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Loop with Unreachable Exit Condition ('Infinite Loop') in node-forge

CVE-2026-33891

  • node-forge
  • org.webjars.npm:node-forge
High
7.5/10

Summary

A Denial of Service (DoS) vulnerability exists in the node-forge library due to an infinite loop in the "BigInteger.modInverse()" function (inherited from the bundled jsbn library). When modInverse() is called with a zero value as input, the internal Extended Euclidean Algorithm enters an unreachable exit condition, causing the process to hang indefinitely and consume 100% CPU. The affected versions are prior to 1.4.0.

  • LOW
  • NETWORK
  • NONE
  • UNCHANGED
  • NONE
  • NONE
  • NONE
  • HIGH

CWE-835 - Loop with Unreachable Exit Condition

Loops with multiple exits and flags detract from the quality of an application. They tend to make control structures difficult to understand, and introduce the risk of non-termination and other structural problems. The vulnerability “loop with unreachable exit condition” enables attackers to exploit this flaw, leading to denial of service.

References

Advisory Timeline

  • Published