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.
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Affected Vendors & Products
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Workaround
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References
History
Wed, 31 Dec 2025 02:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | CBORDecoder reuse can leak shareable values across decode calls | |
| Weaknesses | CWE-212 | |
| References |
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| Metrics |
cvssV4_0
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2025-12-31T01:15:36.827Z
Reserved: 2025-12-15T18:05:52.210Z
Link: CVE-2025-68131
Vulnrichment
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NVD
Status : Received
Published: 2025-12-31T02:15:42.527
Modified: 2025-12-31T02:15:42.527
Link: CVE-2025-68131
Redhat
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OpenCVE Enrichment
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Weaknesses