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Vulnerability Details :

CVE-2026-8149

Summary
Assigner-bcorg
Assigner Org ID-91579145-5d7b-4cc5-b925-a0262ff19630
Published At-08 May, 2026 | 06:01
Updated At-21 Jul, 2026 | 04:59
Rejected At-
Credits

GCM chunking can lead to bad tag exception on decryption

A vulnerability in Legion of the Bouncy Castle Inc. BC-LTS bcprov-lts8on on X86_64, AVX, AVX-512f, Linux, 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, gcm128w.C, gcm512w.C. This issue affects BC-LTS: from 2.73.0 before 2.73.11; BC-FJA: from 2.1.0 before 2.1.3.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:bcorg
Assigner Org ID:91579145-5d7b-4cc5-b925-a0262ff19630
Published At:08 May, 2026 | 06:01
Updated At:21 Jul, 2026 | 04:59
Rejected At:
▼CVE Numbering Authority (CNA)
GCM chunking can lead to bad tag exception on decryption

A vulnerability in Legion of the Bouncy Castle Inc. BC-LTS bcprov-lts8on on X86_64, AVX, AVX-512f, Linux, 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, gcm128w.C, gcm512w.C. This issue affects BC-LTS: from 2.73.0 before 2.73.11; BC-FJA: from 2.1.0 before 2.1.3.

Affected Products
Vendor
Legion of the Bouncy Castle Inc.
Product
BC-LTS
Collection URL
https://www.bouncycastle.org/download/bouncy-castle-java-fips/
Package Name
bcprov-lts8on
Repo
https://repo1.maven.org/maven2/org/bouncycastle/bcprov-lts18on
Program Files
  • gcm128w
  • gcm512w
Platforms
  • X86_64
  • AVX
  • AVX-512f
  • Linux
Default Status
unaffected
Versions
Affected
  • From 2.73.0 before 2.73.11 (maven)
Vendor
Legion of the Bouncy Castle Inc.
Product
BC-FJA
Collection URL
https://www.bouncycastle.org/download/bouncy-castle-java-fips/
Package Name
bc-fips
Repo
https://repo1.maven.org/maven2/org/bouncycastle/bc-fips
Program Files
  • gcm128w.c
  • gcm512w.c
Platforms
  • Linux
  • X86_64
  • AVX
  • AVX-512f
Default Status
unaffected
Versions
Affected
  • From 2.1.0 before 2.1.3 (maven)
Problem Types
TypeCWE IDDescription
CWECWE-1068CWE-1068
Type: CWE
CWE ID: CWE-1068
Description: CWE-1068
Metrics
VersionBase scoreBase severityVector
4.05.1MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/S:N/RE:M/U:Amber
Version: 4.0
Base score: 5.1
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/S:N/RE:M/U:Amber
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds

If possible pass whole message to GCM via doFinal(..) for decryption. Issue only occurs when decryption is chunked at certain boundaries.

Exploits
Credits
finder
Michael Schäfer, Kiteworks
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%908149
vendor-advisory
Hyperlink: https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%908149
Resource:
vendor-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:91579145-5d7b-4cc5-b925-a0262ff19630
Published At:08 May, 2026 | 07:16
Updated At:21 Jul, 2026 | 06:16

A vulnerability in Legion of the Bouncy Castle Inc. BC-LTS bcprov-lts8on on X86_64, AVX, AVX-512f, Linux, 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, gcm128w.C, gcm512w.C. This issue affects BC-LTS: from 2.73.0 before 2.73.11; BC-FJA: from 2.1.0 before 2.1.3.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.05.1MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:X/R:X/V:X/RE:M/U:Amber
N/A
Type: Secondary
Version: 4.0
Base score: 5.1
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:X/R:X/V:X/RE:M/U:Amber
Type: N/A
Version:
Base score:
Base severity: N/A
Vector:
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-1068Secondary91579145-5d7b-4cc5-b925-a0262ff19630
CWE ID: CWE-1068
Type: Secondary
Source: 91579145-5d7b-4cc5-b925-a0262ff19630
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%90814991579145-5d7b-4cc5-b925-a0262ff19630
N/A
Hyperlink: https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%908149
Source: 91579145-5d7b-4cc5-b925-a0262ff19630
Resource: N/A

Change History

0
Information is not available yet

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