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CVE-2025-68131— CBORDecoder reuse can leak shareable values across decode calls

Quick assessment

Affected
agronholm cbor2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

cbor2是Alex Grönholm个人开发者的一个具有广泛标签支持的二进制对象表示序列化格式编码和解码的库。 cbor2 3.0.0版本至5.8.0之前版本存在安全漏洞，该漏洞源于跨信任边界重用解码器时，可共享标记的值会保留在内存中，可能导致攻击者读取先前解码消息中的数据。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.46% · P40

Possible ATT&CK Techniques 1 AI

T1115 · Clipboard Data
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I. Basic Information for CVE-2025-68131

Vulnerability Information
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Vulnerability Title
CBORDecoder reuse can leak shareable values across decode calls
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的不恰当跨边界移除
Source: CVE Program / CVE List V5
Vulnerability Title
cbor2 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cbor2是Alex Grönholm个人开发者的一个具有广泛标签支持的二进制对象表示序列化格式编码和解码的库。 cbor2 3.0.0版本至5.8.0之前版本存在安全漏洞，该漏洞源于跨信任边界重用解码器时，可共享标记的值会保留在内存中，可能导致攻击者读取先前解码消息中的数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
agronholm cbor2 >= 3.0.0, < 5.8.0 -

II. Public POCs for CVE-2025-68131

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III. Intelligence Information for CVE-2025-68131

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Patches & Fixes for CVE-2025-68131 (1)

Vendor Advisories for CVE-2025-68131 (1)

IV. Related Vulnerabilities

Same product: cbor2
Same vendor: agronholm
Same weakness: CWE-212