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CVE-2026-5773

7.5 · HIGH

libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers.

Published May 13, 2026CWE-918EPSS 0.66%

Overview

CVE-2026-5773 is a high-severity vulnerability. It was published on May 13, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refcurl.se/docs/CVE-2026-5773.htmlRefcurl.se/docs/CVE-2026-5773.jsonRefhackerone.com/reports/3650689Refwww.openwall.com/lists/oss-security/2026/04/29/9Refhackerone.com/reports/3650689

How CyberStrike helps

Frequently asked questions

What is CVE-2026-5773?

CVE-2026-5773 is a high-severity vulnerability. It was published on May 13, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-5773?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-5773?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-5773?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-5773 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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