CVSS 4.0
5.5 mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:PCVE-2025-68131
Medium (5.5) in agronholm cbor2. EPSS 0.5% chance of exploitation in the next 30 days. Fixed in cbor2 5.8.0.
cbor2 provides encoding and decoding for the Concise Binary Object Representation (CBOR) serialization format. Starting in version 3.0.0 and prior to version 5.8.0, whhen a CBORDecoder instance is reused across multiple decode operations, values marked with the shareable tag (28) persist in memory and can be accessed by subsequent CBOR messages using the sharedref tag (29). This allows an attacker-controlled message to read data from previously decoded messages if the decoder is reused across trust boundaries. Version 5.8.0 patches the issue.
Severity
CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N- EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 39% of CVEs (scores of 2026-10-31)
- CWE
- CWE-212
- Published
- Modified
- Record from
- the NVD, synced
Affected
- agronholm:cbor2
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-wcj4-jw5j-44wh | PyPI | cbor2 | >=3.0.0 <5.8.0 | 5.8.0 |
| PYSEC-2025-90 | PyPI | cbor2 | >=3.0.0 <5.8.0 | 5.8.0 |