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Bouncy Castle Java CVE-2026-14682

| EUVDEUVD-2026-52132 HIGH
Memory Allocation with Excessive Size Value (CWE-789)
2026-08-03 bcorg GHSA-4hc3-69f9-4wfx
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-exploitable with no authentication (PR:N), low complexity, pure availability impact from OOM crash, scope unchanged within the JVM.

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 - 04:21 vuln.today
Analysis Generated
Aug 03, 2026 - 04:21 vuln.today
CVE Published
Aug 03, 2026 - 02:44 cve.org
HIGH 8.7

DescriptionCVE.org

In Bouncy Castle for Java before 1.85, Possible OOM from unbounded up-front allocation on a definite-length read. 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), and before bctls-fips 1.0.24.

AnalysisAI

Out-of-memory denial-of-service in Bouncy Castle for Java allows remote unauthenticated attackers to crash Java applications by submitting a crafted ASN.1 definite-length object with an inflated declared size. The ASN.1 parser in DefiniteLengthInputStream.toByteArray() allocated a full heap-sized byte array before reading any body bytes, meaning a few-byte header claiming a near-JVM-heap payload was sufficient to trigger OOM. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft minimal ASN.1 DER header declaring oversized payload length
Delivery
Send crafted bytes to application accepting untrusted BC-parsed input
Exploit
DefiniteLengthInputStream allocates full declared-size heap buffer
Execution
JVM OutOfMemoryError triggered before body read
Persist
Service thread or JVM crashes
Impact
Availability denied
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target Java application passes attacker-controlled data to Bouncy Castle's ASN.1 parser - specifically `ASN1InputStream` or any higher-level consumer such as `X509CertificateHolder`, CMS parsers, or PKCS decoders. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.7 with AV:N/AC:L/AT:N/PR:N/UI:N/VA:H is consistent with the technical reality: any application passing network-supplied data to Bouncy Castle's ASN.1 parser is potentially exploitable with no authentication, user interaction, or complex preconditions required. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker submits a 5-byte crafted DER-encoded OCTET STRING header to a Java web service that passes uploads to Bouncy Castle's `ASN1InputStream` - for example, a certificate upload endpoint or a CMS signature verification API. The header declares a near-JVM-heap payload length (e.g., 0x7FFFFFFF bytes) with no accompanying body bytes; the unpatched parser immediately calls `new byte[2_147_483_647]` before reading any data, triggering a JVM OutOfMemoryError that crashes the service thread or the entire JVM. …
Remediation The primary fix is to upgrade to a patched release: bc-java 1.85 or later, bc-lts-java 2.73.12 or later, bc-fips 1.0.2.7 for the 1.0.X series or 2.0.2 for the 2.0.X series or 2.1.3 for the 2.1.X series, and bctls-fips 1.0.24 or later. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all Java applications using Bouncy Castle through dependency scanning and procurement records. …

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
openSUSE Leap 16.0 Fixed
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected

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CVE-2026-14682 vulnerability details – vuln.today
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