CVE-2026-12802 - Vulnerability Details - OpenCVE

In Bouncy Castle for Java before 1.85, CMS AuthEnvelopedData fails to enforce tag-length on decryption. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

No data.

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OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors	Products

References

Link	Providers
https://github.com/bcgit/bc-java/commit/0fefa539e6ac5c66e1daee5a13b23d1d4769cc01
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012802

History

Mon, 03 Aug 2026 06:45:00 +0000

Type	Values Removed	Values Added
References	https://github.com/bcgit/bc-java/wiki/CVE-2026-12802	https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012802

Mon, 03 Aug 2026 04:00:00 +0000

Type	Values Removed	Values Added
Description		In Bouncy Castle for Java before 1.85, CMS AuthEnvelopedData fails to enforce tag-length on decryption. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).
Title		CMS AuthEnvelopedData fails to enforce tag-length on decryption
Weaknesses		CWE-354
References		https://github.com/bcgit/bc-java/commit/0fefa539e6ac5c66e1daee5a13b23d1d4769cc01 https://github.com/bcgit/bc-java/wiki/CVE-2026-12802
Metrics		cvssV4_0 `{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber'}`

MITRE

Status: PUBLISHED

Assigner: bcorg

Published: 2026-08-03T02:48:42.672Z

Updated: 2026-08-03T05:59:51.721Z

Reserved: 2026-06-20T23:07:20.197Z

Link: CVE-2026-12802

Vulnrichment

No data.

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-08-03T09:00:15Z

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