PatchTheCVECVE-2026-30830: Defuddle cleans up HTML pages
CVE-2026-30830 is a medium-severity flaw (CVSS 6.1) affecting defuddle. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Defuddle cleans up HTML pages. Prior to version 0.9.0, the _findContentBySchemaText method in src/defuddle.ts interpolates image src and alt attributes directly into an HTML string without escaping. An attacker can use a " in the alt attribute to break out of the attribute context and inject event handler. This issue has been patched in version 0.9.0.
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.1 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.3% (top 81%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2026-03-07 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-30830?
defuddle: upgrade to 0.9.0. Exact commands for each OS are on this page.
Is CVE-2026-30830 being exploited?
CVE-2026-30830 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-30830 affect?
CVE-2026-30830 affects defuddle. Severity is medium (CVSS 6.1). Defuddle cleans up HTML pages. Prior to version 0.9.0, the _findContentBySchemaText method in src/defuddle.ts interpolates image src and alt attributes directly into an HTML string without escaping. An attacker can use a " in the alt attrib
How urgent is CVE-2026-30830?
Priority 31/100. Public exploit reference