CVE-2026-94621 AliasVault: Server-Side Request Forgery via DNS rebinding in Favicon Extraction
Authenticated users can exploit DNS rebinding in the favicon extractor to force the server to make requests to internal hosts, enabling network reconnaissance.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-94621?
CVE-2026-94621 is a medium-severity server-side request forgery vulnerability in aliasvault, published on 15 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
AliasVault is a privacy-first password manager with built-in email aliasing. Prior to 0.30.3, the AliasVault server API favicon extractor validates a user-supplied hostname with a first DNS lookup but allows the HTTP client to perform a second DNS lookup when connecting. An authenticated low-privileged user operating an attacker-controlled authoritative DNS server can return a public address during validation and a private address during connection, causing a publicly reachable self-hosted server to issue HTTP or HTTPS requests to internal hosts. A valid image response is returned in Base64 form, while other responses can expose limited timing and error information for internal-network reconnaissance. Exploitation requires a publicly reachable self-hosted instance with public registration enabled, an authenticated AliasVault account, an attacker-controlled authoritative DNS server, and a resolver that permits rebinding; default checks limit requests to ports 80 and 443. The browser extensions, web application, and mobile applications are not affected. This issue is fixed in version 0.30.3.
Which versions are affected by CVE-2026-94621?
How do I fix CVE-2026-94621?
No fix has been published for CVE-2026-94621 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-94621 being exploited?
There is no known exploitation of CVE-2026-94621 in the wild and no public exploit code.
Sources
Also known as GHSA-7hm6-fj4m-pf6f.