Insertion of Sensitive Information Into Sent Data Affecting libcurl package, versions [8.11.1,8.23.0)
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Test your applications- Snyk IDSNYK-CONAN-LIBCURL-21193830
- published18 Oct 2026
- disclosed14 Oct 2026
- creditUnknown
Introduced: 14 Oct 2026
NewCVE-2026-87862 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade libcurl to version 8.23.0 or higher.
Overview
Affected versions of this package are vulnerable to Insertion of Sensitive Information Into Sent Data in the process of importing HSTS cache records when a parent domain entry with subdomain inclusion is loaded before a longer-lived subdomain entry, causing the subdomain policy to be silently dropped. An attacker can intercept sensitive data by capturing unencrypted traffic after the parent policy expires. This is only exploitable if HSTS cache loading is enabled and an attacker is positioned on-path to capture traffic once the parent rule lapses.