CVE-2026-47746 Details
Description
Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, are vulnerable to timing attacks during JSON-LD signature validation and the compaction process. Because the JSON-LD parsing context is not shared between signature verification and subsequent processing, the application may trust information that should not be trusted, resulting in a time-of-check to time-of-use (TOCTOU) flaw. This allows an attacker to have fraudulent activities accepted as valid, leading to a loss of integrity. This issue has been fixed in version 2026.5.4.
A timing attack vulnerability has been identified in Misskey, an open-source federated social media platform, in versions 12.37.0 and later but prior to 2026.5.4. This vulnerability arises during JSON-LD signature validation and the compaction process, where the parsing context is not consistently shared. As a result, the application may incorrectly trust certain information, leading to a time-of-check to time-of-use (TOCTOU) flaw. Exploiting this vulnerability allows an attacker to have fraudulent activities recognized as legitimate, causing a loss of integrity.
Users are advised to update to Misskey version 2026.5.4, which addresses this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Aug 3, 2026CISA-ADP
Assessed Aug 4, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/misskey-dev/misskey/releases/tag/2026.5.4 | [email protected] | Release NotesVendor |
| https://github.com/misskey-dev/misskey/security/advisories/GHSA-38jx-423m-g387 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-367 | Time-of-check Time-of-use (TOCTOU) Race Condition | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Misskey | >= 12.37.0, < 2026.5.4 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 4, 2026 | CVE Modified | CISA-ADP |
| Aug 3, 2026 | New CVE Received | [email protected] |