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Bouncy Castle Java EUVDEUVD-2026-52091

| CVE-2026-58060 HIGH
Memory Allocation with Excessive Size Value (CWE-789)
2026-08-03 bcorg GHSA-3q78-fqj5-g3mc
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 unauthenticated parsing path, no scope change, and exclusively availability impact via unbounded heap allocation; no confidentiality or integrity effect.

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 - 03:01 vuln.today
Analysis Generated
Aug 03, 2026 - 03:01 vuln.today
CVE Published
Aug 03, 2026 - 02:37 cve.org
HIGH 8.7

DescriptionCVE.org

In Bouncy Castle for Java before 1.85, HSS public-key level count unbounded, enabling huge allocation on verify. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).

AnalysisAI

Uncontrolled memory allocation in Bouncy Castle for Java's HSS public-key parser allows remote unauthenticated attackers to exhaust JVM heap memory by supplying a crafted public key with an arbitrarily large HSS level count (L value), causing denial of service during signature verification. All three product lines are affected: bc-java before 1.85, bc-lts-java before 2.73.12, and BC-FIPS (bc-fja) before 2.0.2/2.1.3 depending on series. …

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Attack ChainAIDerived

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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target application uses a vulnerable version of bc-java (before 1.85), bc-lts-java (before 2.73.12), or bc-fja (before 2.0.2 or 2.1.3), AND that the application parses or verifies HSS/LMS public keys sourced from attacker-controlled input - such as an API accepting PEM/DER-encoded post-quantum keys, a TLS stack validating HSS-based certificates, or any deserialization path that reaches HSSPublicKeyParameters.getInstance(). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N, score 8.7) describes a remotely exploitable, low-complexity, unauthenticated denial-of-service with no confidentiality or integrity impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to the patched releases: bc-java 1.85 or later, bc-lts-java 2.73.12 or later, bc-fja 2.0.2 (for 2.0.X deployments) or 2.1.3 (for 2.1.X deployments). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, audit your infrastructure to identify applications using Bouncy Castle (bc-java, bc-lts-java, or BC-FIPS) and whether they accept external cryptographic keys for HSS/LMS signature verification. …

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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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EUVD-2026-52091 vulnerability details – vuln.today
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