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Vulnerability Details :

CVE-2026-42181

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-08 May, 2026 | 19:26
Updated At-11 May, 2026 | 16:01
Rejected At-
Credits

Lemmy: SSRF and internal image disclosure in post link metadata via unvalidated og:image

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:08 May, 2026 | 19:26
Updated At:11 May, 2026 | 16:01
Rejected At:
▼CVE Numbering Authority (CNA)
Lemmy: SSRF and internal image disclosure in post link metadata via unvalidated og:image

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.

Affected Products
Vendor
LemmyNet
Product
lemmy
Versions
Affected
  • < 0.19.18
Problem Types
TypeCWE IDDescription
CWECWE-918CWE-918: Server-Side Request Forgery (SSRF)
Type: CWE
CWE ID: CWE-918
Description: CWE-918: Server-Side Request Forgery (SSRF)
Metrics
VersionBase scoreBase severityVector
3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/LemmyNet/lemmy/security/advisories/GHSA-h6hf-9846-xwrq
x_refsource_CONFIRM
https://github.com/LemmyNet/lemmy/releases/tag/0.19.18
x_refsource_MISC
Hyperlink: https://github.com/LemmyNet/lemmy/security/advisories/GHSA-h6hf-9846-xwrq
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/LemmyNet/lemmy/releases/tag/0.19.18
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/LemmyNet/lemmy/security/advisories/GHSA-h6hf-9846-xwrq
exploit
Hyperlink: https://github.com/LemmyNet/lemmy/security/advisories/GHSA-h6hf-9846-xwrq
Resource:
exploit
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:08 May, 2026 | 20:16
Updated At:11 May, 2026 | 17:16

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Type: Secondary
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-918Secondarysecurity-advisories@github.com
CWE ID: CWE-918
Type: Secondary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/LemmyNet/lemmy/releases/tag/0.19.18security-advisories@github.com
N/A
https://github.com/LemmyNet/lemmy/security/advisories/GHSA-h6hf-9846-xwrqsecurity-advisories@github.com
N/A
https://github.com/LemmyNet/lemmy/security/advisories/GHSA-h6hf-9846-xwrq134c704f-9b21-4f2e-91b3-4a467353bcc0
N/A
Hyperlink: https://github.com/LemmyNet/lemmy/releases/tag/0.19.18
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/LemmyNet/lemmy/security/advisories/GHSA-h6hf-9846-xwrq
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/LemmyNet/lemmy/security/advisories/GHSA-h6hf-9846-xwrq
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource: N/A

Change History

0
Information is not available yet

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