CVE-2026-59647
Description
A flaw was found in Bouncy Castle for Java. The Certificate Request Message Format (CRMF) and Certificate Management Protocol (CMP) password-based Message Authentication Code (MAC) implementation allows for an unbounded iteration count. A remote attacker can exploit this by sending a specially crafted request, leading to a denial of service (DoS) due to excessive resource consumption.
Statement
Bouncy Castle for Java is bundled as a cryptographic provider across numerous Red Hat products. The CRMF/CMP password-based MAC honors an unbounded iteration count, so a crafted request forces excessive computation and a denial of service. Exploitation requires the application to process attacker-supplied CRMF/CMP messages. Note: Red Hat rates this Important (CVSS v3 7.5, A:H) versus the upstream CVEORG v4 score of 6.9 (Moderate, A:L).
Mitigation
Red Hat is not aware of a mitigation for this flaw other than updating the affected Bouncy Castle component to a fixed version (bc-java 1.85, LTS 2.73.12, or BC-FJA bcpkix-fips 1.0.12/2.0.12/2.1.12) once available for the affected product.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU)
Frequently Asked Questions
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