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CVE-2026-10536

critical CVSS 9.8 EPSS 0.6%

A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or `CURLOPT_STREAM_DEPENDS_E`, subsequently invokes `curl_easy_reset()`, and finally terminates the handle with `curl_easy_cleanup()`. During this final cleanup phase, libcurl attempts to access and modify an internal structure that was already freed during the reset operation.

Versions it affects

Software versions checked with the free lookup that CVE-2026-10536 applies to, and the release that fixes it where the sources name one.

curl 8.1.2 fixed in 8.14.2

At a glance

Severity
Critical
CVSS base score
9.8 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.6% probability of exploitation in the next 30 days, higher than 47% of scored vulnerabilities
Weakness
CWE-416
Published
2026-07-03
NVD CVE.org

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