CVE-2026-33693
Medium · 6.5CVSS
6.5
EPSS
0.4%
Published
Mar 27, 2026
CISA due date
—
The record
Lemmy is a link aggregator and forum for the fediverse. Prior to version 0.7.0-beta.9, the `v4_is_invalid()` function in `activitypub-federation-rust` (`src/utils.rs`) does not check for `Ipv4Addr::UNSPECIFIED` (0.0.0.0). An unauthenticated attacker controlling a remote domain can point it to 0.0.0.0, bypass the SSRF protection introduced by the fix for CVE-2025-25194 (GHSA-7723-35v7-qcxw), and reach localhost services on the target server. Version 0.7.0-beta.9 patches the issue.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| crates.io | activitypub_federation | 0 | 0.7.0-beta.9 |
| crates.io | activitypub_federation | 0 | No fix |
Related vulnerabilities
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- CVE-2026-111936 Sigma File Manager through 2.2.0 contains a server-side request forgery vulnerability… CWE-918
- CVE-2026-94483 Next.js is a React framework for building full-stack web applications. CWE-918
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