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CVE-2025-14017

curl: curl: Security bypass due to global TLS option changes in multi-threaded LDAPS transfers

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Severity

Moderate

Red Hat Product Security

4.8

CVSS 3.1

Review impact separately from score.

Published · January 8, 2026

Updated · October 16, 2026

Description

A flaw was found in curl. When performing multi-threaded LDAPS (Lightweight Directory Access Protocol Secure) transfers, changes to Transport Layer Security (TLS) options in one thread could inadvertently apply globally, affecting other concurrent transfers. This could lead to unintended security posture changes, such as disabling certificate verification for other threads. This vulnerability can result in a security bypass, where expected security checks are not performed.

Statement

This vulnerability is rated Moderate for Red Hat. The flaw in curl affects multi-threaded LDAPS transfers where changes to TLS options in one thread could inadvertently apply globally, impacting other concurrent transfers. This could lead to a security bypass if an application relies on specific TLS settings that are then overridden. Impact is limited to applications utilizing libcurl for multi-threaded LDAPS connections that dynamically modify TLS options.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

CVSS / CWE

CVSS 3.1 · 4.8
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

CWE-1058 · Invokable Control Element in Multi-Thread Context with non-Final Static Storable or Member Element