CVE-2026-107379 enshrined/svg-sanitize: Denial of Service via DTD Attribute Declaration Crash
An attacker can cause a denial of service by submitting crafted SVG content that crashes the PHP worker via a double attribute removal bug.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-107379?
CVE-2026-107379 is a medium-severity denial of service vulnerability in darylldoyle svg-sanitizer, published on 8 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
savg-sanitizer is a PHP SVG/XML sanitizer. Prior to 1.0.0, svg-sanitizer allows a crafted SVG DTD with a #FIXED attribute default to make cleanAttributesOnWhitelist() perform a double DOMElement::removeAttribute() call on the same attribute name in src/Sanitizer.php. The first removal deletes the explicit attribute, while the DTD default rematerializes the value before the href safety path performs the second removal, which can corrupt libxml state and terminate the PHP worker. An attacker who can submit SVG content to a sanitization endpoint can repeatedly interrupt workers and degrade or exhaust application availability. This issue is fixed in version 1.0.0.
Weakness: CWE-770
Which versions are affected by CVE-2026-107379?
2 open source packages ship an affected version, including enshrined/svg-sanitize.
| Package | Affected | Fixed in |
|---|---|---|
enshrined/svg-sanitize Packagist | All versions | 1.0.0 |
enshrined/svg-sanitize Packagist | All versions | 1.0.0 |
How do I fix CVE-2026-107379?
Upgrade enshrined/svg-sanitize to 1.0.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-107379 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-107379 exists.
Sources
Also known as GHSA-v383-3rw5-q8rf.