Description
An issue was discovered in markdown2 (aka python-markdown2) through 2.3.5. The safe_mode feature, which is supposed to sanitize user input against XSS, is flawed and does not escape the input properly. With a crafted payload, XSS can be triggered, as demonstrated by omitting the final '>' character from an IMG tag.
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.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python-markdown2 | 2.4.0-2.4 | openSUSE-SU-2026:12016-1, openSUSE-SU-2024:14146-1, openSUSE-SU-2024:11237-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | markdown2 | < 2.3.6 | 2.3.6 | GHSA-p6h9-gw49-rqm4 |
Advisories 3
- openSUSE-SU-2026:12016-1 python313-markdown2-2.5.5-1.3 on GA media SUSE / openSUSE Security Updates · Oct 5, 2026
- openSUSE-SU-2024:11237-1 python36-markdown2-2.4.0-2.4 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14146-1 python310-markdown2-2.4.13-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026