Search/CVE-2026-12803
● CVE — High

CVE-2026-12803

VendorbouncycastleProductbc-java, bouncy castle for java ltsDiscoveredAug 3, 2026UpdatedSep 2, 2026

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.

View graph Watch Export
CVSS v3.1
7.5 HIGH
EPSS
0.24%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
0
sources referencing this CVE
Related IOCs
0
seen in the same coverage
EPSS Trend
Aug 16, 2026 → Oct 26, 2026
▲ 0.06pp
0.17% → 0.24% over 5 tracked changes
CVSS v3.1 Detail
Attack VectorNETWORK
Attack ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
ScopeUNCHANGED
ConfidentialityNONE
IntegrityHIGH
AvailabilityNONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Connections
3 relationships
Timeline
disclosure → media coverage
Aug 3, 2026
Disclosure — published as a CVE record. · last revised by NVD Sep 2, 2026