Medium 5.8Published Oct 27, 2026

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

Updated under an hour ago (Oct 30, 2026, 4:23 AM ET)

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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.

CVSS: 5.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Weakness (CWE): CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 27, 2026
First seen by InfoSec Signals: Oct 27, 2026

Affected products

Affected products

dani-garcia vaultwarden dani_garcia:vaultwarden (from the name)	before 1.37.0	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.