DTLS handshake reassembler allocates buffer from unchecked 24-bit length

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-59646
StatePUBLISHED
Assignerbcorg
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-03 01:16:44 UTC
Updated2026-08-03 16:16:29 UTC
DescriptionIn Bouncy Castle for Java before 1.85, DTLS handshake reassembler allocates buffer from unchecked 24-bit length. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bctls-fips 1.0.24 (1.0.X series), 2.0.24 (2.0.X series) and 2.1.24 (2.1.X series).

Risk And Classification

Primary CVSS: v4.0 8.7 HIGH from 91579145-5d7b-4cc5-b925-a0262ff19630

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

Problem Types: CWE-789 | CWE-789 CWE-789 Memory Allocation with Excessive Size Value

VersionSourceTypeScoreSeverityVector
4.091579145-5d7b-4cc5-b925-a0262ff19630Secondary8.7HIGHCVSS: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/C...
4.0CNACVSS8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Amber

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Legion Of The Bouncy Castle Inc. BC-JAVA affected 1.85 maven all
CNA Legion Of The Bouncy Castle Inc. BC-LTS-JAVA affected 2.73.0 2.73.12 maven all
CNA Legion Of The Bouncy Castle Inc. BC-FJA affected 1.0.0 1.0.24 maven all
CNA Legion Of The Bouncy Castle Inc. BC-FJA affected 2.0.0 2.0.24 maven all
CNA Legion Of The Bouncy Castle Inc. BC-FJA affected 2.1.0 2.1.24 maven all

References

ReferenceSourceLinkTags
github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059646 91579145-5d7b-4cc5-b925-a0262ff19630 github.com
github.com/bcgit/bc-java/commit/2d98721e71bbd822ffa0f84e088eea645cf679fa 91579145-5d7b-4cc5-b925-a0262ff19630 github.com
github.com/bcgit/bc-java/commit/2ea38942c7917f6d7ab4de93d8a5336d021df0d9 91579145-5d7b-4cc5-b925-a0262ff19630 github.com
github.com/bcgit/bc-java/wiki/CVE-2026-59646 MITRE github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Alex Gaynor in collaboration with Claude and Anthropic Research (en)

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