CVE-2026-62857Public exploitNetwork attack vectorHinoki check available

Internal resource disclosure via unvalidated NodeInfo URL

Published Aug 6, 2026 · Updated Aug 6, 2026

SSRF in Fedify allows remote attackers to read internal HTTP resources through a NodeInfo lookup of an attacker-controlled peer. The getNodeInfo() function and Context.lookupNodeInfo() wrapper fetch links[].href from /.well-known/nodeinfo with raw fetch(), without validating the scheme, redirect path, or resolved address. The application must look up an attacker-controlled instance; Fedify then returns response bodies from reachable loopback, link-local, metadata, or private-network HTTP services.

CVSS severity8.8
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

SSRF in Fedify allows remote attackers to read internal HTTP resources through a NodeInfo lookup of an attacker-controlled peer. The getNodeInfo() function and Context.lookupNodeInfo() wrapper fetch links[].href from /.well-known/nodeinfo with raw fetch(), without validating the scheme, redirect path, or resolved address. The application must look up an attacker-controlled instance; Fedify then returns response bodies from reachable loopback, link-local, metadata, or private-network HTTP services.

The record

CVE
CVE-2026-62857
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
Fedify
Product
Fedify
Classifications
CWE-918, CAPEC-664, T1552.005, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.10.0, < 1.10.12
  2. Affected versionversion=>= 1.2.0, < 1.9.13
  3. Affected versionversion=>= 2.0.0, < 2.0.22
  4. Affected versionversion=>= 2.1.0, < 2.1.18
  5. Affected versionversion=>= 2.2.0, < 2.2.7
  6. Affected versionversion=>= 2.3.0, < 2.3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fedify · Fedifyversion=>= 1.10.0, < 1.10.12; version=>= 1.2.0, < 1.9.13; version=>= 2.0.0, < 2.0.22; version=>= 2.1.0, < 2.1.18; version=>= 2.2.0, < 2.2.7; version=>= 2.3.0, < 2.3.2

Published CVSS scores

8.8GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1552.005Cloud Instance Metadata API
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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