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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache Commons BCEL | < 6.13.0 | 6.13.0 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | bcel | 6.13.0-1 | — |
| Debian 13 | bcel | No fix yet | — |
| Debian 12 | bcel | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | bcel +7 | No fix yet | — |
| Ubuntu 26.04 LTS | bcel +7 | No fix yet | — |
| Ubuntu 24.04 LTS | bcel +4 | No fix yet | — |
| Ubuntu 22.04 LTS | bcel +6 | No fix yet | — |
| Ubuntu 20.04 LTS | openjdk-13 +1 | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | openjdk-9 | No fix yet | — |
| Ubuntu Pro 24.04 LTS | openjdk-lts | No fix yet | — |
| Ubuntu Pro 20.04 LTS | bcel +4 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | bcel +3 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | bcel +1 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | bcel | 6.13.0-150200.11.9.1 | SUSE-SU-2026:5199-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | bcel | 6.13.0-160000.1.1 | SUSE-SU-2026:24258-1 |
| SLES 16.0 | bcel | 6.13.0-160000.1.1 | SUSE-SU-2026:24258-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | bcel | 6.13.0-1.1 | openSUSE-SU-2026:12080-1 |
| openSUSE Leap 16.0 | bcel | 6.13.0-160000.1.1 | openSUSE-SU-2026:22109-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | bcel | 6.13.0-1.amzn2023.0.1 | ALAS2023-2026-3422 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | bcel | No fix yet | — |
Advisories 6
- SUSE-SU-2026:5199-1 Security update for bcel SUSE / openSUSE Security Updates · Nov 12, 2026
- ALAS2023-2026-3422 Moderate: bcel security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 12, 2026
- WID-SEC-2026-3778 Apache Commons BCEL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- SUSE-SU-2026:24258-1 Security update for bcel SUSE / openSUSE Security Updates · Oct 23, 2026
- openSUSE-SU-2026:22109-1 Security update for bcel SUSE / openSUSE Security Updates · Oct 19, 2026
- openSUSE-SU-2026:12080-1 bcel-6.13.0-1.1 on GA media SUSE / openSUSE Security Updates · Oct 9, 2026