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The vulnerability in `golang.org/x/oauth2` arises due to improper validation of token syntax during parsing. When a maliciously crafted token is processed, the library fails to properly check its structural correctness, leading to excessive memory consumption. Attackers can exploit this by sending malformed OAuth2 tokens, causing the application to allocate unexpected memory resources, potentially leading to denial-of-service (DoS) conditions. The issue stems from insufficient boundary checks in the token parsing logic, allowing invalid input to trigger uncontrolled memory allocation.
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Platform: golang.org/x/oauth2
Version: <2.0.0
Vulnerability: Improper Input Validation
Severity: High
Date: Jul 18, 2025
Prediction: Patch expected by Aug 15, 2025
What Undercode Say:
go list -m golang.org/x/oauth2 go get golang.org/x/[email protected]
How Exploit:
POST /oauth/token HTTP/1.1 Host: vulnerable-app.com Authorization: Bearer MALFORMED_TOKEN_DATA_HERE
Protection from this CVE:
// Update to patched version: go mod tidy go get golang.org/x/oauth2@latest
Impact:
- Denial-of-Service (DoS) via memory exhaustion.
- Potential application crashes under attack.
- Requires token parsing to trigger.
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
