Critical security issues in XML encoding in github.com/dexidp/dex

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.017, the 77th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 14:45 UTC First seen by agentprime
2. 31 Oct 2026, 14:45 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-m9hp-7r99-94h5
• OSV: GHSA-m9hp-7r99-94h5
• github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5
• github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7
• nvd.nist.gov/vuln/detail/CVE-2020-26290
• github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8
• github.com/russellhaering/goxmldsig/commit/f6188febf0c29d7ffe26a0436212b19cb9615e64
• github.com/dexidp/dex/releases/tag/v2.27.0
• github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md
• github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md
• github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.md
• mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities
• pkg.go.dev/vuln/GO-2020-0050

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.