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CVE-2026-29178— Lemmy: Unauthenticated SSRF via file_type query parameter injection in image endpoint

Quick assessment

Affected
LemmyNet lemmy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 0.19.16之前版本存在安全漏洞，该漏洞源于/api/v4/image/{filename}端点存在参数注入，可能导致服务端请求伪造。

AI Predicted 9.1 Difficulty: Trivial EPSS 0.45% · P38
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I. Basic Information for CVE-2026-29178

Vulnerability Information
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Vulnerability Title
Lemmy: Unauthenticated SSRF via file_type query parameter injection in image endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Lemmy, a link aggregator and forum for the fediverse, is vulnerable to server-side request forgery via a dependency on activitypub_federation, a framework for ActivityPub federation in Rust. Prior to version 0.19.16, the GET /api/v4/image/{filename} endpoint is vulnerable to unauthenticated SSRF through parameter injection in the file_type query parameter. An attacker can inject arbitrary query parameters into the internal request to pict-rs, including the proxy parameter which causes pict-rs to fetch arbitrary URLs. This issue has been patched in version 0.19.16.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Lemmy 安全漏洞
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 0.19.16之前版本存在安全漏洞，该漏洞源于/api/v4/image/{filename}端点存在参数注入，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

Vendor Product Affected Versions CPE Subscribe
LemmyNet lemmy < 0.19.16 -

II. Public POCs for CVE-2026-29178

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III. Intelligence Information for CVE-2026-29178

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Patches & Fixes for CVE-2026-29178 (1)

Vendor Advisories for CVE-2026-29178 (1)

IV. Related Vulnerabilities

Same product: lemmy
Same vendor: LemmyNet
Same weakness: CWE-918