CVE-2026-94545: CWE-116: Improper Encoding or Escaping of Output in vercel satori
CVE-2026-94545 is a vulnerability in the vercel satori library, which converts HTML and CSS to SVG. Versions from 0.0.27 up to but not including 0.33.5, and versions from 16.2.0 up to but not including 16.3.6, do not properly escape certain values before including them in generated SVG output. This improper encoding can allow crafted input to be interpreted as SVG markup. The vulnerability is patched in version 0.33.5. No complete workaround exists other than upgrading. Applications that cannot upgrade immediately should avoid rendering attacker-controlled content with satori.
AI Analysis
Technical Summary
Satori versions >=0.0.27 <0.33.5 and >=16.2.0 <16.3.6 suffer from CWE-116: improper encoding or escaping of output. This flaw allows crafted values to be interpreted as SVG markup in generated SVG output. The impact depends on how the SVG is consumed by the application or environment. Version 0.33.5 includes a patch that fixes this escaping issue. There is no complete workaround besides upgrading; applications should avoid rendering untrusted content if they cannot upgrade promptly.
Potential Impact
The vulnerability allows attacker-controlled input to be interpreted as SVG markup, which could lead to injection of malicious SVG content. The actual impact depends on the context in which the generated SVG is used. There are no known exploits in the wild. The CVSS 4.0 score is 5.3 (medium severity), reflecting network attack vector, low complexity, partial attack complexity, no privileges required, user interaction required, and high scope and impact on security integrity and availability.
Mitigation Recommendations
A patch is available in satori version 0.33.5. Users should upgrade to this version or later to remediate the vulnerability. There is no complete workaround other than upgrading. Applications that cannot upgrade immediately should avoid rendering attacker-controlled content with satori to mitigate risk.
CVE-2026-94545: CWE-116: Improper Encoding or Escaping of Output in vercel satori
Description
CVE-2026-94545 is a vulnerability in the vercel satori library, which converts HTML and CSS to SVG. Versions from 0.0.27 up to but not including 0.33.5, and versions from 16.2.0 up to but not including 16.3.6, do not properly escape certain values before including them in generated SVG output. This improper encoding can allow crafted input to be interpreted as SVG markup. The vulnerability is patched in version 0.33.5. No complete workaround exists other than upgrading. Applications that cannot upgrade immediately should avoid rendering attacker-controlled content with satori.
CVSS v4.0
Score 5.3medium
Affected software
vercel
satori
vercel
next
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Satori versions >=0.0.27 <0.33.5 and >=16.2.0 <16.3.6 suffer from CWE-116: improper encoding or escaping of output. This flaw allows crafted values to be interpreted as SVG markup in generated SVG output. The impact depends on how the SVG is consumed by the application or environment. Version 0.33.5 includes a patch that fixes this escaping issue. There is no complete workaround besides upgrading; applications should avoid rendering untrusted content if they cannot upgrade promptly.
Potential Impact
The vulnerability allows attacker-controlled input to be interpreted as SVG markup, which could lead to injection of malicious SVG content. The actual impact depends on the context in which the generated SVG is used. There are no known exploits in the wild. The CVSS 4.0 score is 5.3 (medium severity), reflecting network attack vector, low complexity, partial attack complexity, no privileges required, user interaction required, and high scope and impact on security integrity and availability.
Mitigation Recommendations
A patch is available in satori version 0.33.5. Users should upgrade to this version or later to remediate the vulnerability. There is no complete workaround other than upgrading. Applications that cannot upgrade immediately should avoid rendering attacker-controlled content with satori to mitigate risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-21T19:21:33.371Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abd25252a4e24523d2793e3
Added to database: 09/30/2026, 15:05:09 UTC
Last enriched: 09/30/2026, 15:18:30 UTC
Last updated: 09/30/2026, 15:30:07 UTC
Views: 4
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