CVE-2026-8149

GCM chunking can lead to bad tag exception on decryption

MEDIUM

5.1

CVSS Score

Published: May 8, 2026 at 06:01 AM UTC

Updated: October 26, 2026 at 07:10 PM UTC

2 products affected across 1 vendorBouncy Castle for Java FIPS (BC-FJA)Bouncy Castle for Java LTS (BC-LTS)

Using BC-FJA by Legion of the Bouncy Castle Inc.?

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Severity

MEDIUM5.1

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

A vulnerability in Legion of the Bouncy Castle Inc. BC-FJA BC-FIPS on Linux, X86_64, AVX, AVX-512f. This vulnerability is associated with program files gcm128w, gcm512w. This issue affects BC-FJA: from 2.1.0 through 2.1.2.

Affected

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

Bouncy Castle for Java FIPS (BC-FJA)· Legion of Bouncy Castlemaven

90%

2.1.0 ≤ v < 2.1.32.1.0

Affected range stops below 2.1.3, so it looks safe — our inference, not a vendor statement

Bouncy Castle for Java LTS (BC-LTS)· Legion of Bouncy Castlemaven

90%

2.73.0 ≤ v < 2.73.112.73.0

Affected range stops below 2.73.11, 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

https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%908149

References (2)

Source: cverecord

https://do-not-publish.bouncycastle.org/do_not_publish

Vendor Advisory

Source: cverecord

https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%908149

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

5.1MEDIUMbcorg

Vector?

Quick Info

StatusAWAITING ANALYSIS

CWE

CWE-1068

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