Is league/commonmark affected by CVE-2026-33347?

Packagist league/commonmark is affected in >=2.3.0 <2.8.2.

Is CVE-2026-33347 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

medium

CVE-2026-33347

Q: Is CVE-2026-33347 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

Packagist · league/commonmark

Summary

league/commonmark has an embed extension allowed_domains bypass

Severity: medium
EPSS: 0.2% (p15)
Also known as: GHSA-hh8v-hgvp-g3f5
Published: 2026-03-19

References

https://github.com/thephpleague/commonmark/security/advisories/GHSA-hh8v-hgvp-g3f5
https://nvd.nist.gov/vuln/detail/CVE-2026-33347
https://github.com/thephpleague/commonmark/commit/59fb075d2101740c337c7216e3f32b36c204218b

Related advisories

GHSA-c2pc-g5qf-rfrf — high · Packagist/league/commonmark
CVE-2026-30838 — medium · Packagist/league/commonmark
CVE-2025-46734 — medium · Packagist/league/commonmark

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.