Symbolic name not mapping to correct class.
BCEL caches attacker-controlled classes under their self-declared names without validating the requested name, allowing subsequent lookups and name-keyed verification results to refer to a different class.
This issue affects Apache Commons BCEL: before 6.13.0.
Users are recommended to upgrade to version 6.13.0, which fixes the issue.
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Apache Commons BCEL.
This only happens when you're using Class2HTML to generate webpages for possibly-attacker-controlled class files, where Class2HTML emitters write attacker class-file strings into HTML unescaped (stored XSS in reports).
This issue affects Apache Commons BCEL: before 6.13.0.
Users are recommended to upgrade to version 6.13.0, which fixes the issue.
Severity: important CVSS 3.1: 5.9 (medium) CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS 4.0: 8.2 (high) CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Affected versions:
- Apache Commons BCEL before 6.13.0 - Apache Commons BCEL before 14890bf2b9014df25f9b4de86f29b5e917e5656b
Description:
Symbolic name not mapping to correct object vulnerability in Apache Commons.
BCEL caches attacker-controlled classes under their self-declared names without validating the requested name, allowing subsequent lookups and name-keyed verification results to refer to a different class.
This issue affects Apache Commons: before 6.13.0.
Users are recommended to upgrade to version 6.13.0, which fixes the issue.
Credit:
The Apache Software Foundation (finder) Claude Security (tool)
References:
https://github.com/apache/commons-bcel/commit/14890bf2b9014df25f9b4de86f29b5e917e5656b.patch https://commons.apache.org/ https://www.cve.org/CVERecord?id=CVE-2026-94114
Severity: low CVSS 3.1: 4.7 (medium) CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS 4.0: 2.3 (low) CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Affected versions:
- Apache Commons BCEL before 6.13.0 - Apache Commons BCEL before fb72c225cbc6ec3d94060ed6edb269f07428d504
Description:
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Apache Commons BCEL.
This only happens when you're using Class2HTML to generate webpages for possibly-attacker-controlled class files, where Class2HTML emitters write attacker class-file strings into HTML unescaped (stored XSS in reports).
This issue affects Apache Commons BCEL: before 6.13.0.
Users are recommended to upgrade to version 6.13.0, which fixes the issue.
Credit:
The Apache Software Foundation (finder) Claude Security (tool)
References:
https://github.com/apache/commons-bcel/commit/fb72c225cbc6ec3d94060ed6edb269f07428d504.patch https://commons.apache.org/ https://www.cve.org/CVERecord?id=CVE-2026-105111
Security Fix(es): mtr-web-container: Apache-Commons-BCEL: arbitrary bytecode produced via out-of-bounds writing (CVE-2022-42920) For more details about the security issue(s), including the impact, a CVSSscore, acknowledgments, and other related information, refer to the CVEpage listed in the References section.
An out-of-bounds (OOB) write flaw was found in Apache Commons BCEL API. This flaw can be used to produce arbitrary bytecode and may abuse applications that pass attacker-controlled data to those APIs, giving the attacker more control over the resulting bytecode than otherwise expected.