Not yet scoredPublished Oct 20, 2026

CVE-2026-87865knownhost callback mismatches key as missing

Updated under an hour ago (Oct 29, 2026, 1:50 PM ET)

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It affects curl. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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When libcurl uses libssh2 with a hashed `known_hosts` file, an unrelated initial entry can cause host key validation to report a key *mismatch* as a *missing* key to the `CURLOPT_SSH_KEYFUNCTION` callback.

CVSS: Not yet scored
Weakness (CWE): CWE-295
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: curl
NVD analysis: Awaiting Analysis
Record last updated: Oct 20, 2026
First seen by InfoSec Signals: Oct 20, 2026

Affected products

Affected products

curl curl curl:curl (from the name)	from 8.22.0 through 8.22.0; from 8.21.0 through 8.21.0; from 8.20.0 through 8.20.0; from 8.19.0 through 8.19.0; from 8.18.0 through 8.18.0; from 8.17.0 through 8.17.0; from 8.16.0 through 8.16.0; from 8.15.0 through 8.15.0; and 50 more ranges	CNA record

References

References

https://curl.se/docs/CVE-2026-87865.json
https://curl.se/docs/CVE-2026-87865.html
https://hackerone.com/reports/3975408

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.