High severity7.5OSV Advisory· Published Aug 3, 2026· Updated Sep 2, 2026
CVE-2026-12803
CVE-2026-12803
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
6cpe:2.3:a:bouncycastle:bc-java:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:bouncycastle:bc-java:*:*:*:*:*:*:*:*range: <1.85
- (no CPE)range: <1.85, <2.73.12
- cpe:2.3:a:bouncycastle:bouncy_castle_for_java_lts:*:*:*:*:*:*:*:*Range: <=2.73.11
- osv-coords2 versionspkg:rpm/opensuse/bouncycastle&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/bouncycastle&distro=openSUSE%20Tumbleweed
< 1.85-160000.1.1+ 1 more
- (no CPE)range: < 1.85-160000.1.1
- (no CPE)range: < 1.85-1.1
- Range: r2rv73dot11, r2rv73dot10, r2rv73dot9, …
Patches
Vulnerability mechanics
References
2News mentions
2- Bouncy Castle for Java: 25 Vulnerabilities Disclosed Together on August 3, 2026Vypr Intelligence · Aug 3, 2026
- Bouncy Castle for Java: 25 Vulnerabilities Disclosed in Single Batch on August 3, 2026Vypr Intelligence · Aug 3, 2026