CVE-2025-68131

MEDIUM EPSS 33.9%
Published Dec 31, 20256mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 4.0
Medium
Find Similar
Published Dec 31, 2025 6mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.5
Exploitability
—
Impact
—
Vector string
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
33.9% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-212

Affected Products 1

VendorProductVersionRange
agronholmcbor2*≥3.0.0  –  <5.8.0

References 2

  • github.com https://github.com/agronholm/cbor2/pull/268
    ExploitPatch
  • github.com https://github.com/agronholm/cbor2/security/advisories/GHSA-wcj4-jw5j-44wh
    ExploitVendor Advisory

Remediation

  • github.com https://github.com/agronholm/cbor2/pull/268
    ExploitPatch