CVE-2026-59638
JSSE hostname verifier CN-fallback enabled by default despite documented opt-in
Description
In Bouncy Castle for Java before 1.85, JSSE hostname verifier CN-fallback enabled by default despite documented opt-in. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bctls-fips 1.0.24 (1.0.X series), 2.0.24 (2.0.X series) and 2.1.24 (2.1.X series).
INFO
Published Date :
Aug. 3, 2026, 1:16 a.m.
Last Modified :
Aug. 3, 2026, 1:16 a.m.
Remotely Exploit :
Yes !
Source :
91579145-5d7b-4cc5-b925-a0262ff19630
Affected Products
The following products are affected by CVE-2026-59638
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | CRITICAL | 91579145-5d7b-4cc5-b925-a0262ff19630 | ||||
| CVSS 4.0 | CRITICAL | 91579145-5d7b-4cc5-b925-a0262ff19630 |
Solution
- Update Bouncy Castle for Java to 1.85 or later.
- Update Bouncy Castle LTS to 2.73.12 or later.
- Update Bouncy Castle FIPS to latest specified versions.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-59638.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-59638 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-59638
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-59638 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-59638 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 91579145-5d7b-4cc5-b925-a0262ff19630
Aug. 03, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/bcgit/bc-java', 'vendor': 'Legion of the Bouncy Castle Inc.', 'modules': ['tls'], 'product': 'BC-JAVA', 'versions': [{'status': 'affected', 'version': '1.61', 'lessThan': '1.85', 'versionType': 'maven'}], 'platforms': ['all'], 'packageURL': 'pkg:maven/org.bouncycastle/bctls-jdk18on', 'packageName': 'bctls', 'programFiles': ['HostnameUtil'], 'collectionURL': 'https://www.bouncycastle.org/download/bouncy-castle-java/', 'defaultStatus': 'unaffected'}, {'repo': 'https://github.com/bcgit/bc-lts-java', 'vendor': 'Legion of the Bouncy Castle Inc.', 'modules': ['tls'], 'product': 'BC-LTS-JAVA', 'versions': [{'status': 'affected', 'version': '2.73.0', 'lessThan': '2.73.12', 'versionType': 'maven'}], 'platforms': ['all'], 'packageURL': 'pkg:maven/org.bouncycastle/bctls-lts8on', 'packageName': 'bctls-lts8on', 'programFiles': ['HostnameUtil'], 'collectionURL': 'https://www.bouncycastle.org/download/bouncy-castle-java-lts/', 'defaultStatus': 'unaffected'}, {'vendor': 'Legion of the Bouncy Castle Inc.', 'product': 'BC-FJA', 'versions': [{'status': 'affected', 'version': '1.0.7', 'lessThan': '1.0.24', 'versionType': 'maven'}, {'status': 'affected', 'version': '2.0.0', 'lessThan': '2.0.24', 'versionType': 'maven'}, {'status': 'affected', 'version': '2.1.0', 'lessThan': '2.1.24', 'versionType': 'maven'}], 'platforms': ['all'], 'packageURL': 'pkg:maven/org.bouncycastle/bctls-fips', 'packageName': 'bctls-fips', 'collectionURL': 'https://www.bouncycastle.org/download/bouncy-castle-java-fips/', 'defaultStatus': 'unaffected'}] Added Description In Bouncy Castle for Java before 1.85, JSSE hostname verifier CN-fallback enabled by default despite documented opt-in. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bctls-fips 1.0.24 (1.0.X series), 2.0.24 (2.0.X series) and 2.1.24 (2.1.X series). Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/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 Added CWE CWE-297 Added Reference https://github.com/bcgit/bc-java/commit/5ac55351cd1a8a7184d41c96a7ee87df0770240a Added Reference https://github.com/bcgit/bc-java/commit/799bd15320a6310a447863638aa3df64acef829b Added Reference https://github.com/bcgit/bc-java/wiki/CVE-2026-59638