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CVE-2026-8149— GCM chunking can lead to bad tag exception on decryption

Quick assessment

Affected
Legion of the Bouncy Castle Inc. BC-LTS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Legion of the Bouncy Castle BC-FJA是澳大利亚Legion of the Bouncy Castle公司的一套提供高强度加密算法与安全认证能力的加密库组件。 Legion of the Bouncy Castle BC-FJA存在安全漏洞，该漏洞源于加密计算异常，可能影响数据的机密性或完整性。

AI Predicted 7.5 Difficulty: Hard EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
Legion of the Bouncy Castle Inc. BC-FJA 2.1.0< 2.1.3 affected
Legion of the Bouncy Castle Inc. BC-LTS 2.73.0< 2.73.11 affected
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I. Basic Information for CVE-2026-8149

Vulnerability Information
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Vulnerability Title
GCM chunking can lead to bad tag exception on decryption
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
软件实现和设计文档不一致
Source: CVE Program / CVE List V5
Vulnerability Title
Legion of the Bouncy Castle BC-FJA 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Legion of the Bouncy Castle BC-FJA是澳大利亚Legion of the Bouncy Castle公司的一套提供高强度加密算法与安全认证能力的加密库组件。 Legion of the Bouncy Castle BC-FJA存在安全漏洞，该漏洞源于加密计算异常，可能影响数据的机密性或完整性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Legion of the Bouncy Castle Inc. BC-LTS 2.73.0 ~ 2.73.11 -
Legion of the Bouncy Castle Inc. BC-FJA 2.1.0 ~ 2.1.3 -

II. Public POCs for CVE-2026-8149

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III. Intelligence Information for CVE-2026-8149

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Other References for CVE-2026-8149 (1)

Other References for CVE-2026-8149 (1)

IV. Related Vulnerabilities

Same product: BC-LTS
Same vendor: Legion of the Bouncy Castle Inc.
Same weakness: CWE-1068

V. Comments for CVE-2026-8149

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