Vulnerability Report

CVE-2026-10536

Title: libcurl HTTP/2 stream dependency use-after-free

Memory Corruption

Proof Of Concept

No public PoC currently indexed for CVE-2026-10536.

CWE Category NVD-CWE-noinfo

Published Date Jul 03, 2026

Modified Date Jul 07, 2026

Exploit Status Not Found

Score 9.8 CVSS v

Exploit Probability (EPSS)

0.89%

Vulnerability Summary

CVE-2026-10536: 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.

Impacted Vendors

haxx 1

Reference Links

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

CVSS v3.1

Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0

Severity CRITICAL

9.8

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns