Bouncy Castle affected by timing side-channel for RSA key exchange ("The Marvin Attack")

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0090, the 60th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 14:17 UTC First seen by agentprime
2. 31 Oct 2026, 14:17 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-v435-xc8x-wvr9
• OSV: GHSA-v435-xc8x-wvr9
• nvd.nist.gov/vuln/detail/CVE-2024-30171
• github.com/bcgit/bc-csharp/commit/c984b8bfd8544dfc55dba91a02cbbbb9c580c217
• github.com/bcgit/bc-java/commit/d7d5e735abd64bf0f413f54fd9e495fc02400fb0
• github.com/bcgit/bc-java/commit/e0569dcb1dea9d421d84fc4c5c5688fe101afa2d
• github.com/bcgit/bc-csharp/wiki/CVE%E2%80%902024%E2%80%9030171
• github.com/bcgit/bc-java/wiki/CVE%E2%80%902024%E2%80%9030171
• security.netapp.com/advisory/ntap-20240614-0008
• www.bouncycastle.org/latest_releases.html

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.