CVE intelligence

CVE-2023-28319

Vulnerability intelligence

Published May 26, 2023Sources checked Oct 29, 2026

7.5HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2023-28319 and is rated High severity with a CVSS score of 7.5. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Aug 12, 2026

Vendor remediation details

CBL-Mariner Releases

Vendor-listed releases

1.72.0-2
8.0.34-1
8.2.1-1
2.16.1-1

CISA KEVNot listedBased on the latest collected catalog

EPSS2.5%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2023-28319?

A use after free vulnerability exists in curl <v8.1.0 in the way libcurl offers a feature to verify an SSH server's public key using a SHA 256 hash. When this check fails, libcurl would free the memory for the fingerprint before it returns an error message containing the (now freed) hash.

This flaw risks inserting sensitive heap-based data into the error message that might be shown to users or otherwise get leaked and revealed.

Source: NVD