Use After Free Affecting curl package, versions [8.12.0,8.23.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-CURL-20954501
- published15 Oct 2026
- disclosed14 Oct 2026
- creditonn4a_luna
Introduced: 14 Oct 2026
NewCVE-2026-92392 (opens in a new tab)How to fix?
Upgrade curl to version 8.23.0 or higher.
Overview
curl is a command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET and TFTP. libcurl offers a myriad of powerful features.
Affected versions of this package are vulnerable to Use After Free in the multi_done function in lib/multi.c, whose cleanup order ran multi_schedule_pending before the connection was detached and the connection filters had given up their references to the struct Curl_easy. An attacker running the server can free and then reuse that object during an upload by responding with an HTTP/2 RST_STREAM carrying HTTP_1_1_REQUIRED or REFUSED_STREAM. Converting this into code execution requires knowledge of the exact build's structure layout and architecture, a known libc allocator build and heap layout, the allocation geometry contributed by nghttp2, TLS 1.3 session tickets, and a pinned CA bundle, two parallel transfers whose scheduling stays calibrated, a correct libc leak with symbol offsets, and a command of roughly 23 bytes.