GHSA-mx76-r943-rf8g
Bouncy Castle LTS native GCM chunking can cause bad-tag exception on decryption
At a glance
- Published
- Updated
- CVE
- CVE-2026-8149
- CVSS_V4
- 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
Description
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.
Affected packages
| Package | Versions |
|---|---|
| Maven · org.bouncycastle:bcprov-lts8on | introduced 2.73.0, fixed 2.73.11 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-8149 ADVISORY
- https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%908149 WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |