x-oauth2-jws: Improper Validation of Syntactic Correctness of Input (CVE-2025-22868) #shorts

Summary

In today's episode, we dive into CVE-2025-22868, a newly discovered vulnerability affecting the Go programming framework. This vulnerability could lead to a Denial of Service attack, impacting services that rely on OAuth2 authentication.

Product details

The vulnerability specifically targets the golang.org/x/oauth2 package, particularly the golang.org/x/oauth2/jws module. Versions up to 0.26.x are impacted. This package is crucial for handling JSON Web Signatures within Go applications.

Vulnerability type summary

CVE-2025-22868 has been categorized under CWE-1286, which describes an Improper Validation of Syntactic Correctness of Input. Essentially, the vulnerability arises from incorrect handling of input data, specifically malformed tokens.

Details of the vulnerability

The primary issue lies in how the affected package processes tokens. An attacker can introduce a malicious, malformed token, causing excessive memory allocation during parsing, leading to potential Denial of Service conditions. This has prompted several Linux distributions, including SUSE, to release security advisories for related packages like the google-cloud-sap-agent and google-guest-agent.

Conclusion

As this vulnerability can have significant implications, it's crucial for developers and organizations using the affected Go packages to update to version 0.27.0 or later. Staying vigilant with updates and advisories is key to maintaining secure systems. That's it for today's deep dive into CVE-2025-22868; remember to keep your systems patched and monitored.

This chain involves the following actors

This following systems are involved

Attack entry point

Remediation actions

Exploitation actions

• https://go.dev/cl/652155
• https://go.dev/issue/71490
• https://pkg.go.dev/vuln/GO-2025-3488