CVE-2026-12860

Medium

Description

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.

SeverityMedium

CVSS5.3

Exploit probability—

ProductBouncycastle Bouncy Castle For Java Lts

PublishedAug 3, 2026

First seenAug 3, 2026

Weakness typeCWE-347CWE-347

How to fix

Update

bouncycastle bc-java1.85 or later

Patches

github.com/bcgit/bc-java/commit/ea5970ea9b2fb91d763b904692fd21089ca3e396

Vendor advisories

github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012860

Affected products

Product	Affected versions	Fixed in
bouncycastle bouncy_castle_for_java_lts	v ≤ 2.73.11	—
bouncycastle bc-java	v < 1.85	1.85

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