CVE-2026-41688 Incomplete fix for CVE-2026-33399: SSRF in Wallos
Attackers can exploit a DNS rebinding vulnerability in Wallos to bypass SSRF protections and access internal network resources.
- 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-2026-41688?
CVE-2026-41688 is a high-severity server-side request forgery vulnerability in ellite Wallos, published on 7 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Wallos is an open-source, self-hostable personal subscription tracker. In versions 4.8.4 and prior, the incomplete SSRF fix in Wallos validates webhook URLs via gethostbyname() but passes the original hostname to cURL without CURLOPT_RESOLVE pinning on 10 of 11 outbound HTTP endpoints, leaving a DNS rebinding TOCTOU window. At time of publication, there are no publicly available patches.
Weakness: CWE-918
Which versions are affected by CVE-2026-41688?
How do I fix CVE-2026-41688?
No fix has been published for CVE-2026-41688 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-2026-41688 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41688 exists.
Sources
Also known as GHSA-h4g7-xv3v-q73g.