CVE-2026-59649

Name: CVE-2026-59649
Creator: NVD / NIST
Published: 2026-08-03T01:16:45.12+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.28%

Last modified Sep 2, 2026

CVE-2026-59649 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. In Bouncy Castle for Java before 1.85, OpenPGP user-attribute subpacket length bounded only by JVM max memory. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).. EPSS estimates a 0.28% chance of exploitation in the next 30 days.

Description

In Bouncy Castle for Java before 1.85, OpenPGP user-attribute subpacket length bounded only by JVM max memory. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS 4.0

8.7/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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:X/AU:X/R:X/V:X/RE:X/U:Amber

EPSS Probability

0.28%

19.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-789

Affected Software

Vendor	Product	Versions
Bouncycastle	Bc-Java	< 1.85
Bouncycastle	Bcpg-Fips	< 1.0.13
Bouncycastle	Bcpg-Fips	>= 2.0.8, < 2.0.13
Bouncycastle	Bcpg-Fips	>= 2.1.10, < 2.1.13
Bouncycastle	Bouncy Castle For Java Lts	<= 2.73.11

References

https://github.com/bcgit/bc-java/commit/a43c40dc12c3e1c6cbd03c83fe30aaec4029b824Patch
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059649Third Party Advisory, Patch

Timeline

Published: Aug 3, 2026
Last Modified: Sep 2, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-59649?

How severe is CVE-2026-59649?

CVE-2026-59649 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.28% probability of exploitation in the next 30 days.

How do I fix CVE-2026-59649?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST