CVE-2026-62857Disclosure

LOWCVSS 8.8 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. From version 1.2.0 through the affected 1.9, 1.10, 2.0, 2.1, 2.2, and 2.3 maintenance lines, getNodeInfo() follows an attacker-controlled links[].href value from /.well-known/nodeinfo without scheme, redirect, or private-address validation, allowing requests to loopback, link-local, cloud metadata, and private-network services and returning their response bodies. This issue is fixed in versions 1.9.13, 1.10.12, 2.0.22, 2.1.18, 2.2.7, and 2.3.2.

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-918

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Full discourse1 post

CyberSignal | Cybersecurity News@XQOPTRX46d
Disclosure
🌐 ActivityPub library Fedify hit by SSRF CVE-2026-62857 Fedify's getNodeInfo() can follow attacker-controlled URLs without properly restricting schemes, redirects or private addresses. Potential targets include localhost, private networks and cloud metadata services. 🔎 Source: Tenable / GitHub Advisory #SSRF #ActivityPub #CloudSecurity #CVE
Post summary
The tweet discloses a new SSRF vulnerability (CVE-2026-62857) in the Fedify ActivityPub library that allows attackers to resolve arbitrary URLs, potentially targeting localhost, private networks, and cloud metadata services.
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