Integer Overflow or Wraparound Affecting bcrypt package, versions <3.1.22
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published20 Mar 2026
- disclosed19 Mar 2026
- creditUnknown
Introduced: 19 Mar 2026
NewCVE-2026-33306 (opens in a new tab)How to fix?
Upgrade bcrypt to version 3.1.22 or higher.
Overview
Affected versions of this package are vulnerable to Integer Overflow or Wraparound in the BCrypt.java implementation when the cost parameter is set to 31. An attacker can significantly reduce the computational effort required to brute-force password hashes by supplying or verifying hashes with a cost of 31, resulting in zero key-strengthening iterations.
Note:
This is only exploitable if the cost parameter is set to 31 or when verifying a hash with the $2a$31$ prefix.