{"id":"GO-2026-5865","revision":null,"records":[{"revision":"8f6c2d123675413a80b4b8eb1bac189b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-100837","aliases":[],"title":"Edgeless Systems Contrast through 1.20.0 Credential Leak via Registry Suffix Matching","description":"Contrast (Edgeless Systems) through 1.20.0 performs unanchored suffix matching when selecting per-registry configuration in the imagepuller. Config.registryFor strips a single trailing dot and then uses strings.HasSuffix(hostname, fqdn) without requiring a DNS label boundary, so a registry entry such as [registries.\"ghcr.io.\"] is also applied to any host whose name merely ends in that byte sequence, including attacker-registered domains such as evilghcr.io. When an image or layer is pulled from such a sibling domain, the imagepuller sends the configured Authorization header (basic auth, registry token, or identity token), trusts the configured custom CA bundle, follows the configured mirror, and honours insecure-skip-verify (disabling TLS verification) for that host. Image integrity is not affected, as image bytes remain pinned by digest in the policy and are validated after the pull. Configurations that use a leading dot (e.g., [registries.\".example.registry\"]) are unaffected.","state":0,"publishedAt":"2026-09-27T01:30:05.443+00:00","modifiedAt":"2026-09-28T13:47:25.357+00:00","affected":[{"ecosystem":"Vendor product","name":"contrast","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"edgelesssys\",\n                    \"product\": \"contrast\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:golang/github.com/edgelesssys/contrast\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThanOrEqual\": \"1.20.0\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","score":6.3,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","score":3.7,"severity":"LOW"}],"references":["https://github.com/edgelesssys/contrast/security/advisories/GHSA-6c87-g9pw-78fx","https://www.vulncheck.com/advisories/edgeless-systems-contrast-through-1.20.0-credential-leak-via-registry-suffix-matching"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-100837","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-100837","identifiers":["CVE-2026-100837"]},"retained":false,"historicalAffected":[]},{"revision":"55e9f98a8dc24b4bbecfd2ebc2ef0e86","observedAt":"2026-11-11T05:27:47.572+00:00","statement":{"source":"euvd","id":"EUVD-2026-87832","aliases":["CVE-2026-100837","GHSA-frqc-cxqj-qxmv"],"title":"Contrast (Edgeless Systems) through 1.20.0 performs unanchored suffix matching when selecting per-registry configuration in the imagepuller. Config.registryFor strips a single trailing dot and then uses strings.HasSuffix(hostname, fqdn) wit…","description":"Contrast (Edgeless Systems) through 1.20.0 performs unanchored suffix matching when selecting per-registry configuration in the imagepuller. Config.registryFor strips a single trailing dot and then uses strings.HasSuffix(hostname, fqdn) without requiring a DNS label boundary, so a registry entry such as [registries.\"ghcr.io.\"] is also applied to any host whose name merely ends in that byte sequence, including attacker-registered domains such as evilghcr.io. When an image or layer is pulled from such a sibling domain, the imagepuller sends the configured Authorization header (basic auth, registry token, or identity token), trusts the configured custom CA bundle, follows the configured mirror, and honours insecure-skip-verify (disabling TLS verification) for that host. Image integrity is not affected, as image bytes remain pinned by digest in the policy and are validated after the pull. Configurations that use a leading dot (e.g., [registries.\".example.registry\"]) are unaffected.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","score":6.3,"severity":null}],"references":["https://github.com/edgelesssys/contrast/security/advisories/GHSA-6c87-g9pw-78fx","https://www.vulncheck.com/advisories/edgeless-systems-contrast-through-1.20.0-credential-leak-via-registry-suffix-matching"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-87832","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 27, 2026, 1:30:05 AM","dateUpdated":"Sep 28, 2026, 1:47:25 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. 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Config.registryFor strips a single trailing dot and then uses strings.HasSuffix(hostname, fqdn) without requiring a DNS label boundary, so a registry entry such as [registries.\"ghcr.io.\"] is also applied to any host whose name merely ends in that byte sequence, including attacker-registered domains such as evilghcr.io. When an image or layer is pulled from such a sibling domain, the imagepuller sends the configured Authorization header (basic auth, registry token, or identity token), trusts the configured custom CA bundle, follows the configured mirror, and honours insecure-skip-verify (disabling TLS verification) for that host. Image integrity is not affected, as image bytes remain pinned by digest in the policy and are validated after the pull. Configurations that use a leading dot (e.g., [registries.\".example.registry\"]) are unaffected.","state":0,"publishedAt":"2026-09-27T02:17:21.937+00:00","modifiedAt":"2026-09-30T17:32:07.107+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · disclosure@vulncheck.com · Secondary","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/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","score":6.3,"severity":"MEDIUM"},{"system":"CVSS 3.1 · disclosure@vulncheck.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","score":3.7,"severity":"LOW"}],"references":["https://github.com/edgelesssys/contrast/security/advisories/GHSA-6c87-g9pw-78fx","https://www.vulncheck.com/advisories/edgeless-systems-contrast-through-1.20.0-credential-leak-via-registry-suffix-matching"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100837","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-1289"],"productCriteria":[],"sourceDates":{"published":"2026-09-27T02:17:21.937","lastModified":"2026-09-30T17:32:07.107"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-100837","identifiers":["CVE-2026-100837"]},"retained":false,"historicalAffected":[]},{"revision":"20c3ba986dc34aa18efee6150a0a3f2a","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-6c87-g9pw-78fx","aliases":["CVE-2026-100837","GO-2026-5865"],"title":"Contrast's Imagepuller registryFor uses unanchored suffix matching, leaking auth credentials and trusted CA configuration to sibling-domain registries","description":"# Summary\n\n`Config.registryFor` selected a per-registry credential / CA / mirror block by checking `strings.HasSuffix(name, fqdn)` after stripping a single trailing dot.\u00A0\nThe match has no boundary between the configured FQDN and any preceding characters in the request hostname.\nA registry configured as `[registries.\"ghcr.io.\"]` is therefore also applied to any image pulled from a host whose name happens to end in the literal byte sequence `ghcr.io`,\u00A0\nincluding attacker-registered domains such as `evilghcr.io.`\u00A0\nThe imagepuller would then send the configured `Authorization` header (basic auth, registry token, or identity token), trust the configured custom CA bundle,\nfollow the configured mirror, or honour `insecure-skip-verify`, on requests to that hostname.\n\n# Prerequisites\n\nFor this to be applicable, an image or layer must be pulled from a \"sibling\" domain ending in one of the FQDNs configured in the imagepuller config.\nThis may occur due to malicious intent or coincidentally.\n\n# Impact\n\n- Authentication header leaks to the sibling registry.\n- If `insecure-skip-verify` is set on an FQDN, TLS will also not be verified for the sibling registry.\n- Mirrors configured for an FQDN will also be used with the sibling registry.\n\n## Not impacted\n\nImage integrity is **not** impacted. Image bytes remain pinned by digest in the policy and are validated after the pull.\nThis advisory does not allow code substitution.\n\n# Workaround\n\n- If possible, configure explicit subdomains in the imagepuller config. A configuration for `[registries.\".example.registry\"]` is unaffected, only `[registries.\"example.registry\"]` is potentially affected.\n- Audit images and layers configured in the deployment for the existence of sibling domains.\n\n# Patches\n\nAfter this patch, registry matches are determined by exact label equality instead of suffix matching.\nEach `.`-separated part of the FQDN must be an exact match with the corresponding label in the image reference.\n\n# Severity\n\n- `AV:N` because the leak is over the network to a registry under the attacker's control.\u00A0\n- `AC:H` because exploitation requires the operator to have configured a registry FQDN without a leading `.` AND the attacker to control a sibling-suffix domain that the deployment will pull from.\n- `PR:N` for the eventual recipient.\u00A0\n- `S:U` because impact stays in the imagepuller.\u00A0\n- `C:L` for credential leak (no integrity / availability impact).","state":0,"publishedAt":"2026-07-01T18:43:55+00:00","modifiedAt":"2026-09-27T11:55:37.7476595+00:00","affected":[{"ecosystem":"Go","name":"github.com/edgelesssys/contrast","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.21.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"LOW"}],"references":["https://github.com/edgelesssys/contrast/security/advisories/GHSA-6c87-g9pw-78fx","https://github.com/edgelesssys/contrast/commit/10826b1d82613025767fb094e8aa51a7dcfbd2a1","https://github.com/edgelesssys/contrast","https://github.com/edgelesssys/contrast/releases/tag/v1.21.0"],"sourceUrl":"https://github.com/advisories/GHSA-6c87-g9pw-78fx","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-6c87-g9pw-78fx","identifiers":["GHSA-6c87-g9pw-78fx","CVE-2026-100837","GO-2026-5865"]},"retained":false,"historicalAffected":[]},{"revision":"70590ca1186344c0aaf391cbadb90a81","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5865","aliases":["CVE-2026-100837","GHSA-6c87-g9pw-78fx"],"title":"Contrast's Imagepuller registryFor uses unanchored suffix matching, leaking auth credentials and trusted CA configuration to sibling-domain registries in github.com/edgelesssys/contrast","description":"Contrast's Imagepuller registryFor uses unanchored suffix matching, leaking auth credentials and trusted CA configuration to sibling-domain registries in github.com/edgelesssys/contrast","state":0,"publishedAt":"2026-07-07T15:26:37+00:00","modifiedAt":"2026-09-27T11:55:37.7476595+00:00","affected":[{"ecosystem":"Go","name":"github.com/edgelesssys/contrast","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.21.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/edgelesssys/contrast/security/advisories/GHSA-6c87-g9pw-78fx","https://github.com/edgelesssys/contrast/commit/10826b1d82613025767fb094e8aa51a7dcfbd2a1","https://github.com/edgelesssys/contrast/releases/tag/v1.21.0"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5865","license":"OSV · upstream source license applies","key":"osv:GO-2026-5865","identifiers":["GO-2026-5865","CVE-2026-100837","GHSA-6c87-g9pw-78fx"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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