CVE-2026-12817 - Vulnerability Details - OpenCVE

In Bouncy Castle for Java before 1.85, OpenPGP AEAD decryption skips final tag on chunk-aligned data. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (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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References

Link	Providers
https://github.com/bcgit/bc-java/commit/4b712819846ec944379f4909101abac20f0ad4b0
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012817

History

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

Type	Values Removed	Values Added
References	https://github.com/bcgit/bc-java/wiki/CVE-2026-12817	https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012817

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

Type	Values Removed	Values Added
Description		In Bouncy Castle for Java before 1.85, OpenPGP AEAD decryption skips final tag on chunk-aligned data. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).
Title		OpenPGP AEAD decryption skips final tag on chunk-aligned data
Weaknesses		CWE-354
References		https://github.com/bcgit/bc-java/commit/4b712819846ec944379f4909101abac20f0ad4b0 https://github.com/bcgit/bc-java/wiki/CVE-2026-12817
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: 2026-08-03T02:54:16.880Z

Updated: 2026-08-03T05:57:33.979Z

Reserved: 2026-06-21T08:58:04.722Z

Link: CVE-2026-12817

Vulnrichment

No data.

NVD

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Redhat

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OpenCVE Enrichment

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