net/http` allows commas and semicolons in Host header values. No sanitization is applied before string concatenation.\n\n### PoC\n\n```bash\n# Inject a spoofed IP into the Forwarded header\ncurl -s -H \"Host: evil.com,for=127.0.0.1\" \\\n  \"http://TARGET:PORT/protected-resource\"\n```\n\nThis produces the following `Forwarded` header sent to the upstream service:\n\n```\nForwarded: for=1.2.3.4;host=evil.com, for=127.0.0.1;proto=http\n```\n\nUpstream services that parse the `Forwarded` header according to RFC 7239 will see two entries. If the service trusts the last or any `for=` value, the attacker successfully spoofs `127.0.0.1` as the client IP.\n\n`","public_affected_ranges":["<= 0.17.16"]}],"null_published_at":"2026-11-07T14:02:01.390Z","source_updated_at":"2026-07-20T21:28:48.000Z","source_disclosed_at":"2026-06-18T14:24:41.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-11-03T22:35:18.117Z"},{"id":"NVI-00016033","kind":"vulnerability","title":"Heimdall: Forwarded Header Injection via Unsanitized Host Header in Proxy Mode","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-4jgr-pg2m-m988","CVE-2026-57209"],"plain_summary":"GitHub lists this reviewed advisory for github.com/dadrus/heimdall. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-0a3f7d1684c08872b58c0bd8bbd9c581"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-0a3f7d1684c08872b58c0bd8bbd9c581","url":"https://github.com/advisories/GHSA-4jgr-pg2m-m988","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-4jgr-pg2m-m988","publisher":"GitHub Advisory Database","observed_at":"2026-11-03T22:35:18.117Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-0a3f7d1684c08872b58c0bd8bbd9c581"],"technology":"github.com/dadrus/heimdall","known_exclusions":[],"conditions_summary":"### Summary\n\nWhen 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.\n\n### Vulnerable Code\n\n**File: `proxy/request_context.go` (line 201)**\n\n```go\nentry := \"for=\" + clientIP + \";host=\" + in.Host + \";proto=\" + proto\n```\n\nGo's `net/http` allows commas and semicolons in Host header values. No sanitization is applied before string concatenation.\n\n### PoC\n\n```bash\n# Inject a spoofed IP into the Forwarded header\ncurl -s -H \"Host: evil.com,for=127.0.0.1\" \\\n  \"http://TARGET:PORT/protected-resource\"\n```\n\nThis produces the following `Forwarded` header sent to the upstream service:\n\n```\nForwarded: for=1.2.3.4;host=evil.com, for=127.0.0.1;proto=http\n```\n\nUpstream services that parse the `Forwarded` header according to RFC 7239 will see two entries. If the service trusts the last or any `for=` value, the attacker successfully spoofs `127.0.0.1` as the client IP.\n\n`","public_affected_ranges":["<= 0.17.16"]}],"null_published_at":"2026-11-04T10:04:27.868Z","source_updated_at":"2026-07-20T21:28:48.000Z","source_disclosed_at":"2026-06-18T14:24:41.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-03T22:35:18.117Z"}],"next_cursor":null,"snapshot_revision":"42594"}