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CVE-2025-29776— Azle calling `setTimer` causes infinite loop of timers

Quick assessment

Affected
demergent-labs azle
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.

Azle是Demergent开源的一个 ICP 上 TypeScript 和 JavaScript 的 WebAssembly 运行时。 Azle 0.27.0版本、0.28.0版本和0.29.0版本存在安全漏洞，该漏洞源于调用setTimer可能导致无限循环。

AI Predicted 5.5 Difficulty: Easy EPSS 0.38% · P30
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I. Basic Information for CVE-2025-29776

Vulnerability Information
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Vulnerability Title
Azle calling `setTimer` causes infinite loop of timers
Source: CVE Program / CVE List V5
Vulnerability Description
Azle is a WebAssembly runtime for TypeScript and JavaScript on ICP. Calling `setTimer` in Azle versions `0.27.0`, `0.28.0`, and `0.29.0` causes an immediate infinite loop of timers to be executed on the canister, each timer attempting to clean up the global state of the previous timer. The infinite loop will occur with any valid invocation of `setTimer`. The problem has been fixed as of Azle version `0.30.0`. As a workaround, if a canister is caught in this infinite loop after calling `setTimer`, the canister can be upgraded and the timers will all be cleared, thus ending the loop.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
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
Azle 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Azle是Demergent开源的一个 ICP 上 TypeScript 和 JavaScript 的 WebAssembly 运行时。 Azle 0.27.0版本、0.28.0版本和0.29.0版本存在安全漏洞，该漏洞源于调用setTimer可能导致无限循环。
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
demergent-labs azle >= 0.27.0, < 0.30.0 -

II. Public POCs for CVE-2025-29776

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III. Intelligence Information for CVE-2025-29776

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Other References for CVE-2025-29776 (1)

IV. Related Vulnerabilities

Same weakness: CWE-835

V. Comments for CVE-2025-29776

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