CVE-2026-42462
HIGHDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
Exploit Intelligence
Low risk: more likely to be exploited than 7% of all known CVEs.
References
Related Vulnerabilities
Other CWE-180 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-26136 | Critical | 9.8 | 5.0% | - | Fix |
| CVE-2022-26137 | High | 8.8 | 2.2% | - | Fix |
| CVE-2026-39364 | High | 7.5 | 2.1% | - | Fix |
| CVE-2025-43716 | Medium | 5.8 | 1.2% | - | - |
| CVE-2026-24895 | Critical | 9.8 | 0.6% | - | Fix |
| CVE-2026-27590 | Critical | 9.8 | 0.5% | - | Fix |
Common questions
How do I fix CVE-2026-42462?
No published fix for CVE-2026-42462 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-42462 being actively exploited?
Not that we know of. CVE-2026-42462 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.17% is the estimated probability that it will be exploited in the next 30 days. That is higher than 7% of all scored CVEs.
How severe is CVE-2026-42462?
CVE-2026-42462 has a CVSS v3 base score of 7.0, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-23.