PyPI/cbor2 CVE-2026-26209: high 7.5, EPSS 0.40%
cbor2 provides encoding and decoding for the Concise Binary Object Representation (CBOR) serialization format. Versions prior to 5.9.0 are vulnerable to a Denial of Service (DoS) attack caused by unco
Action: Upgrade cbor2 to 5.9.0 or later.
pip install cbor2==5.9.0Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 5.9.0 | - |
Fixed versions
| 5.9.0 |
Sources
- osv: PYSEC-2026-2123
- https://github.com/agronholm/cbor2/releases/tag/5.9.0
- https://github.com/agronholm/cbor2/commit/e61a5f365ba610d5907a0ae1bc72769bba34294b
- https://github.com/agronholm/cbor2/pull/275
- https://github.com/agronholm/cbor2/security/advisories/GHSA-3c37-wwvx-h642
CVE-2026-26209 · published · modified · JSON