Unscored severity · published Oct 20, 2026
CVE-2026-92391
curl_mime_free stack overflow by recursion
–
CVSS
0.4%
EPSS
No
On KEV
Description
A deeply nested multipart MIME structure constructed via the public API causes
a stack overflow in libcurl during normal cleanup operations. An excessive
recursion depth within `curl_mime_free` leads to unbounded stack frame
allocation during structure traversal, ultimately crashing the host process.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CU
curl · curl
8.22.0 through 8.22.0; 8.21.0 through 8.21.0; 8.20.0 through 8.20.0; 8.19.0 through 8.19.0; 8.18.0 through 8.18.0; 8.17.0 through 8.17.0; +34 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-92391
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-92391
curl.se
https://curl.se/docs/CVE-2026-92391.html
curl.se
https://curl.se/docs/CVE-2026-92391.json
hackerone.com
https://hackerone.com/reports/4024222
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