CVE-2026-42181— Lemmy: SSRF and internal image disclosure in post link metadata via unvalidated og:image
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I. Basic Information for CVE-2026-42181
Vulnerability Information
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Vulnerability Title
Lemmy: SSRF and internal image disclosure in post link metadata via unvalidated og:image
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Lemmy 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Lemmy是Lemmy开源的一款用于构建社交新闻聚合器和网络论坛的自由软件。 Lemmy 0.19.18之前版本存在代码问题漏洞，该漏洞源于提取的og:image URL未受内部IP范围限制，可能导致服务端请求伪造。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-42181
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- Release 0.19.18 · LemmyNet/lemmy · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-42181
IV. Related Vulnerabilities
Same product: lemmy
- CVE-2026-42180
Lemmy: SSRF in /api/v3/post via Webmention dispatch - CVE-2026-33693
Lemmy's Activitypub-Federation has SSRF via 0.0.0.0 bypass i - CVE-2026-29178
Lemmy: Unauthenticated SSRF via file_type query parameter in - CVE-2025-25194
Server-Side Request Forgery (SSRF) in activitypub_federation - CVE-2024-23649
Any authenticated user may obtain private message details fr
Same vendor: LemmyNet
- CVE-2026-42180
Lemmy: SSRF in /api/v3/post via Webmention dispatch - CVE-2026-33693
Lemmy's Activitypub-Federation has SSRF via 0.0.0.0 bypass i - CVE-2026-29178
Lemmy: Unauthenticated SSRF via file_type query parameter in - CVE-2025-25194
Server-Side Request Forgery (SSRF) in activitypub_federation - CVE-2024-23649
Any authenticated user may obtain private message details fr
Same weakness: CWE-918
- CVE-2026-44428
MCP Registry: GitHub OIDC tokens replayable across registry - CVE-2026-44430
MCP Registry: Unauthenticated SSRF: HTTP namespace verificat - CVE-2026-44661
python-utcp: SSRF via attacker-controlled OpenAPI servers[0] - CVE-2026-44589
nuxt-og-image SSRF — bypass of GHSA-pqhr-mp3f-hrpp / v6.2.5 - CVE-2026-44515
Nextcloud News: Authenticated blind SSRF via feed URL
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