CVE-2026-42462Disclosure

LOWCVSS 7.0 · HIGH

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

Patch affected systems immediately
Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft

Recommended action window: High priority (within 72h)

NVD description

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its Linked Data Signature, allowing them to alter a third-party signed activity they have received. Versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3 fix the issue.

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2.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-180CWE-347CWE-436CWE-1289

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

NONE

Threat summary

Public PoC is present in monitored signal
Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

PoC mentioned or linked in 1 signal
Patch or workaround mentioned in 1 signal
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%

Referenced assets1 URL

By indicator

https://www.valtersit.com/cve/CVE-2026-42462

Full discourse1 post

Hugo | DevOps | Cybersecurity 🇱🇻@HugoValters137d
Disclosure
CVE-2026-42462 - JSON-LD restructuring bypass in Fedify. Attackers can alter signed activities by exploiting JSON-LD features. CVSS 7.0. Update to patched versions immediately. #CVE #Fedify #infosec A FREE Tool/place for #cybersecurity experts: https://www.valtersit.com/cve/CVE-2026-42462
Post summary
The post announces a new CVE‑2026‑42462 vulnerability in Fedify, providing technical details, CVSS score, a call to update to patches, and a link that may host a PoC resource.
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