Vulnerability · Published Mar 14, 2025 · Assigned by GitHub_M

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

High 8.7

In plain English

A high-severity infinite loop in azle from demergent-labs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)0.4%top 68.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	azle	0.30.0	GHSA-xc76-5pf9-mx8m

Affected products (as reported)

Vendor	Product	Versions
demergent-labs	azle	>= 0.27.0, < 0.30.0

Weakness: CWE-835 · Vector: 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

References

https://github.com/demergent-labs/azle/security/advisories/GHSA-xc76-5pf9-mx8m x_refsource_CONFIRM
https://github.com/demergent-labs/azle/releases/tag/0.30.0 x_refsource_MISC