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CVE

CVE-2026-5598

Bouncy Castle Has Covert Timing Channel Vulnerability
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CVE

CVE-2026-5598

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

Package Versions Affected

Package Version
patch Availability
org.bouncycastle:bcprov-jdk18on 1.81
Available
Available by request
org.bouncycastle:bcprov-jdk18on 1.83
Available
Available by request

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.9
-
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:Y/R:X/V:X/RE:X/U:Red
C
H
U
0
-
C
H
U
9.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Related Resources

No items found.

References

https://nvd.nist.gov/vuln/detail/CVE-2026-5598, https://github.com/bcgit/bc-java/commit/8692e6b2b191fc4aafa32545c7a78bdb9bf110c5, https://github.com/bcgit/bc-java/commit/94abbd56413dfdac651fd878bc60253871ef5e87, https://github.com/bcgit/bc-java, https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905598, https://github.com/bcgit/bc-java/wiki/CVE-2026-5598

Severity

9.1

CVSS Score
0
10

Basic Information

Base CVSS
9.1
EPSS Probability
0.00899%
EPSS Percentile
0.57265%
Introduced Version
1.71,0
Fix Available
1.84,1.78.1,2.17.0-r9,2.9.0-r3,4.0.10-r0,4.2.1-r0,8.19.15-r0,9.3.5-r0,36.0.0-r15,7.17.29-r12,8.17.10-r21,8.19.14-r2,9.0.8-r10,9.1.10-r4,9.2.8-r2,9.3.3-r2,2.27.5-r5,2.28.3-r3,12.0.4-r2,8.14.4-r4,9.4.1-r2,2.560-r0,2.555.2-r3,10.1.0.0-r1,9.4.14.0-r5,2025.2.4-r5,2025.4.3-r7,2026.0.2-r7,2025.2.4-r6,2025.4.3-r8,2026.0.2-r8,26.6.1-r4,0.12.0-r31,8.19.16-r0,9.1.10-r8,9.2.8-r4,9.4.4-r0,2.19.6-r0,1.5.0-r21,1.5.0-r11,1.5.0146.1-r8,1.5.0146.1-r6,1.5.0146.1-r7,1.5.0146.1-r3,4.0.2-r11,4.3.1.2-r0,39.0.1-r5,7.3.0-r0,3.6.1-r12

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