# CVE-2026-5773

## Summary

- **CVE ID:** CVE-2026-5773
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
- **CWE:** CWE-488
- **Published:** May 13, 2026
- **Last Modified:** Sep 17, 2026

## 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.

## Affected Products

- curl — curl (8.19.0)
- curl — curl (8.18.0)
- curl — curl (8.17.0)
- curl — curl (8.16.0)
- curl — curl (8.15.0)
- curl — curl (8.14.1)
- curl — curl (8.14.0)
- curl — curl (8.13.0)
- curl — curl (8.12.1)
- curl — curl (8.12.0)
- curl — curl (8.11.1)
- curl — curl (8.11.0)
- curl — curl (8.10.1)
- curl — curl (8.10.0)
- curl — curl (8.9.1)
- curl — curl (8.9.0)
- curl — curl (8.8.0)
- curl — curl (8.7.1)
- curl — curl (8.7.0)
- curl — curl (8.6.0)
- curl — curl (8.5.0)
- curl — curl (8.4.0)
- curl — curl (8.3.0)
- curl — curl (8.2.1)
- curl — curl (8.2.0)
- curl — curl (8.1.2)
- curl — curl (8.1.1)
- curl — curl (8.1.0)
- curl — curl (8.0.1)
- curl — curl (8.0.0)
- curl — curl (7.88.1)
- curl — curl (7.88.0)
- curl — curl (7.87.0)
- curl — curl (7.86.0)
- curl — curl (7.85.0)
- curl — curl (7.84.0)
- curl — curl (7.83.1)
- curl — curl (7.83.0)
- curl — curl (7.82.0)
- curl — curl (7.81.0)
- curl — curl (7.80.0)
- curl — curl (7.79.1)
- curl — curl (7.79.0)
- curl — curl (7.78.0)
- curl — curl (7.77.0)
- curl — curl (7.76.1)
- curl — curl (7.76.0)
- curl — curl (7.75.0)
- curl — curl (7.74.0)
- curl — curl (7.73.0)
- curl — curl (7.72.0)
- curl — curl (7.71.1)
- curl — curl (7.71.0)
- curl — curl (7.70.0)
- curl — curl (7.69.1)
- curl — curl (7.69.0)
- curl — curl (7.68.0)
- curl — curl (7.67.0)
- curl — curl (7.66.0)
- curl — curl (7.65.3)
- curl — curl (7.65.2)
- curl — curl (7.65.1)
- curl — curl (7.65.0)
- curl — curl (7.64.1)
- curl — curl (7.64.0)
- curl — curl (7.63.0)
- curl — curl (7.62.0)
- curl — curl (7.61.1)
- curl — curl (7.61.0)
- curl — curl (7.60.0)
- curl — curl (7.59.0)
- curl — curl (7.58.0)
- curl — curl (7.57.0)
- curl — curl (7.56.1)
- curl — curl (7.56.0)
- curl — curl (7.55.1)
- curl — curl (7.55.0)
- curl — curl (7.54.1)
- curl — curl (7.54.0)
- curl — curl (7.53.1)
- curl — curl (7.53.0)
- curl — curl (7.52.1)
- curl — curl (7.52.0)
- curl — curl (7.51.0)
- curl — curl (7.50.3)
- curl — curl (7.50.2)
- curl — curl (7.50.1)
- curl — curl (7.50.0)
- curl — curl (7.49.1)
- curl — curl (7.49.0)
- curl — curl (7.48.0)
- curl — curl (7.47.1)
- curl — curl (7.47.0)
- curl — curl (7.46.0)
- curl — curl (7.45.0)
- curl — curl (7.44.0)
- curl — curl (7.43.0)
- curl — curl (7.42.1)
- curl — curl (7.42.0)
- curl — curl (7.41.0)
- curl — curl (7.40.0)
- curl — curl (aec2e865f06669b9cb5d26cc1148d70bc418b163)

## References

- [CNA](https://curl.se/docs/CVE-2026-5773.json)
- [CNA](https://curl.se/docs/CVE-2026-5773.html)
- [CNA](https://hackerone.com/reports/3650689)
- [CVE](http://www.openwall.com/lists/oss-security/2026/04/29/9)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.62%
- **EPSS Percentile:** 48.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._