Unscored severity · published Oct 20, 2026
CVE-2026-92387
never-ending loop via server response omission
–
CVSS
0.3%
EPSS
No
On KEV
Description
By permanently omitting the final control-response line, a malicious FTP,
IMAP, POP3, or SMTP server can exploit libcurl and completely bypass its
configured transfer timeout mechanism, indefinitely blocking all concurrent
transfers bound to the same multi-handle.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% 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; +11 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-92387
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-92387
curl.se
https://curl.se/docs/CVE-2026-92387.html
curl.se
https://curl.se/docs/CVE-2026-92387.json
hackerone.com
https://hackerone.com/reports/4022003
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