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GO-2026-6909

Published Nov 5, 2026·Last modified Nov 5, 2026
Affected Components(0)

No affected components available

Description

github.com/crewjam/saml through v0.5.1 contains two vulnerabilities in SAML assertion processing:

  1. ServiceProvider.validateAssertion dereferences assertion.Issuer without a nil check when ExpectedIDPEntityID is non-empty. A signed SAML assertion that omits the optional saml:Issuer element causes a nil-pointer dereference panic after signature verification.

  2. Subject uses the bare XML struct tag xml:"NameID", which matches <NameID> elements in any XML namespace. When a signed assertion omits saml:NameID and includes a <NameID> element in a foreign namespace inside saml:Subject, encoding/xml populates Subject.NameID from the foreign element, allowing an authenticated principal to spoof Subject.NameID.Value.

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Risk Scores
Base Score
-1.0

Measures severity based on intrinsic characteristics of the vulnerability, independent of environment.

Threat Intelligence
-1.0

No exploitation activity has been observed at this time. Continue routine monitoring.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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