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EUVD-2026-46051

fkie_cve-2020-26290

Dex is a federated OpenID Connect provider written in Go. In Dex before version 2.27.0 there is a critical set of vulnerabilities which impacts users leveraging the SAML connector. The vulnerabilities enables potential signature bypass due to issues with XML encoding in the underlying Go library. The vulnerabilities have been addressed in version 2.27.0 by using the xml-roundtrip-validator from Mattermost (see related references).

GHSA-m9hp-7r99-94h5 — Critical security issues in XML encoding in github.com/dexidp/dex

Affected: Go: github.com/dexidp/dex, Go: github.com/russellhaering/goxmldsig

### Impact

The following vulnerabilities have been disclosed, which impact users leveraging the SAML connector:

Signature Validation Bypass (CVE-2020-15216): https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7

`encoding/xml` instabilities: - [Element namespace prefix instability (CVE-2020-29511)](https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.md) - [Attribute namespace prefix instability (CVE-2020-29509)](https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md) - [Directive comment instability (CVE-2020-29510)](https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md)

### Patches

Immediately update to [Dex v2.27.0](https://github.com/dexidp/dex/releases/tag/v2.27.0).

### Workarounds

There are no known workarounds.

gsd-2020-26290

openSUSE-SU-2024:10714-1 — dex-oidc-2.28.1-1.3 on GA media

dex-oidc-2.28.1-1.3 on GA media