CVE-2026-10536

critical · 9.8

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.

9.8

CVSS

0.6%

EPSS (exploit prob.)

47th

EPSS percentile

2026-07-03

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-416

Affected products

Vendor	Product	Affected versions
haxx	curl	>= 7.88.0, < 8.21.0

Check a specific version with /api/v1/cve/match.

References

https://curl.se/docs/CVE-2026-10536.html
https://curl.se/docs/CVE-2026-10536.json
https://hackerone.com/reports/3751697
https://hackerone.com/reports/3751697

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-10536