OpenCode's Unauthenticated HTTP Server Allows Arbitrary Command Execution

published 2026-01-12 9mo ago modified 2026-06-17 4mo ago also GHSA-vxw4-wv6m-9hhh , EUVD-2026-2092

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 16.5%; EPSS 16.5% chance of exploitation in 30 days, percentile 97%
public exploits: 0; none known, plus a Nuclei check

OpenCode is an open source AI coding agent. Prior to 1.0.216, OpenCode automatically starts an unauthenticated HTTP server that allows any local process (or any website via permissive CORS) to execute arbitrary shell commands with the user's privileges. This vulnerability is fixed in 1.0.216.

Patch / fix

fixed in 2 links 1

npm opencode-ai 1.0.216
anoma opencode 1.0.216

github.com/anomalyco/opencode@7d2d87f commit

Is CVE-2026-22812 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 9mo ago (2026-01-13)

Exploit prediction

16.54% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

Nuclei template OpenCode < 1.0.216 - Unauthenticated Remote Code Execution nuclei detection template
github.com https://github.com/anomalyco/opencode/security/advisories/GHSA-vxw4-wv6m-9hhh referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
GitHub	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	opencode-ai	<1.0.216	1.0.216

Affected products

anomalyco opencode

Classification

Weakness

CWE-306 Missing Authentication for Critical Functionality
CWE-749 Exposed Dangerous Method or Function
CWE-942 Permissive Cross-domain Security Policy with Untrusted Domains

References

github.com /anomalyco/opencode/commit/7d2d87fa2c44e32314015980bb4e59a9386e858c
web
github.com /anomalyco/opencode/security/advisories/GHSA-vxw4-wv6m-9hhh
exploit, web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2026-22812
advisory
github.com /anomalyco/opencode
package

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

json critical feed