CVE-2026-9547 Affecting libcurl-devel package, versions <0:7.76.1-40.el9_8.5


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.33% (25th percentile)

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  • Snyk IDSNYK-ALMALINUX9-LIBCURLDEVEL-18959673
  • published19 Aug 2026
  • disclosed17 Aug 2026

Introduced: 17 Aug 2026

NewCVE-2026-9547  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:9 libcurl-devel to version 0:7.76.1-40.el9_8.5 or higher.
This issue was patched in ALSA-2026:55439.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libcurl-devel package and not the libcurl-devel package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1