AIKIDO-2026-488356
urllib is vulnerable to Exposure of Sensitive Information to an Unauthorized Actor
75
High Risk
This Affects:
urllibTL;DR
urllib follows HTTP redirects when followRedirect is enabled and reuses the caller-supplied request options on each hop. On a cross-origin redirect it forwards credential-bearing headers such as Authorization, Cookie, and Proxy-Authorization, and re-applies the auth/digestAuth options, to the new origin. An attacker-controlled, compromised, or misconfigured redirect target can therefore receive credentials that were intended only for the original host. The fix detects cross-origin redirects and strips these credential headers and clears auth/digestAuth, while leaving same-origin redirects and the caller's headers object unchanged.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you send authenticated requests with credential-bearing headers or auth/digestAuth while following redirects.
Background info
urllib is vulnerable to Exposure of Sensitive Information to an Unauthorized Actor in versions 4.0.0 - 4.9.0 and 0.0.1 - 2.44.0.
How to fix this
Upgrade the urllib library to the patch version.
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SOC 2Compliant
ISO 27001Compliant