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Vulnerability record · CVE-2026-12860 · published 3 August 2026

CVE-2026-12860: Bouncycastle bc-java improper verification of cryptographic signature vulnerability

Bouncycastle · Bc Java

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.

8.7 CVSS 4.0 High EPSS 0.17% · top 94.2% CWE-347 · Improper verification of cryptographic signature
8.7CVSS 4.0 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
2References
28 Aug 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/bcgit/bc-java/commit/ea5970ea9b2fb91d763b904692fd21089ca3e396 Patch
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012860 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-12860), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.