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Bouncy Castle Java CVE-2026-58059

| EUVDEUVD-2026-52092 HIGH
Inefficient Algorithmic Complexity (CWE-407)
2026-08-03 bcorg GHSA-4mwx-9cgq-h2wp
Java Information Disclosure Bc Java Bc Lts Java Bc Fja Suse
8.7
CVSS 4.0 · Vendor: bcorg
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Severity by source

Vendor (bcorg) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber
vuln.today AI
7.5 HIGH

Network-reachable via TLS/LDAP before authentication; no interaction required; pure availability impact with no scope change.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from Vendor (bcorg).

CVSS VectorVendor: bcorg

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 03, 2026 - 03:05 vuln.today
Analysis Generated
Aug 03, 2026 - 03:05 vuln.today
CVE Published
Aug 03, 2026 - 02:41 cve.org
HIGH 8.7

DescriptionCVE.org

In Bouncy Castle for Java before 1.85, Quadratic-time escaping when stringifying X.500 distinguished names. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).

AnalysisAI

CPU exhaustion in Bouncy Castle for Java allows remote attackers to cause denial of service by supplying X.500 distinguished name attribute values densely packed with RFC 4514 special characters or leading/trailing spaces. The root cause is a quadratic-time O(n²) escaping algorithm in IETFUtils.valueToString() that inserts backslashes into the buffer being actively scanned - triggerable through X500Name.toString(), .equals(), or .hashCode(), methods commonly invoked during TLS certificate and LDAP DN processing. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Present crafted TLS cert or LDAP response with special-character-dense RDN
Delivery
Application parses DN into X500Name object
Exploit
Application invokes toString()/equals()/hashCode()
Execution
O(n²) RFC 4514 escaping loop executes in IETFUtils.valueToString()
Persist
Thread stalls consuming CPU core
Impact
Service availability degraded or lost
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Vulnerability AssessmentAI

Exploitation The vulnerable code path in `IETFUtils.valueToString()` is triggered whenever the application calls `X500Name.toString()`, `.equals()`, or `.hashCode()` on an X500Name instance whose attribute value contains a high density of RFC 4514 special characters (comma `,`, double-quote `"`, backslash `\`, plus `+`, equals `=`, angle brackets `<` `>`, semicolon `;`) or many leading or trailing ASCII spaces. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.7 with vector AV:N/AC:L/AT:N/PR:N/UI:N/VA:H reflects a network-reachable, zero-prerequisite denial-of-service path consistent with scenarios where applications parse attacker-controlled TLS certificates or LDAP-sourced distinguished names. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker submits a TLS client certificate whose subject distinguished name contains a single RDN attribute value composed of 100,000 comma characters. The target Java application calls `X500Name.toString()` to log or compare the certificate subject, triggering the O(n²) escaping loop in `IETFUtils.valueToString()`, which performs approximately 5 billion character-copy operations within a single thread. …
Remediation Upgrade bc-java to version 1.85 or later, bc-lts-java to version 2.73.12 or later, and bc-fja to 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series), or 2.1.3 (2.1.X series) or later as applicable. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify and inventory all Java applications and services using Bouncy Castle library and determine their network exposure. …

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Development Tools 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected

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CVE-2026-58059 vulnerability details – vuln.today
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