Vulnerability Description
libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different 'share' than the new subsequent transfer should. This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Haxx | Curl | >= 7.40.0, < 8.20.0 |
Related Weaknesses (CWE)
References
- https://curl.se/docs/CVE-2026-5773.htmlPatchVendor Advisory
- https://curl.se/docs/CVE-2026-5773.jsonVendor Advisory
- https://hackerone.com/reports/3650689ExploitIssue TrackingThird Party Advisory
- http://www.openwall.com/lists/oss-security/2026/04/29/9Mailing ListPatchThird Party Advisory
- https://hackerone.com/reports/3650689ExploitIssue TrackingThird Party Advisory
FAQ
What is CVE-2026-5773?
CVE-2026-5773 is a vulnerability with a CVSS score of 7.5 (HIGH). libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoi...
How severe is CVE-2026-5773?
CVE-2026-5773 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-5773?
Check the references section above for vendor advisories and patch information. Affected products include: Haxx Curl.