CVE-2026-22813

critical · 9.4

OpenCode is an open source AI coding agent. The markdown renderer used for LLM responses will insert arbitrary HTML into the DOM. There is no sanitization with DOMPurify or even a CSP on the web interface to prevent JavaScript execution via HTML injection. This means controlling the LLM response for a chat session gets JavaScript execution on the http://localhost:4096 origin. This vulnerability is fixed in 1.1.10.

9.4

CVSS

0.9%

EPSS (exploit prob.)

59th

EPSS percentile

2026-01-12

Published

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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

Weaknesses

CWE-79

Affected products

Vendor	Product	Affected versions
anoma	opencode	< 1.1.10

Check a specific version with /api/v1/cve/match.

References

https://github.com/anomalyco/opencode/security/advisories/GHSA-c83v-7274-4vgp
https://github.com/anomalyco/opencode/security/advisories/GHSA-c83v-7274-4vgp

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-22813