Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-p93r-85wp-75v3
Advisory ID github_osv/GHSA-p93r-85wp-75v3
Aliases CVE-2026-5598
Summary Bouncy Castle Has Covert Timing Channel Vulnerability Covert timing channel vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA core on all (core modules). This vulnerability is associated with program files FrodoEngine.Java. This issue only affects users of the FrodoKEM algorithm involved in the decryption of encapsulations. This issue affects BC-JAVA: from 1.71 to 1.80.1, 1.81, 1.82 to 1.83. Fixed versions: 1.80.2, 1.81.1, 1.84
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-385 Covert Timing Channel
System Score Found at
cvssv4 8.9 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-p93r-85wp-75v3/GHSA-p93r-85wp-75v3.json
generic_textual HIGH
Reference id Reference type URL
https://github.com/bcgit/bc-java
https://github.com/bcgit/bc-java/wiki/CVE-2026-5598
8692e6b2b191fc4aafa32545c7a78bdb9bf110c5 Other https://github.com/bcgit/bc-java/commit/8692e6b2b191fc4aafa32545c7a78bdb9bf110c5
94abbd56413dfdac651fd878bc60253871ef5e87 Other https://github.com/bcgit/bc-java/commit/94abbd56413dfdac651fd878bc60253871ef5e87
CVE-2026-5598 https://nvd.nist.gov/vuln/detail/CVE-2026-5598
CVE%E2%80%902026%E2%80%905598 Advisory https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905598
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: 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 Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-p93r-85wp-75v3/GHSA-p93r-85wp-75v3.json
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-04-15T13:11:48Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/5xxx/CVE-2026-5598.json

Source Advisory: vulnrichment/CVE-2026-5598

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'yes'},
 {'Technical Impact': 'total'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]

Vector: SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-04-15T13:11:48Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/5xxx/CVE-2026-5598.json

Source Advisory: vulnrichment/CVE-2026-5598

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'yes'},
 {'Technical Impact': 'total'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]