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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.

PUBLISHED Reserved 2025-12-15 | Published 2025-12-31 | Updated 2025-12-31 | Assigner GitHub_M




MEDIUM: 5.5CVSS: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:P

Problem types

CWE-212: Improper Removal of Sensitive Information Before Storage or Transfer

Product status

>= 3.0.0, < 5.8.0
affected

References

github.com/.../cbor2/security/advisories/GHSA-wcj4-jw5j-44wh

github.com/agronholm/cbor2/pull/268

cve.org (CVE-2025-68131)

nvd.nist.gov (CVE-2025-68131)

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Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.