CVE-2026-116678 Vaultwarden: Icon endpoint SSRF fix bypass via second-stage favicon IP literal URLs
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-116678?
CVE-2026-116678 is a medium-severity vulnerability in dani-garcia vaultwarden, published on 27 Oct 2026.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-116678?
How do I fix CVE-2026-116678?
No fix has been published for CVE-2026-116678 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-116678 being exploited?
There is no known exploitation of CVE-2026-116678 in the wild and no public exploit code.
Sources
Also known as GHSA-hw4g-2v3f-74x5.