Wrong reuse of SMB connection in libcurl
CVE-2026-5773 is a low-severity logic flaw in libcurl's SMB(S) connection reuse handling. libcurl maintains a pool of recent connections and reuses them when connection properties match. Due to a logical error, an SMB connection to a given server could be reused for a subsequent transfer targeting a different SMB share on the same server, because the share name was not correctly treated as a required reuse discriminator. In affected versions, this can cause an application request to operate over an existing SMB connection associated with the wrong share, resulting in a download of the wrong file or an upload to the wrong location. The issue affects libcurl and the curl command-line tool in versions 7.40.0 through 8.19.0 inclusive and was fixed in 8.20.0 by ensuring SMB connections are never reused.
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Recent activity
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A high-severity path traversal vulnerability in Langflow's file upload functionality that allows arbitrary file write via crafted multipart filenames sent to POST /api/v2/files.
A curl vulnerability involving improper reuse of an SMB connection.
A low-severity libcurl/curl vulnerability where SMB connections could be incorrectly reused across different shares on the same server, potentially causing files to be downloaded from or uploaded to the wrong location.
Mentioned only as a recent search term; no vulnerability details are provided in the content.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.