{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-86409", "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "state": "PUBLISHED", "assignerShortName": "curl", "dateReserved": "2026-09-07T12:11:44.926Z", "datePublished": "2026-10-20T19:57:01.794Z", "dateUpdated": "2026-10-29T18:33:49.983Z" }, "containers": { "cna": { "title": "stale SigV4 headers sent unintended", "descriptions": [ { "lang": "en", "value": "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." } ], "providerMetadata": { "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "shortName": "curl", "dateUpdated": "2026-10-20T19:57:01.794Z" }, "problemTypes": [ { "descriptions": [ { "lang": "en", "description": "CWE-201 Information Exposure Through Sent Data" } ] } ], "affected": [ { "vendor": "curl", "product": "curl", "versions": [ { "version": "8.21.0", "status": "affected", "lessThanOrEqual": "8.21.0", "versionType": "semver" }, { "version": "8.20.0", "status": "affected", "lessThanOrEqual": "8.20.0", "versionType": "semver" }, { "version": "8.19.0", "status": "affected", "lessThanOrEqual": "8.19.0", "versionType": "semver" }, { "version": "8.18.0", "status": "affected", "lessThanOrEqual": "8.18.0", "versionType": "semver" }, { "version": "8.17.0", "status": "affected", "lessThanOrEqual": "8.17.0", "versionType": "semver" }, { "version": "8.16.0", "status": "affected", "lessThanOrEqual": "8.16.0", "versionType": "semver" }, { "version": "8.15.0", "status": "affected", "lessThanOrEqual": "8.15.0", "versionType": "semver" }, { "version": "8.14.1", "status": "affected", "lessThanOrEqual": "8.14.1", "versionType": "semver" }, { "version": "8.14.0", "status": "affected", "lessThanOrEqual": "8.14.0", "versionType": "semver" }, { "version": "8.13.0", "status": "affected", "lessThanOrEqual": "8.13.0", "versionType": "semver" }, { "version": "8.12.1", "status": "affected", "lessThanOrEqual": "8.12.1", "versionType": "semver" }, { "version": "8.12.0", "status": "affected", "lessThanOrEqual": "8.12.0", "versionType": "semver" }, { "version": "8.11.1", "status": "affected", "lessThanOrEqual": "8.11.1", "versionType": "semver" }, { "version": "8.11.0", "status": "affected", "lessThanOrEqual": "8.11.0", "versionType": "semver" }, { "version": "8.10.1", "status": "affected", "lessThanOrEqual": "8.10.1", "versionType": "semver" }, { "version": "8.10.0", "status": "affected", "lessThanOrEqual": "8.10.0", "versionType": "semver" }, { "version": "8.9.1", "status": "affected", "lessThanOrEqual": "8.9.1", "versionType": "semver" }, { "version": "8.9.0", "status": "affected", "lessThanOrEqual": "8.9.0", "versionType": "semver" }, { "version": "8.8.0", "status": "affected", "lessThanOrEqual": "8.8.0", "versionType": "semver" }, { "version": "8.7.1", "status": "affected", "lessThanOrEqual": "8.7.1", "versionType": "semver" }, { "version": "8.7.0", "status": "affected", "lessThanOrEqual": "8.7.0", "versionType": "semver" }, { "version": "8.6.0", "status": "affected", "lessThanOrEqual": "8.6.0", "versionType": "semver" }, { "version": "8.5.0", "status": "affected", "lessThanOrEqual": "8.5.0", "versionType": "semver" }, { "version": "8.4.0", "status": "affected", "lessThanOrEqual": "8.4.0", "versionType": "semver" }, { "version": "8.3.0", "status": "affected", "lessThanOrEqual": "8.3.0", "versionType": "semver" }, { "version": "8.2.1", "status": "affected", "lessThanOrEqual": "8.2.1", "versionType": "semver" }, { "version": "8.2.0", "status": "affected", "lessThanOrEqual": "8.2.0", "versionType": "semver" }, { "version": "8.1.2", "status": "affected", "lessThanOrEqual": "8.1.2", "versionType": "semver" }, { "version": "8.1.1", "status": "affected", "lessThanOrEqual": "8.1.1", "versionType": "semver" }, { "version": "8.1.0", "status": "affected", "lessThanOrEqual": "8.1.0", "versionType": "semver" }, { "version": "8.0.1", "status": "affected", "lessThanOrEqual": "8.0.1", "versionType": "semver" }, { "version": "8.0.0", "status": "affected", "lessThanOrEqual": "8.0.0", "versionType": "semver" }, { "version": "7.88.1", "status": "affected", "lessThanOrEqual": "7.88.1", "versionType": "semver" }, { "version": "7.88.0", "status": "affected", "lessThanOrEqual": "7.88.0", "versionType": "semver" }, { "version": "7.87.0", "status": "affected", "lessThanOrEqual": "7.87.0", "versionType": "semver" }, { "version": "7.86.0", "status": "affected", "lessThanOrEqual": "7.86.0", "versionType": "semver" }, { "version": "7.85.0", "status": "affected", "lessThanOrEqual": "7.85.0", "versionType": "semver" }, { "version": "7.84.0", "status": "affected", "lessThanOrEqual": "7.84.0", "versionType": "semver" }, { "version": "7.83.1", "status": "affected", "lessThanOrEqual": "7.83.1", "versionType": "semver" }, { "version": "7.83.0", "status": "affected", "lessThanOrEqual": "7.83.0", "versionType": "semver" }, { "version": "7.82.0", "status": "affected", "lessThanOrEqual": "7.82.0", "versionType": "semver" }, { "version": "7.81.0", "status": "affected", "lessThanOrEqual": "7.81.0", "versionType": "semver" }, { "version": "7.80.0", "status": "affected", "lessThanOrEqual": "7.80.0", "versionType": "semver" }, { "version": "7.79.1", "status": "affected", "lessThanOrEqual": "7.79.1", "versionType": "semver" }, { "version": "7.79.0", "status": "affected", "lessThanOrEqual": "7.79.0", "versionType": "semver" }, { "version": "7.78.0", "status": "affected", "lessThanOrEqual": "7.78.0", "versionType": "semver" }, { "version": "7.77.0", "status": "affected", "lessThanOrEqual": "7.77.0", "versionType": "semver" }, { "version": "7.76.1", "status": "affected", "lessThanOrEqual": "7.76.1", "versionType": "semver" }, { "version": "7.76.0", "status": "affected", "lessThanOrEqual": "7.76.0", "versionType": "semver" }, { "version": "7.75.0", "status": "affected", "lessThanOrEqual": "7.75.0", "versionType": "semver" } ], "defaultStatus": "unaffected" } ], "references": [ { "url": "https://curl.se/docs/CVE-2026-86409.json", "name": "json" }, { "url": "https://curl.se/docs/CVE-2026-86409.html", "name": "www" }, { "url": "https://hackerone.com/reports/3973135", "name": "issue" } ], "credits": [ { "lang": "en", "value": "Stanislav Fort (Aisle Research)", "type": "finder" }, { "lang": "en", "value": "Viktor Szakats", "type": "remediation developer" } ] }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-201", "lang": "en", "description": "CWE-201 Insertion of Sensitive Information Into Sent Data" } ] } ], "references": [ { "url": "https://hackerone.com/reports/3973135", "tags": [ "exploit" ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2026-10-29T18:33:46.064413Z", "id": "CVE-2026-86409", "options": [ { "Exploitation": "poc" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-29T18:33:49.983Z" } } ] } }