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CVE-2026-12817

OpenPGP AEAD decryption skips final tag on chunk-aligned data

HIGH
8.6
CVSS Score
Published: August 3, 2026 at 02:54 AM UTC
Updated: August 31, 2026 at 03:16 PM UTC
5 products affected across 2 vendorsBc JavaBouncy Castle for Java LtsBcpg Fips

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Severity
HIGH8.6
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Bc Java· Bouncycastle
95%
v < 1.85
Bcpg Fips· Bouncycastle
95%
1.0.7 ≤ v < 1.0.132.0.8 ≤ v < 2.0.132.1.10 ≤ v < 2.1.13
Bouncy Castle for Java Lts· Bouncycastle
95%
v ≤ 2.73.11
Bouncy Castle for Java FIPS (BC-FJA)· Legion of Bouncy Castlemaven
60%
1.0.7 ≤ v < 1.0.132.0.0 ≤ v < 2.0.132.1.0 ≤ v < 2.1.131.0.72.0.02.1.0
Affected range stops below 1.0.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.0.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.1.13, so it looks safe — our inference, not a vendor statement
BC Java· Legion of Bouncy Castlemaven
60%
1.74 ≤ v < 1.852.73.0 ≤ v < 2.73.121.742.73.0
Affected range stops below 1.85, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.73.12, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Source: cverecord
https://github.com/bcgit/bc-java/wiki/CVE-2026-12817
Patch
Source: cverecord
https://github.com/bcgit/bc-java/commit/4b712819846ec944379f4909101abac20f0ad4b0
Vendor AdvisoryThird Party Advisory
Source: cverecord
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012817

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.6HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-354

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