{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-9545", "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "state": "PUBLISHED", "assignerShortName": "curl", "dateReserved": "2026-05-26T06:45:08.680Z", "datePublished": "2026-07-03T06:17:55.931Z", "dateUpdated": "2026-07-03T06:17:55.931Z"}, "containers": {"cna": {"title": "exposing HTTP/3 early data", "descriptions": [{"lang": "en", "value": "In this scenario, libcurl first uses a proper HTTP/3 server for the initial\ntransfers, and when it makes a second transfer to the same site it has been\nreplaced by the attacker's impostor machine - without a valid certificate.\n\nWhen libcurl returns to the hostname the second time with a cached SSL session\n(`CURLOPT_SSL_SESSIONID_CACHE` is not disabled) and early data enabled (the\n`CURLSSLOPT_EARLYDATA` bit is set in `CURLOPT_SSL_OPTIONS`), libcurl might\nsend off the second request's bytes on that new connection *before* enforcing\nthe certificate verification failure. Potentially leaking sensitive\ninformation."}], "providerMetadata": {"orgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "shortName": "curl", "dateUpdated": "2026-07-03T06:17:55.931Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-200 Exposure of Sensitive Information to an Unauthorized Actor"}]}], "affected": [{"vendor": "curl", "product": "curl", "versions": [{"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"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://curl.se/docs/CVE-2026-9545.json", "name": "json"}, {"url": "https://curl.se/docs/CVE-2026-9545.html", "name": "www"}, {"url": "https://hackerone.com/reports/3752888", "name": "issue"}], "credits": [{"lang": "en", "value": "Eunsoo Kim (Autonomous Code Security team at Microsoft)", "type": "finder"}, {"lang": "en", "value": "Stefan Eissing", "type": "remediation developer"}]}}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.20.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.19.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.18.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.17.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.16.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.15.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.14.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.14.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.13.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.12.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.12.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.11.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.11.0"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "curl", "source": "cna", "vendor": "curl"}, "product": "curl", "vendor": "curl"}], "created": "2026-07-03T07:45:03.409335+00:00", "updated": "2026-07-03T07:45:03.409373+00:00", "vendors": ["curl", "curl$PRODUCT$curl"]}