Advisory details:
gitlab / maven/org.bouncycastle/bcprov-jdk14/CVE-2026-12860
| Advisory ID | gitlab/maven/org.bouncycastle/bcprov-jdk14/CVE-2026-12860 |
| Aliases |
CVE-2026-12860
|
| Summary | RSA PKCS#1 verification skips last two hash bytes in NULL-omitted path Affects Bouncy Castle for Java before 1.85. RSADigestSigner.verifySignature() mis-computes the comparison offset in the branch handling DigestInfo encoded without NULL AlgorithmIdentifier parameters, leaving the final two hash bytes unchecked. A signature using that encoding is accepted for any message whose digest matches in all but the last two bytes, reducing second-preimage work by a factor of 2^16. The path is reachable by default from TLS, PKIX, CMS and OpenPGP RSA verification. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 0.0 |
| Risk | |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.bouncycastle/bcprov-jdk14/CVE-2026-12860.yml |
| Reference id | Reference type | URL |
|---|---|---|
| https://github.com/bcgit/bc-java/commit/ea5970ea9b2fb91d763b904692fd21089ca3e396 | ||
| https://github.com/bcgit/bc-java/wiki/CVE-2026-12860 | ||
| CVE-2026-12860 | https://nvd.nist.gov/vuln/detail/CVE-2026-12860 |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
There are no SSVC decisions available.