What’s Vulnerable › Vulnerabilities

CVE-2025-14524: bearer token leak on cross-protocol redirect

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-01-08 · updated 2026-09-15
• Weakness: CWE-522

Description

When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a cross-protocol redirect to a second URL that uses an IMAP, LDAP, POP3 or SMTP scheme, curl might wrongly pass on the bearer token to the new target host.

Affected products

• curl: from 7.33.0 before 8.18.0 — fixed in 8.18.0

How to fix

Upgrade to a fixed version: curl 8.18.0. Check the vendor advisory for mitigations.

References

• https://curl.se/docs/CVE-2025-14524.html
• https://curl.se/docs/CVE-2025-14524.json
• https://hackerone.com/reports/3459417
• http://www.openwall.com/lists/oss-security/2026/01/07/4

Get alerted when CVE-2025-14524 or the next vulnerability affects your stack