Use-after-free in cURL - CVE-2026-10536
Published: June 24, 2026
Vulnerability identifier: #VU135070
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-10536
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: curl.haxx.se
Affected software:
cURL
cURL
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in libcurl HTTP/2 stream-dependency handling when resetting and cleaning up an easy handle configured with HTTP/2 stream dependencies. A local user can invoke curl_easy_reset() and then curl_easy_cleanup() on such a handle to cause a denial of service.
The issue only affects libcurl and requires use of the rarely used HTTP/2 stream-dependency options CURLOPT_STREAM_DEPENDS or CURLOPT_STREAM_DEPENDS_E.
How to mitigate CVE-2026-10536
Install security update from vendor's website.