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Advisory record · GHSA-p93r-85wp-75v3

Bouncy Castle Has Covert Timing Channel Vulnerability

CVSS 8.9 HighEPSS 0.0090 · 59th percentile

Published by the GitHub Advisory Database at 17 Apr 2026, 18:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.bouncycastle:bcprov-jdk15to18Maven>=1.71, <1.80.21.80.2
org.bouncycastle:bcprov-jdk14Maven>=1.71, <1.841.84
org.bouncycastle:bcprov-jdk18onMaven>=1.82, <1.84 || >=1.81, <1.84 || >=1.71, <1.80.21.84, 1.80.2
Identifiers
GHSA-p93r-85wp-75v3 · CVE-2026-5598
Weakness (CWE)
CWE-385
Tags
Published
17 Apr 2026
Updated
4 Nov 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Bouncy Castle packages bcprov-jdk15to18 (versions 1.71 to before 1.80.2), bcprov-jdk14 (1.81 to before 1.81.1), and bcprov-jdk18on (1.82 to before 1.84) contain a covert timing channel in the FrodoKEM decryption of encapsulations. The source gives few details on how the timing leak is exploited. Upgrade to bcprov-jdk15to18 1.80.2, bcprov-jdk14 1.81.1, or bcprov-jdk18on 1.84, depending on the package in use.

Written 2 Nov 2026.

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

ScoreRatingCVSSVectorSource
8.9 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:U/S:P/AU:Y/U:Red CNA (bcorg)
  • CISA KEV Not listed.
  • EPSS 0.0090, the 59th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 17 Apr 2026, 18:31 UTC Confirmed by GitHub Advisory Database
  2. 31 Oct 2026, 14:17 UTC First seen by agentprime
  3. 31 Oct 2026, 14:17 UTC Confirmed by OSV

Sources

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.