{"id":"CVE-2026-86409","revision":"ae08220371a142849e20b88dd3f9ac7e","records":[{"revision":"ae08220371a142849e20b88dd3f9ac7e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-86409","aliases":[],"title":"stale SigV4 headers sent unintended","description":"Setting `CURLOPT_AWS_SIGV4` to NULL but does not disable SigV4 authentication,\ncontrary to expectations and documentation. A subsequent transfer on the same\nhandle still sends an `Authorization: AWS4-HMAC-SHA256` header to whatever URL\nisset next, leaking state information.","state":0,"publishedAt":"2026-10-20T19:57:01.794+00:00","modifiedAt":"2026-10-20T19:57:01.794+00:00","affected":[{"ecosystem":"Vendor product","name":"curl","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"curl\",\n                    \"product\": \"curl\",\n                    \"versions\": [\n                        {\n                            \"version\": \"8.21.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.21.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.20.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.20.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.19.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.19.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.18.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.18.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.17.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.17.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.16.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.16.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.15.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.15.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.14.1\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.14.1\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.14.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.14.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.13.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.13.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.12.1\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.12.1\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.12.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.12.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.11.1\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.11.1\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.11.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.11.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.10.1\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.10.1\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.10.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.10.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.9.1\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.9.1\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.9.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.9.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.8.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.8.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.7.1\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.7.1\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.7.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.7.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.6.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.6.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.5.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.5.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.4.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.4.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.3.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.3.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.2.1\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.2.1\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.2.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.2.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.1.2\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.1.2\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.1.1\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.1.1\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.1.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.1.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.0.1\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.0.1\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"8.0.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"8.0.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.88.1\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.88.1\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.88.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.88.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.87.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.87.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.86.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.86.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.85.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.85.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.84.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.84.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.83.1\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.83.1\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.83.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.83.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.82.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.82.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.81.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.81.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.80.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.80.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.79.1\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.79.1\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.79.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.79.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.78.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.78.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.77.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.77.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.76.1\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.76.1\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.76.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.76.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.75.0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"7.75.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[],"references":["https://curl.se/docs/CVE-2026-86409.json","https://curl.se/docs/CVE-2026-86409.html","https://hackerone.com/reports/3973135"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-86409","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-86409","identifiers":["CVE-2026-86409"]},"retained":false,"historicalAffected":[]}],"coverage":[]}