CVE-2025-68131

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published12/31/2025

Last Modified1/2/2026

Sourcenvd

Honeypot Sightings0

Affected Products

agronholm:cbor2

Weaknesses (CWE)

CWE-212

References

https://github.com/agronholm/cbor2/pull/268(security-advisories@github.com)

https://github.com/agronholm/cbor2/security/advisories/GHSA-wcj4-jw5j-44wh(security-advisories@github.com)

https://github.com/agronholm/cbor2/security/advisories/GHSA-wcj4-jw5j-44wh(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.