Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N H N N U H H N 7.4 .0032 25.5 —
AFFECTED Product Versions Fixed curl 8.20.0 – —
TIMELINE May 26 Reserved by curl Jul 3 EXPLOIT PUBLISHED — CVE-2026-9547 (curl). Public exploit reference added. Jul 3 Published (CNA: curl)
When a libcurl-based application performs transfers via `SCP://` or `SFTP://` and utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an untrusted server. This vulnerability occurs when a server presents a host key type that does not match the specific key type already recorded for that host in the `known_hosts` file. Instead of rejecting the mismatch, the callback mechanism fails to properly enforce the restriction, allowing the connection to succeed without warning and risking a potential man-in-the-middle attack.
| Date | Event | Detail |
|---|---|---|
| May 26, 2026 | Reserved | Reserved by curl |
| July 3, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-9547 (curl). Public exploit reference added. |
| July 3, 2026 | Published | Published (CNA: curl) |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| curl | curl | — | 8.20.0 | — |
Authoritative record: CVE-2026-9547 at cve.org
Vendors: curl
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-9547 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.