Fluid Attacks Database

Description

In Bouncy Castle for Java before 1.85, KCCMBlockCipher MAC does not bind nonce when AAD is absent (cross-nonce AEAD forgery). This issue also affects Bouncy Castle for Java LTS before 2.73.12.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Component	Affected version	Patched versions
maven	org.bouncycastle:bcprov-jdk14	>=0 <1.85.0	1.85.0
maven	org.bouncycastle:bcprov-jdk15to18	>=0 <1.85.0	1.85.0
maven	org.bouncycastle:bcprov-jdk18on	>=0 <1.85.0	1.85.0
maven	org.bouncycastle:bcprov-lts8on	>=2.73.0 <2.73.12	2.73.12
debian 13	bouncycastle	=1.80-3 \|\| =1.86-1	-
debian 14	bouncycastle	=1.80-3 \|\| >=0 <1.86-1	1.86-1
debian 12	bouncycastle	=1.72-2 \|\| =1.77-1 \|\| =1.80-1 \|\| =1.80-2 \|\| =1.80-3 \|\| =1.86-1	-

Aliases

1. CVE-2026-128032. NVD-2026-128033. OSV-2026-128034. OSV-DEBIAN-2026-128035. GCVE-2026-128036. https://github.com/bcgit/bc-java/wiki/CVE-2026-128037. SECURITY-TRACKER-CVE-2026-12803

References

1. https://github.com/bcgit/bc-java/commit/697794413ebf7bc5e3fce609a707826ba52981af2. https://github.com/bcgit/bc-java/commit/7d79aa76e984da85f2a541cae8ba2ae56e1713bc

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