CVE-2025-68131 (GCVE-0-2025-68131)

Vulnerability from cvelistv5 – Published: 2025-12-31 01:15 – Updated: 2026-01-02 14:37
VLAI?
Title
CBORDecoder reuse can leak shareable values across decode calls
Summary
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 ?
5.5 (Medium)
CVSS: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
CWE
  • CWE-212 - Improper Removal of Sensitive Information Before Storage or Transfer
Assigner
References
Impacted products
Vendor Product Version
agronholm cbor2 Affected: >= 3.0.0, < 5.8.0
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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