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CVE-2026-87865 is an SSH host key verification flaw in libcurl when using the libssh2 backend with a hashed known-host database. An unrelated initial entry can cause a host key mismatch to be reported to the CURLOPT_SSH_KEYFUNCTION callback as a missing key instead. Applications that accept missing keys but reject mismatched keys may consequently accept an unexpected server key. The vulnerability affects curl versions before 8.23.0 and is classified as low severity by the curl project.
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Referenced by an Ubuntu local security check covering curl packages. No individual technical description or vulnerability-specific exploit availability is provided.
An SSH host-key validation flaw in libcurl when using libssh2 and a hashed known_hosts file. An unrelated initial entry can cause an actual key mismatch to be incorrectly reported as a missing key to the application's callback. The advisory rates it Important, with CVSS 3.1 score 7.4. Amazon Linux 2's curl package is affected and awaiting a fix; Amazon Linux 2023 and Amazon Linux 2027 Preview are listed as not affected.
A critical vulnerability affecting curl packages, documented by Tenable Cloud Security plugin 476129. The CVSS v3 score is 9.8, indicating network-based exploitation with low complexity, no privileges or user interaction required, and high confidentiality, integrity, and availability impacts. The content does not identify the underlying flaw. A patch was published on October 14, 2026.
Low-severity vulnerability in curl fixed in version 8.23.0. The article provides no technical details.
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Cross-references every affected SKU, including bundled OEM variants.
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