CVE-2026-92392

8.1High

Published 14 Oct 2026 · NVD status: Awaiting Analysis · AI triage by gemini-3.8-flash

8.1High

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None
Impact: Full C/I/A compromise
Weakness: CWE-416

Impact

A malicious HTTP/2 server can cause memory corruption, denial of service, or potential code execution when a client uploads data to it. The attacker needs the curl client to connect and upload to a server they control.

Root cause

curl mishandles server-sent HTTP/2 RST_STREAM frames containing HTTP_1_1_REQUIRED or REFUSED_STREAM during uploads, causing a use-after-free on a struct Curl_easy object.

Affected systems

Versions not listed — check the vendor advisory.

CVSS v3.1 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Fix & remediation

Upgrade curl and libcurl to the patched release specified in the curl advisory, or restrict connections to HTTP/1.1 via --http1.1 to avoid the vulnerable HTTP/2 upload handling if patching must wait.

shell

$ curl --version

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

During an upload, curl mishandles HTTP/2 `RST_STREAM` received from the server (with reason `HTTP_1_1_REQUIRED` or `REFUSED_STREAM`) leading to a use after free of a `struct Curl_easy` object.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-92392