High severity · published Mar 11, 2026
CVE-2026-3805
use after free in SMB connection reuse
7.5
CVSS
0.8%
EPSS
No
On KEV
Description
When doing a second SMB request to the same host again, curl would wrongly use
a data pointer pointing into already freed memory.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CU
curl · curl
8.13.0 before 8.14.2; 8.15.0 before 8.16.1; 8.17.0 before 8.19.0; f4831daa9b2a97e8a2921d6b62cc4dfdd0d8646e before e090be9f73a7a71459ef678c7cc4b1f75e3ea883; 8.18.0; 8.17.0; +5 more · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-3805
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-3805
Patch
https://curl.se/docs/CVE-2026-3805.html
Vendor Advisory
https://curl.se/docs/CVE-2026-3805.json
Exploit
https://hackerone.com/reports/3591944
Mailing List
http://www.openwall.com/lists/oss-security/2026/03/11/4
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