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Advisory details: github_osv / GHSA-mx76-r943-rf8g
Advisory ID github_osv/GHSA-mx76-r943-rf8g
Aliases CVE-2026-8149
Summary Bouncy Castle LTS native GCM chunking can cause bad-tag exception on decryption In Bouncy Castle LTS for Java, the AES/GCM native implementation used on Intel CPUs with AES PAA instruction sets (AVX / VAES / VAESF variants) can intermittently produce an incorrect authentication tag verification result during decryption when the ciphertext is fed in via a mix of `update()` calls followed by `doFinal()`. It is possible to work around it by either using `doFinal()` only (as the BCJSSE does) or by configuring the module to run in pure Java mode, by setting the system property "org.bouncycastle.native.cpu_variant" to java.
Status Published
Exploitability 0.5
Weighted Severity 4.6
Risk 2.3
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (2)
CWE-354 Improper Validation of Integrity Check Value
CWE-1068 Inconsistency Between Implementation and Documented Design
System Score Found at
cvssv4 5.1 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-mx76-r943-rf8g/GHSA-mx76-r943-rf8g.json
generic_textual MODERATE
Reference id Reference type URL
CVE-2026-8149 https://nvd.nist.gov/vuln/detail/CVE-2026-8149
CVE%E2%80%902026%E2%80%908149 Advisory https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%908149
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
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 Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-mx76-r943-rf8g/GHSA-mx76-r943-rf8g.json
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

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passive

active

high

low

none

high

low

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low

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high

low

none

high

low

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high

low

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There are no SSVC decisions available.