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.
References6
- github.com/vercel/next.js/commit/868fad38690d72088868f299fa2bef…
- github.com/vercel/next.js/releases/tag/v16.3.6
- github.com/vercel/next.js/security/advisories/GHSA-vcvr-r3jv-pc…
- github.com/vercel/satori/commit/26a52affc031216fee5882b6e965c8d…
- github.com/vercel/satori/pull/814
- github.com/vercel/satori/security/advisories/GHSA-wx4j-mvgx-mqwp
Metrics
- CVSS 4.0
-
5.3
MEDIUM
Score source: CNA
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 1% percentile: 65 · as of 10 November 2026
- CWE
- CWE-116
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.