Information disclosure in CBOR2 - CVE-2025-68131
Published: November 9, 2026
Vulnerability identifier: #VU162740
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2025-68131
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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).
Affected software
CBOR2
How to mitigate CVE-2025-68131
Install security update from vendor's website.
CBOR2 - update to 5.8.0