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Vulnerability · Published Sep 30, 2026 · Assigned by GitHub_M

CVE-2026-94545Satori-generated SVG has improper escaping

Medium 5.3

In plain English

A medium-severity security flaw in next from vercel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 65% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.3Medium
Exploit odds (30 days)1.1%top 34.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official description

Satori is a library to convert HTML and CSS to SVG. Starting in version 0.0.27 and prior to version 0.33.5, Satori does not properly escape certain values before including them in generated SVG output. This can allow crafted values to be interpreted as SVG markup. The impact depends on how the generated SVG is consumed. Version 0.33.5 contains a patch. No complete workaround exists besides upgrading. Applications that cannot immediately upgrade should not render attacker-controlled content with Satori.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmsatori0.33.5GHSA-wx4j-mvgx-mqwp

Affected products (as reported)

VendorProductVersions
vercel satori >= 0.0.27, < 0.33.5
vercel next >= 16.2.0, < 16.3.6

Weakness: CWE-116 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

References