https://bugzilla.redhat.com/show_bug.cgi?id=2529748
Bug ID: 2529748
Summary: CVE-2026-72889 perl-Net-OAuth: Net::OAuth:
Authentication bypass via chosen signature algorithm
[epel-all]
Product: Fedora EPEL
Version: epel10
Status: NEW
Whiteboard: {"flaws": ["e02f36e0-8c5d-490e-9571-8ec19456ff24"]}
Component: perl-Net-OAuth
Keywords: Security, SecurityTracking
Severity: urgent
Priority: urgent
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
CC: [email protected], [email protected],
[email protected],
[email protected], [email protected]
Blocks: 2519412 (CVE-2026-72889)
Target Milestone: ---
Classification: Fedora
Disclaimer: Community trackers are created by Red Hat Product Security team on
a best effort basis. Package maintainers are required to ascertain if the flaw
indeed affects their package, before starting the update process.
Net::OAuth versions before 0.33 for Perl allow the sender to choose the
signature algorithm in verify.
verify resolves the signature method class from the signature_method parameter
of the incoming message. signature_method is required on every request, so the
algorithm used to check a signature is chosen by whoever sent it, and nothing
lets the verifying party pin the method instead. When a message names HMAC-SHA1
or HMAC-SHA256, the key is derived from consumer_secret and token_secret rather
than from the key the provider deployed.
A provider deployed on RSA-SHA1 holds only the consumer public key, and RFC
5849 does not use consumer_secret for that method, so the required parameter is
filled with a placeholder. A client that names HMAC-SHA1 instead has its
signature checked against that placeholder, so a guessable one is enough to
forge requests for any consumer key and token.
Referenced Bugs:
https://bugzilla.redhat.com/show_bug.cgi?id=2519412
[Bug 2519412] CVE-2026-72889 Net-OAuth: Net::OAuth: Authentication bypass via
chosen signature algorithm
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