{"id":"CVE-2026-79780","revision":null,"records":[{"revision":"136b726dfd4e4e49b3c60466b8d3966f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-79780","aliases":[],"title":"rclone before v1.75.0 Credential Exposure via S3 Redirect","description":"rclone before v1.75.0 fails to sanitize IBM IAM bearer tokens and SSE-C encryption keys during S3 redirect callbacks, allowing credentials to be preserved across scheme or host changes. Attackers observing network traffic from a trusted endpoint can capture reusable IBM IAM tokens on same-host HTTPS-to-HTTP downgrades or SSE-C keys on cross-origin redirects to access protected S3 objects.","state":0,"publishedAt":"2026-08-25T15:16:09.789+00:00","modifiedAt":"2026-08-25T16:07:21.266+00:00","affected":[{"ecosystem":"Vendor product","name":"rclone","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"rclone\",\n                    \"product\": \"rclone\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:golang/github.com/rclone/rclone\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"1.75.0\"\n                        },\n                        {\n                            \"version\": \"1.75.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","score":6,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/rclone/rclone/security/advisories/GHSA-8mxv-9xhp-86h4","https://www.vulncheck.com/advisories/rclone-before-credential-exposure-via-s3-redirect"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-79780","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-79780","identifiers":["CVE-2026-79780"]},"retained":false,"historicalAffected":[]},{"revision":"080611e0a41e4caf897984f4891e09ca","observedAt":"2026-11-11T16:09:57.75+00:00","statement":{"source":"euvd","id":"EUVD-2026-65538","aliases":["CVE-2026-79780","GHSA-fj78-v5f5-cphq"],"title":"rclone before v1.75.0 fails to sanitize IBM IAM bearer tokens and SSE-C encryption keys during S3 redirect callbacks, allowing credentials to be preserved across scheme or host changes. Attackers observing network traffic from a trusted end…","description":"rclone before v1.75.0 fails to sanitize IBM IAM bearer tokens and SSE-C encryption keys during S3 redirect callbacks, allowing credentials to be preserved across scheme or host changes. 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Attackers observing network traffic from a trusted endpoint can capture reusable IBM IAM tokens on same-host HTTPS-to-HTTP downgrades or SSE-C keys on cross-origin redirects to access protected S3 objects.","state":0,"publishedAt":"2026-08-25T16:17:29.947+00:00","modifiedAt":"2026-09-10T20:46:19.78+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · disclosure@vulncheck.com · Secondary","vector":"CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:H/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,"severity":"MEDIUM"},{"system":"CVSS 3.1 · disclosure@vulncheck.com · Secondary","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/rclone/rclone/security/advisories/GHSA-8mxv-9xhp-86h4","https://www.vulncheck.com/advisories/rclone-before-credential-exposure-via-s3-redirect"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-79780","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-200"],"productCriteria":[],"sourceDates":{"published":"2026-08-25T16:17:29.947","lastModified":"2026-09-10T20:46:19.780"},"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-2026-79780","identifiers":["CVE-2026-79780"]},"retained":false,"historicalAffected":[]},{"revision":"eaa5f74978184b34ae1c66d5786a9a24","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-8mxv-9xhp-86h4","aliases":["BIT-rclone-2026-79780","CVE-2026-79780","GO-2026-6188"],"title":"rclone: S3 Redirect Sanitization Omits IBM IAM Bearer Tokens and SSE-C Keys","description":"## 1. Summary\n\nThe S3 redirect callback strips `X-Amz-Security-Token` when a redirect changes scheme or host, but it does not strip IBM IAM bearer authorization or customer-provided encryption keys. Two independently validated paths remain:\n\n- a same-host HTTPS-to-HTTP redirect preserves `Authorization: Bearer ...` and exposes a reusable IBM IAM token to the plaintext network path;\n- a cross-origin redirect preserves SSE-C and copy-source SSE-C key headers.\n\nThe High rating is driven by the reusable IBM IAM bearer token. The SSE-C cross-origin disclosure is a secondary confidentiality issue. The meaningful threat is a trusted endpoint, gateway, or accelerator that emits an unsafe redirect, followed by an adjacent/on-path observer; describing the originally configured endpoint itself as the attacker would be weak because that endpoint already receives the request secrets.\n\n## 2. Affected Assets & Attack Surface\n\n- S3 redirect policy: `backend/s3/s3.go:1345-1379`\n- IBM IAM signer: `backend/s3/ibm_signer.go:28-40`\n- SSE-C key preparation: `backend/s3/s3.go:1821-1837`\n- Affected operations: requests carrying IBM IAM authorization, SSE-C keys, or copy-source SSE-C keys\n- Confirmed affected version: `<= v1.74.0-240-ga0c09f138`\n\n## 3. Technical Root Cause Analysis\n\n`s3CheckRedirect` applies a one-header denylist:\n\n```go\nif s3RedirectCrossesHost(req, via) {\n    req.Header.Del(\"X-Amz-Security-Token\")\n}\n```\n\nGo removes `Authorization` on some hostname changes, but preserves it for a same-host redirect and does not treat a scheme downgrade as sufficient reason to remove it. Go also has no generic knowledge that the SSE-C headers contain raw encryption keys. The rclone callback recognizes the STS token but not these additional origin-bound secrets.\n\n## 4. Proof-of-Concept & Evidence\n\nUsing the actual redirect callback:\n\n1. An HTTPS endpoint redirected to HTTP on the same hostname.\n2. The plaintext destination received the planted IBM bearer token and SSE-C headers.\n3. A separate redirect to an unrelated hostname caused Go to remove `Authorization`, but the destination still received both SSE-C key headers.\n4. In both cases, rclone removed the planted STS token, proving that the S3-specific callback executed while omitting the other secret classes.\n\nThe related [GHSA-gx4c-2hqx-cw2r](https://github.com/rclone/rclone/security/advisories/GHSA-gx4c-2hqx-cw2r) covers the STS downgrade path and confirms that rclone treats scheme changes as a credential boundary. It does not cover the IBM bearer or SSE-C variants retained here.\n\n## 5. Impact Assessment\n\nA captured IBM bearer token can authorize reads, writes, and deletes within its IAM scope. A disclosed SSE-C key can expose corresponding ciphertext available to the recipient; copy-source keys can expose protected source objects. The exact impact is limited by token policy and the attacker's access to encrypted objects.\n\n## 6. Remediation Guidance\n\n- Reject every HTTPS-to-HTTP redirect before replay.\n- Do not automatically follow secret-bearing cross-origin redirects.\n- On any scheme, host, or effective-port change, remove all authorization, cookies, session tokens, SSE-C fields, copy-source SSE-C fields, and provider-specific credentials.\n- Where redirects are required, allowlist exact destinations and reconstruct/re-sign a new request.\n- Add redirect tests for every secret header class and for scheme, hostname, subdomain, and port changes.","state":0,"publishedAt":"2026-08-05T20:27:50+00:00","modifiedAt":"2026-09-25T14:25:35.7248126+00:00","affected":[{"ecosystem":"Go","name":"github.com/rclone/rclone","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.75.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/rclone/rclone/security/advisories/GHSA-8mxv-9xhp-86h4","https://github.com/rclone/rclone/commit/7543a7a87884aca957590b20b0714078d51af87b","https://github.com/rclone/rclone/commit/9328763d1b73db71e97c0332b19e3747abeb9191","https://github.com/rclone/rclone","https://github.com/rclone/rclone/releases/tag/v1.75.0"],"sourceUrl":"https://github.com/advisories/GHSA-8mxv-9xhp-86h4","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-8mxv-9xhp-86h4","identifiers":["GHSA-8mxv-9xhp-86h4","BIT-rclone-2026-79780","CVE-2026-79780","GO-2026-6188"]},"retained":false,"historicalAffected":[]},{"revision":"f311d33e45a0452592c683b6e48b14eb","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-6188","aliases":["BIT-rclone-2026-79780","CVE-2026-79780","GHSA-8mxv-9xhp-86h4"],"title":"S3 redirect sanitization omits sensitive headers in github.com/rclone/rclone","description":"S3 redirect sanitization omits sensitive headers in github.com/rclone/rclone","state":0,"publishedAt":"2026-08-18T16:38:10+00:00","modifiedAt":"2026-09-25T14:25:35.7248126+00:00","affected":[{"ecosystem":"Go","name":"github.com/rclone/rclone","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.75.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/rclone/rclone/security/advisories/GHSA-8mxv-9xhp-86h4","https://github.com/rclone/rclone/commit/7543a7a87884aca957590b20b0714078d51af87b","https://github.com/rclone/rclone/commit/9328763d1b73db71e97c0332b19e3747abeb9191","https://github.com/rclone/rclone/releases/tag/v1.75.0"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-6188","license":"OSV · upstream source license applies","key":"osv:GO-2026-6188","identifiers":["GO-2026-6188","BIT-rclone-2026-79780","CVE-2026-79780","GHSA-8mxv-9xhp-86h4"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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