Vulnerability in Demergent-Labs Azle
CVE-2025-29776
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.
EPSS: 0.003 (27.5th percentile) — read the EPSS interpretation.
Affected products
- Demergent-labs Azle — versions >= 0.27.0, < 0.30.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-29776?
- CVE-2025-29776 is a vulnerability in Demergent-Labs Azle, classified under Loop with Unreachable Exit Condition (Infinite Loop). Published 2025-03-14.
- Is CVE-2025-29776 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.