SB2026110976 - Information disclosure in CBOR2

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Main Vulnerability Database SB2026110976

SB2026110976 - Information disclosure in CBOR2

Published: November 9, 2026

Security Bulletin ID SB2026110976
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Information disclosure (CVE-ID: CVE-2025-68131)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows an unauthenticated attacker to read shareable values from previously decoded trusted CBOR messages.

The vulnerability exists due to retained value-sharing state in CBOR2's CBORDecoder when the same instance decodes separate messages across trust boundaries. An unauthenticated attacker can submit a crafted message containing a shared reference tag (29) to retrieve data retained from an earlier trusted message containing a shareable tag (28).


Remediation

Install update from vendor's website.

References