Is CVE-2026-33693 actively exploited?

No active exploitation of CVE-2026-33693 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33693 be exploited remotely?

Yes. CVE-2026-33693 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33693?

CVE-2026-33693 has a CVSS score of 6.5 (MEDIUM).

HOME VULNERABILITIESCVE-2026-33693

MEDIUM

CVE-2026-33693

CWE-918Published: March 27, 2026· Updated: Mar 30, 2026

6.5

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:13.4th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-33693 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.