Vulnerability Description
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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Haxx | Curl | >= 7.88.0, < 8.21.0 |
Related Weaknesses (CWE)
References
- https://curl.se/docs/CVE-2026-10536.htmlPatchVendor Advisory
- https://curl.se/docs/CVE-2026-10536.jsonVendor Advisory
- https://hackerone.com/reports/3751697ExploitIssue TrackingThird Party Advisory
- https://hackerone.com/reports/3751697ExploitIssue TrackingThird Party Advisory
FAQ
What is CVE-2026-10536?
CVE-2026-10536 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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_...
How severe is CVE-2026-10536?
CVE-2026-10536 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-10536?
Check the references section above for vendor advisories and patch information. Affected products include: Haxx Curl.