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CVE-2023-6245— Infinite decoding loop through specially crafted payload

Quick assessment

Affected
Internet Computer Candid
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Candid是一种接口描述语言 (IDL)，用于与运行在 Internet 计算机上的容器进行交互。 Candid 0.9.0到0.9.10版本存在安全漏洞，该漏洞源于Candid 库在解析具有数据类型的特制有效负载时会导致拒绝服务。

CVSS 7.5 · High EPSS 1.21% · P68

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-6245

Vulnerability Information
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Vulnerability Title
Infinite decoding loop through specially crafted payload
Source: CVE Program / CVE List V5
Vulnerability Description
The Candid library causes a Denial of Service while parsing a specially crafted payload with 'empty' data type. For example, if the payload is `record { * ; empty }` and the canister interface expects `record { * }` then the Rust candid decoder treats empty as an extra field required by the type. The problem with the type empty is that the candid Rust library wrongly categorizes empty as a recoverable error when skipping the field and thus causing an infinite decoding loop. Canisters using affected versions of candid are exposed to denial of service by causing the decoding to run indefinitely until the canister traps due to reaching maximum instruction limit per execution round. Repeated exposure to the payload will result in degraded performance of the canister. Note: Canisters written in Motoko are unaffected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
Candid 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Candid是一种接口描述语言 (IDL)，用于与运行在 Internet 计算机上的容器进行交互。 Candid 0.9.0到0.9.10版本存在安全漏洞，该漏洞源于Candid 库在解析具有数据类型的特制有效负载时会导致拒绝服务。
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
Internet Computer Candid 0.9.0 ~ 0.9.10 -

II. Public POCs for CVE-2023-6245

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9093 chars
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III. Intelligence Information for CVE-2023-6245

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Patches & Fixes for CVE-2023-6245 (1)

Vendor Advisories for CVE-2023-6245 (1)

Other References for CVE-2023-6245 (3)

IV. Related Vulnerabilities

Same vendor: Internet Computer
Same weakness: CWE-835

V. Comments for CVE-2023-6245

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