CVE-2026-82476
Received Received - Intake

Memos Link-Metadata SSRF Bypass via Unprotected CGNAT Range

Publication date: 2026-08-29

Last updated on: 2026-08-29

Assigner: VulnCheck

Description
Memos through 0.30.0 omits the 100.64.0.0/10 carrier-grade NAT address range from SSRF protection in its link-metadata fetcher, allowing unauthenticated attackers to bypass IP validation. Attackers can make the server request internal hosts in that range including cloud metadata services and read page titles and descriptions back.

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Meta Information

Published
2026-08-29
Last Modified
2026-08-29
Generated
2026-08-29
AI Q&A
2026-08-29
EPSS Evaluated
N/A
NVD
CVE-2026-82476
EUVD
EUVD-2026-68132

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
usememos memos to 0.30.0 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-918 The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

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Executive Summary

CVE-2026-82476 is a Server-Side Request Forgery (SSRF) vulnerability in Memos versions up to 0.30.0. It occurs because the application fails to block the 100.64.0.0/10 carrier-grade NAT address range in its SSRF protection. Attackers can exploit this to bypass IP validation and force the server to fetch metadata from internal hosts in that range, including cloud metadata services. The server then reflects the fetched content back to the attacker.

Detection Guidance

To detect this vulnerability, check if your Memos instance (v0.30.0 or earlier) is running and accessible. Test if the server can fetch metadata from internal CGNAT addresses (100.64.0.0/10) by sending a crafted request to the unauthenticated GetLinkMetadata or BatchGetLinkMetadata endpoints. Use curl commands like: curl -X POST http://<memos-server>/api/v1/GetLinkMetadata -d '{"url":"http://100.100.100.200"}' to see if it returns metadata from internal services.

Impact Analysis

Unauthenticated attackers can make the Memos server request internal resources in the 100.64.0.0/10 range. This could expose sensitive information like cloud metadata (e.g., RAM credentials) if such services are accessible. The server may return page titles and descriptions from internal hosts, leading to information disclosure. Impact depends on the deployment environment and whether sensitive services are reachable.

Compliance Impact

This vulnerability could lead to unauthorized access to internal systems and exposure of sensitive data, violating GDPR's data protection principles and HIPAA's security requirements for protected health information. Organizations must ensure SSRF protections cover all private IP ranges to maintain compliance.

Mitigation Strategies

Upgrade Memos to a patched version that includes the 100.64.0.0/10 range in its SSRF protection. If upgrading is not immediately possible, manually add the 100.64.0.0/10 CIDR block to the denylist in the isInternalIP() function and reservedCIDRs list in internal/webhook/validate.go. Disable unauthenticated link-metadata fetching endpoints if not required.

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