CVE-2026-41688: Incomplete fix for CVE-2026-33399: SSRF in Wallos

Severity: high (CVSS 7.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-07 · updated 2026-10-26
Weakness: CWE-918

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.

Affected products

ellite Wallos: through 4.8.4

References

https://github.com/ellite/Wallos/commit/e87387f0ebb540cd33e6dfda7181db9db650ecef
https://github.com/ellite/Wallos/security/advisories/GHSA-h4g7-xv3v-q73g

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