CVE-2025-14524 curl CVE debrief

Who should care

Defenders responsible for systems using curl with OAuth2 bearer tokens for HTTP(S) transfers should assess exposure and prioritize patching. This includes teams managing web applications, APIs, and services relying on curl for secure data transfers.

Why it matters

CVE-2025-14524 is a medium-severity vulnerability in curl that can lead to OAuth2 bearer token leaks via cross-protocol redirects. Defenders should prioritize patching affected curl versions, assess exposure in systems using OAuth2 bearer tokens, and monitor for potential misuse. The vulnerability requires verification of affected versions and patch application.

• Potential unauthorized access to sensitive data via leaked bearer tokens
• Possible lateral movement within networks using compromised bearer tokens
• Need for verification of curl versions and patch application
• Potential for monitoring and detection of abnormal bearer token usage

Technical summary

A vulnerability in curl allows OAuth2 bearer tokens to be leaked via cross-protocol redirects to IMAP, LDAP, POP3, or SMTP schemes. This occurs when an OAuth2 bearer token is used for an HTTP(S) transfer that performs a cross-protocol redirect. The vulnerability affects curl versions between 7.33.0 and 8.18.0 and has a CVSS score of 5.3. Defenders should prioritize verifying and applying patches, assessing exposure in systems using OAuth2 bearer tokens for HTTP(S) transfers, and monitoring for potential misuse of bearer tokens in cross-protocol redirects.

Defensive priority

Defenders should prioritize verifying and applying patches for curl versions between 7.33.0 and 8.18.0, assessing exposure in systems using OAuth2 bearer tokens for HTTP(S) transfers, and monitoring for potential misuse of bearer tokens in cross-protocol redirects.

Recommended defensive actions

• Verify and apply patches for curl versions between 7.33.0 and 8.18.0
• Assess exposure in systems using OAuth2 bearer tokens for HTTP(S) transfers
• Monitor for potential misuse of bearer tokens in cross-protocol redirects
• Review and update security configurations for curl usage
• Perform vulnerability scanning to identify affected systems
• Implement compensating controls for exposed systems
• Track exceptions and retest remediated assets

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions of curl. Vendor advisories and a HackerOne report offer additional context.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.