{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-5545", "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "state": "PUBLISHED", "assignerShortName": "curl", "dateReserved": "2026-04-04T12:10:07.125Z", "datePublished": "2026-05-13T08:27:26.065Z", "dateUpdated": "2026-05-13T17:46:40.830Z" }, "containers": { "cna": { "title": "wrong reuse of HTTP Negotiate connection", "descriptions": [ { "lang": "en", "value": "libcurl might in some circumstances reuse the wrong connection when asked to\ndo an authenticated HTTP(S) request after a Negotiate-authenticated one, when\nboth use the same host.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a request that was issued by an application could\nwrongfully reuse an existing connection to the same server that was\nauthenticated using different credentials.\n\nAn application that first uses Negotiate authentication to a server with\n`user1:password1` and then does another operation to the same server asking\nfor any authentication method but for `user2:password2` (while the previous\nconnection is still alive) - the second request gets confused and wrongly\nreuses the same connection and sends the new request over that connection\nthinking it uses a mix of user1's and user2's credentials when it is in fact\nstill using the connection authenticated for user1..." } ], "providerMetadata": { "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "shortName": "curl", "dateUpdated": "2026-05-13T08:27:26.065Z" }, "problemTypes": [ { "descriptions": [ { "lang": "en", "description": "CWE-305 Authentication Bypass by Primary Weakness" } ] } ], "affected": [ 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"versionType": "semver" }, { "version": "7.13.2", "status": "affected", "lessThanOrEqual": "7.13.2", "versionType": "semver" }, { "version": "7.13.1", "status": "affected", "lessThanOrEqual": "7.13.1", "versionType": "semver" }, { "version": "7.13.0", "status": "affected", "lessThanOrEqual": "7.13.0", "versionType": "semver" }, { "version": "7.12.3", "status": "affected", "lessThanOrEqual": "7.12.3", "versionType": "semver" }, { "version": "7.12.2", "status": "affected", "lessThanOrEqual": "7.12.2", "versionType": "semver" }, { "version": "7.12.1", "status": "affected", "lessThanOrEqual": "7.12.1", "versionType": "semver" }, { "version": "7.12.0", "status": "affected", "lessThanOrEqual": "7.12.0", "versionType": "semver" }, { "version": "7.11.2", "status": "affected", "lessThanOrEqual": "7.11.2", "versionType": "semver" }, { "version": "7.11.1", "status": "affected", "lessThanOrEqual": "7.11.1", "versionType": "semver" }, { "version": "7.11.0", "status": "affected", "lessThanOrEqual": "7.11.0", "versionType": "semver" }, { "version": "7.10.8", "status": "affected", "lessThanOrEqual": "7.10.8", "versionType": "semver" }, { "version": "7.10.7", "status": "affected", "lessThanOrEqual": "7.10.7", "versionType": "semver" }, { "version": "7.10.6", "status": "affected", "lessThanOrEqual": "7.10.6", "versionType": "semver" } ], "defaultStatus": "unaffected" } ], "references": [ { "url": "https://curl.se/docs/CVE-2026-5545.json", "name": "json" }, { "url": "https://curl.se/docs/CVE-2026-5545.html", "name": "www" }, { "url": "https://hackerone.com/reports/3642555", "name": "issue" } ], "credits": [ { "lang": "en", "value": "Quac Tran and Ngoc Hieu", "type": "finder" }, { "lang": "en", "value": "Stefan Eissing", "type": "remediation developer" } ] }, "adp": [ { "references": [ { "url": "https://hackerone.com/reports/3642555", "tags": [ "exploit" ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2026-05-13T17:46:36.115262Z", "id": "CVE-2026-5545", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-13T17:46:40.830Z" } } ] } }