{"id":"CVE-2026-87865","title":"knownhost callback mismatches key as missing","summary":"When libcurl uses libssh2 with a hashed `known_hosts` file, an unrelated\ninitial entry can cause host key validation to report a key *mismatch* as a\n*missing* key to the `CURLOPT_SSH_KEYFUNCTION` callback.","severity":"none","cwe":["CWE-295"],"vendor":"curl","product":"curl","affected":["curl >= 8.22.0 <= 8.22.0","curl >= 8.21.0 <= 8.21.0","curl >= 8.20.0 <= 8.20.0","curl >= 8.19.0 <= 8.19.0","curl >= 8.18.0 <= 8.18.0","curl >= 8.17.0 <= 8.17.0","curl >= 8.16.0 <= 8.16.0","curl >= 8.15.0 <= 8.15.0","curl >= 8.14.1 <= 8.14.1","curl >= 8.14.0 <= 8.14.0","curl >= 8.13.0 <= 8.13.0","curl >= 8.12.1 <= 8.12.1","curl >= 8.12.0 <= 8.12.0","curl >= 8.11.1 <= 8.11.1","curl >= 8.11.0 <= 8.11.0","curl >= 8.10.1 <= 8.10.1","curl >= 8.10.0 <= 8.10.0","curl >= 8.9.1 <= 8.9.1","curl >= 8.9.0 <= 8.9.0","curl >= 8.8.0 <= 8.8.0","curl >= 8.7.1 <= 8.7.1","curl >= 8.7.0 <= 8.7.0","curl >= 8.6.0 <= 8.6.0","curl >= 8.5.0 <= 8.5.0","curl >= 8.4.0 <= 8.4.0","curl >= 8.3.0 <= 8.3.0","curl >= 8.2.1 <= 8.2.1","curl >= 8.2.0 <= 8.2.0","curl >= 8.1.2 <= 8.1.2","curl >= 8.1.1 <= 8.1.1","curl >= 8.1.0 <= 8.1.0","curl >= 8.0.1 <= 8.0.1","curl >= 8.0.0 <= 8.0.0","curl >= 7.88.1 <= 7.88.1","curl >= 7.88.0 <= 7.88.0","curl >= 7.87.0 <= 7.87.0","curl >= 7.86.0 <= 7.86.0","curl >= 7.85.0 <= 7.85.0","curl >= 7.84.0 <= 7.84.0","curl >= 7.83.1 <= 7.83.1","curl >= 7.83.0 <= 7.83.0","curl >= 7.82.0 <= 7.82.0","curl >= 7.81.0 <= 7.81.0","curl >= 7.80.0 <= 7.80.0","curl >= 7.79.1 <= 7.79.1","curl >= 7.79.0 <= 7.79.0","curl >= 7.78.0 <= 7.78.0","curl >= 7.77.0 <= 7.77.0","curl >= 7.76.1 <= 7.76.1","curl >= 7.76.0 <= 7.76.0"],"published":"2026-10-20","updated":"2026-10-20","sourceUpdated":"2026-10-20T20:15:13.165Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-87865","references":[{"url":"https://curl.se/docs/CVE-2026-87865.json","label":"json"},{"url":"https://curl.se/docs/CVE-2026-87865.html","label":"www"},{"url":"https://hackerone.com/reports/3975408","label":"issue"}],"tags":["cve.org"],"ingestedAt":"2026-10-20T21:19:21.285Z","slug":"CVE-2026-87865","body":"## Overview\n\nWhen libcurl uses libssh2 with a hashed `known_hosts` file, an unrelated\ninitial entry can cause host key validation to report a key *mismatch* as a\n*missing* key to the `CURLOPT_SSH_KEYFUNCTION` callback.\n\n## Affected\n\n- `curl >= 8.22.0 <= 8.22.0`\n- `curl >= 8.21.0 <= 8.21.0`\n- `curl >= 8.20.0 <= 8.20.0`\n- `curl >= 8.19.0 <= 8.19.0`\n- `curl >= 8.18.0 <= 8.18.0`\n- `curl >= 8.17.0 <= 8.17.0`\n- `curl >= 8.16.0 <= 8.16.0`\n- `curl >= 8.15.0 <= 8.15.0`\n- `curl >= 8.14.1 <= 8.14.1`\n- `curl >= 8.14.0 <= 8.14.0`\n- `curl >= 8.13.0 <= 8.13.0`\n- `curl >= 8.12.1 <= 8.12.1`\n- `curl >= 8.12.0 <= 8.12.0`\n- `curl >= 8.11.1 <= 8.11.1`\n- `curl >= 8.11.0 <= 8.11.0`\n- `curl >= 8.10.1 <= 8.10.1`\n- `curl >= 8.10.0 <= 8.10.0`\n- `curl >= 8.9.1 <= 8.9.1`\n- `curl >= 8.9.0 <= 8.9.0`\n- `curl >= 8.8.0 <= 8.8.0`\n- `curl >= 8.7.1 <= 8.7.1`\n- `curl >= 8.7.0 <= 8.7.0`\n- `curl >= 8.6.0 <= 8.6.0`\n- `curl >= 8.5.0 <= 8.5.0`\n- `curl >= 8.4.0 <= 8.4.0`\n- `curl >= 8.3.0 <= 8.3.0`\n- `curl >= 8.2.1 <= 8.2.1`\n- `curl >= 8.2.0 <= 8.2.0`\n- `curl >= 8.1.2 <= 8.1.2`\n- `curl >= 8.1.1 <= 8.1.1`\n- `curl >= 8.1.0 <= 8.1.0`\n- `curl >= 8.0.1 <= 8.0.1`\n- `curl >= 8.0.0 <= 8.0.0`\n- `curl >= 7.88.1 <= 7.88.1`\n- `curl >= 7.88.0 <= 7.88.0`\n- `curl >= 7.87.0 <= 7.87.0`\n- `curl >= 7.86.0 <= 7.86.0`\n- `curl >= 7.85.0 <= 7.85.0`\n- `curl >= 7.84.0 <= 7.84.0`\n- `curl >= 7.83.1 <= 7.83.1`\n- `curl >= 7.83.0 <= 7.83.0`\n- `curl >= 7.82.0 <= 7.82.0`\n- `curl >= 7.81.0 <= 7.81.0`\n- `curl >= 7.80.0 <= 7.80.0`\n- `curl >= 7.79.1 <= 7.79.1`\n- `curl >= 7.79.0 <= 7.79.0`\n- `curl >= 7.78.0 <= 7.78.0`\n- `curl >= 7.77.0 <= 7.77.0`\n- `curl >= 7.76.1 <= 7.76.1`\n- `curl >= 7.76.0 <= 7.76.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}