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.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation poc

Automatable yes

Technical Impact total

Affected Vendors & Products

Vendors Products
Curl
  • Curl

No data.

No data.

References
Link Providers
https://curl.se/docs/CVE-2026-10536.html cve-icon cve-icon
https://curl.se/docs/CVE-2026-10536.json cve-icon cve-icon
https://hackerone.com/reports/3751697 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-10536 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-10536 cve-icon
History

Fri, 10 Jul 2026 03:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Thu, 09 Jul 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-825
References
Metrics threat_severity

None

 threat_severity

Moderate

Wed, 08 Jul 2026 17:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Wed, 08 Jul 2026 11:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Tue, 07 Jul 2026 20:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Tue, 07 Jul 2026 08:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Mon, 06 Jul 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Mon, 06 Jul 2026 10:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Mon, 06 Jul 2026 04:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Sun, 05 Jul 2026 17:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Sun, 05 Jul 2026 09:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Sun, 05 Jul 2026 01:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Sat, 04 Jul 2026 12:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Sat, 04 Jul 2026 05:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Fri, 03 Jul 2026 21:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Fri, 03 Jul 2026 13:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Fri, 03 Jul 2026 08:30:00 +0000

Type Values Removed Values Added
First Time appeared Curl
Curl curl
Vendors & Products Curl
Curl curl

Fri, 03 Jul 2026 06:45:00 +0000

Type Values Removed Values Added
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.
Title HTTP/2 stream-dependency tree UAF
References
cve-icon MITRE

Status: PUBLISHED

Assigner: curl

Published: 2026-07-03T06:11:15.378Z

Updated: 2026-07-06T18:29:27.171Z

Reserved: 2026-06-01T11:49:55.548Z

Link: CVE-2026-10536

cve-icon Vulnrichment

Updated: 2026-07-06T18:29:23.421Z

cve-icon NVD

No data.

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-07-03T06:11:15Z

Links: CVE-2026-10536 - Bugzilla