Is cbor2 affected by CVE-2026-26209?

PyPI cbor2 is affected in <5.9.0.

Is CVE-2026-26209 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

high

CVE-2026-26209

Q: Is CVE-2026-26209 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

PyPI · cbor2

Summary

cbor2 has a Denial of Service via Uncontrolled Recursion in cbor2.loads

Severity: high
EPSS: 0.4% (p33)
Also known as: GHSA-3c37-wwvx-h642
Published: 2026-03-23

References

https://github.com/agronholm/cbor2/security/advisories/GHSA-3c37-wwvx-h642
https://nvd.nist.gov/vuln/detail/CVE-2026-26209
https://github.com/agronholm/cbor2/pull/275

Related advisories

CVE-2025-68131 — medium · PyPI/cbor2

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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.