CVE-2026-12817

OpenPGP AEAD decryption skips final tag on chunk-aligned data

State: Published
Severity: 8.7 High
Published: Aug 3, 2026
Updated: Aug 3, 2026
Reserved: Jun 21, 2026

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).

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	bcorg

Weaknesses

CWE-354 Improper Validation of Integrity Check Value

Affected Products

Product	Versions
BC-JAVALegion of the Bouncy Castle Inc.	1.74 to before 1.85Affected
BC-LTS-JAVALegion of the Bouncy Castle Inc.	2.73.0 to before 2.73.12Affected
BC-FJALegion of the Bouncy Castle Inc.	1.0.7 to before 1.0.13Affected 2.0.0 to before 2.0.13Affected 2.1.0 to before 2.1.13Affected

References

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