Allocation of Resources Without Limits or Throttling Affecting org.bouncycastle:bcpkix-lts8on package, versions [,2.73.12)
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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- published4 Aug 2026
- disclosed3 Aug 2026
- creditUnknown
Introduced: 3 Aug 2026
NewCVE-2026-59647 (opens in a new tab)How to fix?
Upgrade org.bouncycastle:bcpkix-lts8on to version 2.73.12 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the PKMACValueVerifier.isValid() and ProtectedPKIMessage.verify() verification paths, where PKMACBuilder's default constructor leaves maxIterations = 0 and disables the iteration-count ceiling, so an attacker-supplied PBMParameter iteration count drives the do { K = digest(K); } while (--iter > 0); loop without bound. An attacker can tie up a server thread for hours per request and exhaust the thread pool with a handful of requests by setting iterationCount to 2^31-1 in a password-MAC protected CMP or CRMF message. This affects endpoints that verify PBM-protected CMP/CRMF messages, or CMS PasswordRecipientInfo via BcPasswordRecipient, using a PKMACBuilder left at its default with no iteration ceiling, such as CAs and RAs.