Insertion of Sensitive Information Into Sent Data Affecting libcurl package, versions [7.76.0,8.23.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CONAN-LIBCURL-21195890
- published18 Oct 2026
- disclosed14 Oct 2026
- creditUnknown
Introduced: 14 Oct 2026
NewCVE-2026-86409 (opens in a new tab)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 reusing transfer handles across different trust boundaries and attempting to clear AWS SigV4 authentication by resetting the option to null. An attacker can obtain access key identifiers and request signatures by intercepting requests sent to untrusted or attacker-controlled servers. This is only exploitable if an application reuses transfer handles, attempts to clear AWS SigV4 authentication, and subsequently sends requests to untrusted targets.