Description
A mutation XSS affects users calling bleach.clean with all of: svg or math in the allowed tags p or br in allowed tags style, title, noscript, script, textarea, noframes, iframe, or xmp in allowed tags the keyword argument strip_comments=False Note: none of the above tags are in the default allowed tags and strip_comments defaults to True.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Mozilla Bleach | unspecified – < 3.3.0 | 3.3.0 |
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 | python-bleach | 3.2.1-2.1 | — |
| Debian 13 | python-bleach | 3.2.1-2.1 | — |
| Debian 12 | python-bleach | 3.2.1-2.1 | — |
| Debian 10 | python-bleach | 3.1.2-0+deb10u2 | DSA-4892-1 |
| Debian 9 | python-bleach | 2.0-1+deb9u1 | DLA-2620-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | python-bleach | 3.1.1-1ubuntu0.1~esm1 | — |
| Ubuntu Pro 18.04 LTS | python-bleach | 2.1.2-1ubuntu0.1~esm1 | — |
| Ubuntu Pro 16.04 LTS | python-bleach | 1.4.2-1ubuntu0.1~esm1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Ansible Automation Platform 4 | automation-hub +2 | 4.2.2-1.el7pc | RHSA-2021:0781 |
| Red Hat Ansible Automation Platform 4 | python-bleach +1 | 3.3.0-1.el7pc | RHSA-2021:0781 |
| Red Hat Ansible Automation Platform 4 | python-bleach-allowlist +1 | 1.0.3-1.el7pc | RHSA-2021:0781 |
| Red Hat Ansible Automation Platform 4 | python-galaxy-importer +1 | 0.2.15-1.el7pc | RHSA-2021:0781 |
| Red Hat Ansible Automation Platform 4 | python-pulp-ansible +1 | 1:0.5.6-1.el7pc | RHSA-2021:0781 |
| Red Hat Ansible Automation Platform 4 | python3-django | 2.2.18-1.el7pc | RHSA-2021:0781 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP2 | python-bleach | 3.1.5-bp152.2.4.1 | openSUSE-SU-2021:0571-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python-bleach | 6.1.0-1.5 | openSUSE-SU-2026:11323-1, openSUSE-SU-2024:14134-1 |
| openSUSE Leap 15.2 | python-bleach | 3.1.5-lp152.2.3.1 | openSUSE-SU-2021:0552-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | py3-bleach | 3.3.0-r0 | — |
| Alpine v3.23 | py3-bleach | 3.3.0-r0 | — |
| Alpine v3.22 | py3-bleach | 3.3.0-r0 | — |
| Alpine v3.21 | py3-bleach | 3.3.0-r0 | — |
| Alpine v3.20 | py3-bleach | 3.3.0-r0 | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | py3-bleach | 3.3.0-r0 | — |
| Alpine v3.18 | py3-bleach | 3.3.0-r0 | — |
| Alpine v3.17 | py3-bleach | 3.3.0-r0 | — |
| Alpine v3.16 | py3-bleach | 3.3.0-r0 | — |
| Alpine v3.15 | py3-bleach | 3.3.0-r0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | bleach | < 3.3.0 | 3.3.0 | GHSA-vv2x-vrpj-qqpq |
Advisories 7
- openSUSE-SU-2026:11323-1 python313-bleach-6.4.0-1.1 on GA media SUSE / openSUSE Security Updates · Jul 22, 2026
- RHSA-2021:0781 Red Hat Security Advisory: Red Hat Ansible Automation Platform 1.2.2 security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- DSA-4892-1 python-bleach - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2620-1 python-bleach - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2021:0571-1 Security update for python-bleach SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0552-1 Security update for python-bleach SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14134-1 python310-bleach-6.1.0-1.5 on GA media SUSE / openSUSE Security Updates · May 7, 2025