CVE-2026-5773
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| curl | curl | 7.40.0 < 8.14.2 | affected |
| curl | curl | 8.15.0 < 8.16.1 | affected |
| curl | curl | 8.17.0 < 8.20.0 | affected |
| curl | curl | aec2e865f06669b9cb5d26cc1148d70bc418b163 < 74a169575d6412dc0ff532acdf94de35a6c2a571 | affected |
| curl | curl | 8.19.0 | affected |
| curl | curl | 8.18.0 | affected |
| curl | curl | 8.17.0 | affected |
| curl | curl | 8.16.0 | affected |
| curl | curl | 8.15.0 | affected |
| curl | curl | 8.14.1 | affected |
| curl | curl | 8.14.0 | affected |
| curl | curl | 8.13.0 | affected |
| curl | curl | 8.12.1 | affected |
| curl | curl | 8.12.0 | affected |
| curl | curl | 8.11.1 | affected |
| curl | curl | 8.11.0 | affected |
| curl | curl | 8.10.1 | affected |
| curl | curl | 8.10.0 | affected |
| curl | curl | 8.9.1 | affected |
| curl | curl | 8.9.0 | affected |
| curl | curl | 8.8.0 | affected |
| curl | curl | 8.7.1 | affected |
| curl | curl | 8.7.0 | affected |
| curl | curl | 8.6.0 | affected |
| curl | curl | 8.5.0 | affected |
| curl | curl | 8.4.0 | affected |
| curl | curl | 8.3.0 | affected |
| curl | curl | 8.2.1 | affected |
| curl | curl | 8.2.0 | affected |
| curl | curl | 8.1.2 | affected |
| curl | curl | 8.1.1 | affected |
| curl | curl | 8.1.0 | affected |
| curl | curl | 8.0.1 | affected |
| curl | curl | 8.0.0 | affected |
| curl | curl | 7.88.1 | affected |
| curl | curl | 7.88.0 | affected |
| curl | curl | 7.87.0 | affected |
| curl | curl | 7.86.0 | affected |
| curl | curl | 7.85.0 | affected |
| curl | curl | 7.84.0 | affected |
| curl | curl | 7.83.1 | affected |
| curl | curl | 7.83.0 | affected |
| curl | curl | 7.82.0 | affected |
| curl | curl | 7.81.0 | affected |
| curl | curl | 7.80.0 | affected |
| curl | curl | 7.79.1 | affected |
| curl | curl | 7.79.0 | affected |
| curl | curl | 7.78.0 | affected |
| curl | curl | 7.77.0 | affected |
| curl | curl | 7.76.1 | affected |
| curl | curl | 7.76.0 | affected |
| curl | curl | 7.75.0 | affected |
| curl | curl | 7.74.0 | affected |
| curl | curl | 7.73.0 | affected |
| curl | curl | 7.72.0 | affected |
| curl | curl | 7.71.1 | affected |
| curl | curl | 7.71.0 | affected |
| curl | curl | 7.70.0 | affected |
| curl | curl | 7.69.1 | affected |
| curl | curl | 7.69.0 | affected |
| curl | curl | 7.68.0 | affected |
| curl | curl | 7.67.0 | affected |
| curl | curl | 7.66.0 | affected |
| curl | curl | 7.65.3 | affected |
| curl | curl | 7.65.2 | affected |
| curl | curl | 7.65.1 | affected |
| curl | curl | 7.65.0 | affected |
| curl | curl | 7.64.1 | affected |
| curl | curl | 7.64.0 | affected |
| curl | curl | 7.63.0 | affected |
| curl | curl | 7.62.0 | affected |
| curl | curl | 7.61.1 | affected |
| curl | curl | 7.61.0 | affected |
| curl | curl | 7.60.0 | affected |
| curl | curl | 7.59.0 | affected |
| curl | curl | 7.58.0 | affected |
| curl | curl | 7.57.0 | affected |
| curl | curl | 7.56.1 | affected |
| curl | curl | 7.56.0 | affected |
| curl | curl | 7.55.1 | affected |
| curl | curl | 7.55.0 | affected |
| curl | curl | 7.54.1 | affected |
| curl | curl | 7.54.0 | affected |
| curl | curl | 7.53.1 | affected |
| curl | curl | 7.53.0 | affected |
| curl | curl | 7.52.1 | affected |
| curl | curl | 7.52.0 | affected |
| curl | curl | 7.51.0 | affected |
| curl | curl | 7.50.3 | affected |
| curl | curl | 7.50.2 | affected |
| curl | curl | 7.50.1 | affected |
| curl | curl | 7.50.0 | affected |
| curl | curl | 7.49.1 | affected |
| curl | curl | 7.49.0 | affected |
| curl | curl | 7.48.0 | affected |
| curl | curl | 7.47.1 | affected |
| curl | curl | 7.47.0 | affected |
| curl | curl | 7.46.0 | affected |
| curl | curl | 7.45.0 | affected |
| curl | curl | 7.44.0 | affected |
| curl | curl | 7.43.0 | affected |
| curl | curl | 7.42.1 | affected |
| curl | curl | 7.42.0 | affected |
| curl | curl | 7.41.0 | affected |
| curl | curl | 7.40.0 | affected |
Weaknesses
- CWE-488: Exposure of Data Element to Wrong Session
ADP Enrichment
CVE Program Container
Additional References
CISA ADP Vulnrichment
- SSVC:
- Exploitation: poc
- Automatable: yes
- Technical Impact: partial
Additional References
References
- https://curl.se/docs/CVE-2026-5773.json
- https://curl.se/docs/CVE-2026-5773.html
- https://hackerone.com/reports/3650689
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