CVE-2026-12860

EUVD-2026-52138
In Bouncy Castle for Java before 1.85, RSA PKCS#1 verification skips last two hash bytes in NULL-omitted path. This issue also affects Bouncy Castle for Java LTS before 2.73.12.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 3.94%
Affected Products (NVD)
VendorProductVersion
bouncycastlebc-java
𝑥
< 1.85
bouncycastlebouncy_castle_for_java_lts
𝑥
≤ 2.73.11
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
bouncycastle
bookworm
vulnerable
forky
vulnerable
sid
vulnerable
trixie
vulnerable
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
bouncycastle
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
xenial
needs-triage
Common Weakness Enumeration
References
https://github.com/bcgit/bc-java/commit/ea5970ea9b2fb91d763b904692fd21089ca3e396
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012860