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CVE-2026-5598— Non-constant time comparisons risk private key leakage in FrodoKEM.

Quick assessment

Affected
Legion of the Bouncy Castle Inc. BC-JAVA
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Bouncy Castle Java是Legion of the Bouncy Castle Inc开源的一个加密算法程序。 Bouncy Castle Java 2.17.3至1.84之前版本存在安全漏洞，该漏洞源于非恒定时间比较，可能导致FrodoKEM私钥泄露。

CVSS 8.9 · High EPSS 0.90% · P56

Possible ATT&CK Techniques 1 AI

T1041 · Exfiltration Over C2 Channel

Affected Version Matrix 3

VendorProduct Version RangeStatus
Legion of the Bouncy Castle Inc. BC-JAVA 1.71< 1.80.2 affected
1.81< 1.81.1 affected
1.82< 1.84 affected
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I. Basic Information for CVE-2026-5598

Vulnerability Information
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Vulnerability Title
Non-constant time comparisons risk private key leakage in FrodoKEM.
Source: CVE Program / CVE List V5
Vulnerability Description
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 affects BC-JAVA: from 1.71 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
隐蔽时间通道
Source: CVE Program / CVE List V5
Vulnerability Title
Bouncy Castle Java 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bouncy Castle Java是Legion of the Bouncy Castle Inc开源的一个加密算法程序。 Bouncy Castle Java 2.17.3至1.84之前版本存在安全漏洞，该漏洞源于非恒定时间比较，可能导致FrodoKEM私钥泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Legion of the Bouncy Castle Inc. BC-JAVA 1.71 ~ 1.80.2 -

II. Public POCs for CVE-2026-5598

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III. Intelligence Information for CVE-2026-5598

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Patches & Fixes for CVE-2026-5598 (1)

News Coverage for CVE-2026-5598 (1)

Same Patch Batch · Legion of the Bouncy Castle Inc. · 2026-04-15 · 5 CVEs total

CVE-2025-14813 9.3 CRITICAL GOSTCTR implementation unable to process more than 255 blocks correctly
CVE-2026-3505 8.7 HIGH Unbounded PGP AEAD chunk size leads to pre-auth resource exhaustion.
CVE-2026-5588 6.3 MEDIUM PKIX draft CompositeVerifier accepts empty signature sequence as valid.
CVE-2026-0636 5.5 MEDIUM LDAP Injection Vulnerability in LDAPStoreHelper.java

IV. Related Vulnerabilities

Same product: BC-JAVA
Same vendor: Legion of the Bouncy Castle Inc.
Same weakness: CWE-385

V. Comments for CVE-2026-5598

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