{"id":"CVE-2026-10536","title":"A use-after-free vulnerability exists in libcurl when an application\nconfigures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or\n`CURLOPT_STREAM_DEPENDS_E`, subsequently invokes `curl_easy_reset()`, and\nfinally terminates…","summary":"A use-after-free vulnerability exists in libcurl when an application\nconfigures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or\n`CURLOPT_STREAM_DEPENDS_E`, subsequently invokes `curl_easy_reset()`, and\nfinally terminates…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416","CWE-825"],"vendor":"haxx","product":"curl","affected":["curl >= 7.88.0, < 8.21.0"],"patched":["curl 8.21.0"],"published":"2026-07-03","updated":"2026-09-15","sourceUpdated":"2026-09-15T07:16:25.137","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-10536","references":[{"url":"https://curl.se/docs/CVE-2026-10536.html","label":"2499f714-1537-4658-8207-48ae4bb9eae9"},{"url":"https://curl.se/docs/CVE-2026-10536.json","label":"2499f714-1537-4658-8207-48ae4bb9eae9"},{"url":"https://hackerone.com/reports/3751697","label":"2499f714-1537-4658-8207-48ae4bb9eae9"},{"url":"https://hackerone.com/reports/3751697","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-10536.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-10536"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2496766"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-10536"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-10536"},{"url":"https://access.redhat.com/errata/RHSA-2026:41240"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat","score-dispute"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"total","timestamp":"2026-07-06T18:28:36.822614Z"},"epss":0.00598,"epssPercentile":0.47027,"ingestedAt":"2026-07-04T04:55:39.409Z","scores":{"nvd":9.8,"vendor":4.7},"slug":"CVE-2026-10536","body":"## Overview\n\nA use-after-free vulnerability exists in libcurl when an application\nconfigures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or\n`CURLOPT_STREAM_DEPENDS_E`, subsequently invokes `curl_easy_reset()`, and\nfinally terminates the handle with `curl_easy_cleanup()`. During this final\ncleanup phase, libcurl attempts to access and modify an internal structure\nthat was already freed during the reset operation.\n\n## Affected\n\n- `curl >= 7.88.0, < 8.21.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `curl 8.21.0`\n\n## Vendor advisories\n\n- **RHSA-2026:41240** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-07-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:41240)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-10536.json)","depth":"abyssal","depthScore":66,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":203473,"id":"CVE-2026-10536","ts":1789457645613,"field":"exploit_available","old":"false","new":"true"},{"seq":203472,"id":"CVE-2026-10536","ts":1789457645613,"field":"cvss","old":null,"new":"9.8"},{"seq":203471,"id":"CVE-2026-10536","ts":1789457645613,"field":"severity","old":"none","new":"critical"}]}