CVE-2026-12185: BKS/UBER keystore allocates from untrusted lengths before integrity check

August 3, 2026 (updated September 16, 2026)

Affects Bouncy Castle for Java LTS before 2.73.12. BcKeyStoreSpi.engineLoad() parses every keystore entry before checking the trailing HMAC, and sizes several buffers directly from length fields in the file. A BKS or UBER keystore declaring a length near 2^31 causes a multi-gigabyte allocation and OutOfMemoryError before the integrity check can reject it, stalling or killing the loading process.

References

github.com/bcgit/bc-java/commit/7bbd7fe5f44132e5b6140a2914435c12430eeb3d
github.com/bcgit/bc-java/wiki/CVE-2026-12185
nvd.nist.gov/vuln/detail/CVE-2026-12185

Code Behaviors & Features

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