Is CVE-2026-42181 actively exploited?

No active exploitation of CVE-2026-42181 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42181 be exploited remotely?

Yes. CVE-2026-42181 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42181?

CVE-2026-42181 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2026-42181

CWE-918Published: May 8, 2026· Updated: May 12, 2026

6.5

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.1th

Official Description

Lemmy is a link aggregator and forum for the fediverse. Prior to version 0.19.18, Lemmy fetches metadata for user-supplied post URLs and, under the default StoreLinkPreviews image mode, downloads the preview image through local pict-rs. While the top-level page URL is checked against internal IP ranges, the extracted og:image URL is not subject to the same restriction. As a result, an authenticated low-privileged user can submit an attacker-controlled public page whose Open Graph image points to an internal image endpoint. Lemmy will fetch that internal image server-side and store a local thumbnail that can then be served back to users. This issue has been patched in version 0.19.18.

NVD Source

Technical Analysis

CVE-2026-42181 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.5.