Critical 9.8Published Jul 3, 2026

CVE-2026-10536HTTP/2 stream-dependency tree UAF

Updated under an hour ago (Oct 28, 2026, 8:10 PM ET)

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It affects curl and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 9.8 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: curl
NVD analysis: Modified
Record last updated: Sep 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

curl curl curl:curl (from the name)	from 7.88.0 before 8.14.2; from 8.15.0 before 8.16.1; from 8.17.0 before 8.20.1	CNA record
haxx curl haxx:curl	from 7.88.0 before 8.21.0	NVD

References

References

https://curl.se/docs/CVE-2026-10536.json	vendor-advisory
https://curl.se/docs/CVE-2026-10536.html	patch, vendor-advisory
https://hackerone.com/reports/3751697	exploit, issue-tracking, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.