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Date: Tue, 18 Apr 2023 17:46:30 +0200
From: Stig Palmquist <>
Subject: Perl's HTTP::Tiny has insecure TLS cert default, affecting
 and other modules

HTTP::Tiny v0.082, a Perl core module since v5.13.9 and available
standalone on CPAN, does not verify TLS certs by default. Users must
opt-in with the verify_SSL=>1 flag to verify certs when using HTTPS.

We grepped trough CPAN to find distributions using HTTP::Tiny that
didn't specify cert verification behaviour, possibly exposing users to
mitm attacks. Here are some examples with patches:

- v2.34 downloads and executes code from
  without verifying server certs. Fixed in v2.35-TRIAL.

- GitLab::API::v4 v0.26 exposes API secrets to a network attacker.

- Finance::Robinhood v0.21 is maybe exposing API secrets and financial
  information to a network attacker.

- Paws (aws-sdk-perl) v0.44 is maybe exposing API secrets to a network

- CloudHealth::API v0.01 is maybe exposing API secrets to a network

... and more. We have generated a list of over 300 potentially affected
CPAN distributions.

More info in our blog post:

Stig Palmquist <>

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