Multithreaded LDAPS Vulnerability in libcurl Affecting Secure Transfers
CVE-2025-14017

6.3MEDIUM

Key Information:

Vendor

Curl

Status
Curl
Vendor
CVE Published:
8 January 2026

What is CVE-2025-14017?

A vulnerability exists in libcurl related to multi-threaded LDAPS (LDAP over TLS) transfers. When TLS options are modified in one thread, these changes can unintentionally impact other threads doing concurrent transfers, potentially disabling certificate verification for those threads. This flaw could lead to significant security risks by compromising secure connections across multiple threads, highlighting the importance of careful TLS management in libcurl usage.

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Affected Version(s)

curl 8.17.0

curl 8.16.0

curl 8.15.0

References

https://curl.se/docs/CVE-2025-14017.json
https://curl.se/docs/CVE-2025-14017.html

CVSS V3.1

Score:
6.3
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Stanislav Fort (Aisle Research)
Daniel Stenberg
JSON
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