High
Misskey: JSON-LD signature validation + compaction is vulnerable to timing attacks
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-47746
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 13:25 UTC · Revision 1
Source evidence
Misskey: JSON-LD signature validation + compaction is vulnerable to timing attacks
core-osv · Original sourcePublished 3 Aug 2026, 21:56 UTC
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.
osv:CVE-2026-47746
Complete source record
{
"id": "45fe337a1a5af0c18b783042c9e21a08f38a07e6d054d0593d74c5cd2cf6ec92",
"url": "https://osv.dev/vulnerability/CVE-2026-47746",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Misskey: JSON-LD signature validation + compaction is vulnerable to timing attacks",
"summary": "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.",
"evidence": "osv:CVE-2026-47746",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-47746",
"aliases": [
"CVE-2026-47746",
"GHSA-38jx-423m-g387"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/misskey-dev/misskey",
"type": "GIT",
"events": [
{
"introduced": "4ea60d36e5725aad51a1b75ba9ea4fc40db75faa"
},
{
"fixed": "4aa1d9ffc851a7824cb72b84ec01c3f65613463c"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "12.37.0"
},
{
"fixed": "2026.5.4"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "4aa1d9ffc851a7824cb72b84ec01c3f65613463c"
}
],
"source": "REFERENCES_TAG",
"original_tag": "2026.5.4"
},
{
"range": [
{
"introduced": "0"
},
{
"fixed": "2026.5.4"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
"versions": [
"2026.5.4-beta.0",
"2026.5.4-alpha.0",
"2026.5.3",
"2026.5.3-alpha.0",
"2026.5.2",
"2026.5.2-beta.1",
"2026.5.2-beta.0",
"2026.5.2-alpha.0",
"2026.5.1",
"2026.5.1-beta.0",
"2026.5.1-alpha.0",
"2026.5.0",
"2026.5.0-alpha.0",
"2026.4.0-beta.2",
"2026.4.0-beta.1",
"2026.4.0-beta.0",
"2026.4.0-alpha.6",
"2026.4.0-alpha.5",
"2026.4.0-alpha.4",
"2026.4.0-alpha.3",
"2026.4.0-alpha.2",
"2026.4.0-alpha.1",
"2026.4.0-alpha.0",
"2026.3.2",
"2026.3.2-beta.0",
"2026.3.2-alpha.2",
"2026.3.2-alpha.1",
"2026.3.2-alpha.0",
"2026.3.1",
"2026.3.1-alpha.0",
"2026.3.0",
"2026.3.0-alpha.0",
"2026.2.0-beta.0",
"2026.2.0-alpha.0",
"2026.1.0-beta.0",
"2026.1.0-alpha.4",
"2026.1.0-alpha.3",
"2026.1.0-alpha.2",
"2026.1.0-alpha.1",
"2026.1.0-alpha.0",
"2025.12.2",
"2025.12.2-beta.4",
"2025.12.2-beta.3",
"2025.12.2-beta.2",
"2025.12.2-alpha.0",
"2025.12.1",
"2025.12.1-alpha.1",
"2025.12.1-alpha.0",
"2025.12.0",
"2025.12.0-beta.0",
"2025.12.0-alpha.2",
"2025.12.0-alpha.1",
"2025.12.0-alpha.0",
"2025.11.2-alpha.4",
"2025.11.2-alpha.3",
"2025.11.2-alpha.2",
"2025.11.2-alpha.1",
"2025.11.2-alpha.0",
"2025.11.1",
"2025.11.1-beta.3",
"2025.11.1-beta.2",
"2025.11.1-beta.1",
"2025.11.1-beta.0",
"2025.11.1-alpha.2",
"2025.11.1-alpha.1",
"2025.11.1-alpha.0",
"2025.11.0",
"2025.11.0-rc.0",
"2025.11.0-beta.0",
"2025.11.0-alpha.4",
"2025.11.0-alpha.3",
"2025.11.0-alpha.2",
"2025.11.0-alpha.1",
"2025.11.0-alpha.0",
"2025.10.2",
"2025.10.2-beta.0",
"2025.10.2-alpha.0",
"2025.10.1",
"2025.10.1-beta.4",
"2025.10.1-beta.2",
"2025.10.1-beta.1",
"2025.10.1-beta.0",
"2025.10.1-alpha.6",
"2025.10.1-alpha.5",
"2025.10.1-alpha.4",
"2025.10.1-alpha.2",
"2025.10.1-alpha.1",
"2025.10.1-alpha.0",
"2025.10.0",
"2025.10.0-beta.2",
"2025.10.0-beta.1",
"2025.10.0-beta.0",
"2025.10.0-alpha.0",
"2025.9.1-alpha.2",
"2025.9.1-alpha.1",
"2025.9.1-alpha.0",
"2025.9.0",
"2025.9.0-rc.0",
"2025.9.0-beta.1",
"2025.9.0-beta.0",
"2025.9.0-alpha.2",
"2025.9.0-alpha.1",
"2025.9.0-alpha.0",
"2025.8.0",
"2025.8.0-rc.0",
"2025.8.0-beta.6",
"2025.8.0-beta.5",
"2025.8.0-beta.4",
"2025.8.0-beta.3",
"2025.8.0-beta.2",
"2025.8.0-beta.1",
"2025.8.0-beta.0",
"2025.8.0-alpha.13",
"2025.8.0-alpha.12",
"2025.8.0-alpha.11",
"2025.8.0-alpha.9",
"2025.8.0-alpha.8",
"2025.8.0-alpha.7",
"2025.8.0-alpha.6",
"2025.8.0-alpha.5",
"2025.8.0-alpha.4",
"2025.8.0-alpha.3",
"2025.8.0-alpha.2",
"2025.8.0-alpha.1",
"2025.8.0-alpha.0",
"2025.7.0",
"2025.7.0-rc.1",
"2025.7.0-rc.0",
"2025.7.0-beta.2",
"2025.7.0-beta.1",
"2025.7.0-alpha.0",
"2025.6.4-alpha.4",
"2025.6.4-alpha.3",
"2025.6.4-alpha.2",
"2025.6.4-alpha.1",
"2025.6.4-alpha.0",
"2025.6.3",
"2025.6.3-alpha.0",
"2025.6.2",
"2025.6.2-alpha.0",
"2025.6.1",
"2025.6.1-rc.0",
"2025.6.1-beta.2",
"2025.6.1-beta.1",
"2025.6.1-beta.0",
"2025.6.1-alpha.4",
"2025.6.1-alpha.2",
"2025.6.1-alpha.1",
"2025.6.1-alpha.0",
"2025.6.0",
"2025.6.0-beta.1",
"2025.6.0-beta.0",
"2025.6.0-alpha.0",
"2025.5.1",
"2025.5.1-beta.6",
"2025.5.1-beta.5",
"2025.5.1-beta.4",
"2025.5.1-beta.3",
"2025.5.1-beta.2",
"2025.5.1-beta.1",
"2025.5.1-alpha.5",
"2025.5.1-alpha.4",
"2025.5.1-alpha.3",
"2025.5.1-alpha.2",
"2025.5.1-alpha.1",
"2025.5.1-alpha.0",
"2025.5.0",
"2025.5.0-rc.0",
"2025.5.0-beta.0",
"2025.5.0-alpha.2",
"2025.5.0-alpha.1",
"2025.5.0-alpha.0",
"2025.4.1",
"2025.4.1-rc.0",
"2025.4.1-beta.9",
"2025.4.1-beta.8",
"2025.4.1-beta.7",
"2025.4.1-beta.6",
"2025.4.1-beta.2",
"2025.4.1-beta.0",
"2025.4.1-alpha.2",
"2025.4.1-alpha.1",
"2025.4.1-alpha.0",
"2025.4.0",
"2025.4.0-rc.5",
"2025.4.0-rc.4",
"2025.4.0-rc.0",
"2025.4.0-beta.1",
"2025.4.0-beta.0",
"2025.4.0-alpha.0",
"2025.3.2-beta.21",
"2025.3.2-beta.20",
"2025.3.2-beta.19",
"2025.3.2-beta.17",
"2025.3.2-beta.15",
"2025.3.2-beta.14",
"2025.3.2-beta.13",
"2025.3.2-beta.12",
"2025.3.2-beta.11",
"2025.3.2-beta.10",
"2025.3.2-beta.9",
"2025.3.2-beta.8",
"2025.3.2-beta.5",
"2025.3.2-beta.4",
"2025.3.2-beta.2",
"2025.3.2-beta.1",
"2025.3.2-beta.0",
"2025.3.2-alpha.11",
"2025.3.2-alpha.10",
"2025.3.2-alpha.8",
"2025.3.2-alpha.4",
"2025.3.2-alpha.3",
"2025.3.2-alpha.2",
"2025.3.2-alpha.1",
"2025.3.1",
"2025.3.1-beta.3",
"2025.3.1-beta.2",
"2025.3.1-beta.1",
"2025.3.1-beta.0",
"2025.3.1-alpha.0",
"2025.3.0",
"2025.3.0-beta.2",
"2025.3.0-beta.1",
"2025.3.0-beta.0",
"2025.3.0-alpha.0",
"2025.2.1",
"2025.2.1-beta.2",
"2025.2.1-beta.1",
"2025.2.1-beta.0",
"2025.2.1-alpha.0",
"2025.2.0",
"2025.2.0-beta.1",
"2025.2.0-beta.0",
"2025.2.0-alpha.0",
"2025.1.0",
"2025.1.0-beta.3",
"2025.1.0-beta.2",
"2025.1.0-beta.1",
"2025.1.0-beta.0",
"2025.1.0-alpha.0",
"2024.11.0",
"2024.11.0-beta.4",
"2024.11.0-alpha.3",
"2024.11.0-alpha.2",
"2024.11.0-alpha.1",
"2024.10.2-alpha.2",
"2024.10.2-alpha.1",
"2024.10.2-alpha.0",
"2024.10.1",
"2024.10.1-beta.6",
"2024.10.1-beta.5",
"2024.10.1-beta.4",
"2024.10.1-beta.3",
"2024.10.1-beta.2",
"2024.10.1-beta.1",
"2024.10.1-alpha.0",
"2024.10.0",
"2024.10.0-beta.6",
"2024.10.0-beta.5",
"2024.10.0-beta.4",
"2024.10.0-beta.3",
"2024.10.0-beta.2",
"2024.10.0-alpha.1",
"2024.10.0-alpha.0",
"2024.9.0",
"2024.9.0-beta.14",
"2024.9.0-alpha.13",
"2024.9.0-alpha.12",
"2024.9.0-alpha.11",
"2024.9.0-alpha.10",
"2024.9.0-alpha.9",
"2024.9.0-alpha.8",
"2024.9.0-alpha.7",
"2024.9.0-alpha.6",
"2024.9.0-alpha.5",
"2024.9.0-alpha.4",
"2024.9.0-alpha.3",
"2024.9.0-alpha.2",
"2024.9.0-alpha.1",
"2024.9.0-alpha.0",
"2024.8.0",
"2024.8.0-rc.5",
"2024.8.0-rc.4",
"2024.8.0-rc.3",
"2024.8.0-beta.2",
"2024.8.0-alpha.1",
"2024.8.0-alpha.0",
"2024.7.0",
"2024.7.0-rc.8",
"2024.7.0-rc.7",
"2024.7.0-rc.6",
"2024.7.0-rc.5",
"2024.7.0-rc.4",
"2024.7.0-beta.3",
"2024.7.0-beta.2",
"2024.7.0-beta.1",
"2024.7.0-beta.0",
"2024.2.0-beta.13",
"2024.2.0-beta.12",
"2024.2.0-beta.10",
"2024.2.0-beta.9",
"2024.2.0-beta.8",
"2024.2.0-beta.7",
"2024.2.0-beta.6",
"2024.2.0-beta.5",
"2024.2.0-beta.4",
"2024.2.0-beta.3",
"2024.2.0-beta.2",
"2024.2.0-beta.1",
"2023.12.0-beta.6",
"2023.12.0-beta.5",
"2023.12.0-beta.4",
"2023.12.0-beta.3",
"2023.12.0-beta.2",
"2023.12.0-beta.1",
"2023.11.1-beta.2",
"2023.11.1-beta.1",
"2023.11.0-beta.10",
"2023.11.0-beta.9",
"2023.11.0-beta.8",
"2023.11.0-beta.7",
"2023.11.0-beta.6",
"2023.11.0-beta.5",
"2023.11.0-beta.4",
"2023.11.0-beta.3",
"2023.11.0-beta.2",
"2023.11.0-beta.1",
"2023.10.2-beta.2",
"2023.10.2-beta.1",
"2023.10.0-beta.15",
"2023.10.0-beta.14",
"2023.10.0-beta.13",
"2023.10.0-beta.12",
"2023.10.0-beta.11",
"2023.10.0-beta.10",
"2023.10.0-beta.9",
"2023.10.0-beta.8",
"2023.10.0-beta.7",
"2023.10.0-beta.6",
"2023.10.0-beta.5",
"2023.10.0-beta.4",
"2023.10.0-beta.3",
"2023.10.0-beta.2",
"2023.10.0-beta.1",
"2023.9.0-rc.4",
"2023.9.0-rc.3",
"2023.9.0-rc.2",
"2023.9.0-rc.1",
"2023.9.0-beta.11",
"2023.9.0-beta.10",
"2023.9.0-beta.9",
"2023.9.0-beta.8",
"2023.9.0-beta.7",
"2023.9.0-beta.6",
"2023.9.0-beta.5",
"2023.9.0-beta.4",
"2023.9.0-beta.3",
"2023.9.0-beta.2",
"2023.9.0-beta.1",
"13.14.0-beta.7",
"13.14.0-beta.6",
"13.14.0-beta.5",
"13.14.0-beta.4",
"13.14.0-beta.3",
"13.14.0-beta.2",
"13.14.0-beta.1",
"13.13.0-beta.7",
"13.13.0-beta.6",
"13.13.0-beta.5",
"13.13.0-beta.4",
"13.13.0-beta.3",
"13.13.0-beta.2",
"13.13.0-beta.1",
"13.12.0-beta.6",
"13.12.0-beta.5",
"13.12.0-beta.4",
"13.12.0-beta.3",
"13.12.0-beta.2",
"13.11.0-beta.8",
"13.11.0-beta.7",
"13.11.0-beta.6",
"13.11.0-beta.4",
"13.11.0.beta-3",
"13.11.0.beta-2",
"13.11.0.beta-1",
"13.0.0-rc.11",
"13.0.0-rc.10",
"13.0.0-rc.9",
"13.0.0-rc.8",
"13.0.0-rc.7",
"13.0.0-rc.6",
"13.0.0-rc.5",
"13.0.0-rc.3",
"13.0.0-rc.2",
"13.0.0-rc.1",
"13.0.0-beta.43",
"13.0.0-beta.42",
"13.0.0-beta.41",
"13.0.0-beta.40",
"13.0.0-beta.39",
"13.0.0-beta.38",
"13.0.0-beta.37",
"13.0.0-beta.36",
"13.0.0-beta.35",
"13.0.0-beta.34",
"13.0.0-beta.33",
"13.0.0-beta.32",
"13.0.0-beta.31",
"13.0.0-beta.30",
"13.0.0-beta.29",
"13.0.0-beta.28",
"13.0.0-beta.27",
"13.0.0-beta.26",
"13.0.0-beta.25",
"13.0.0-beta.24",
"13.0.0-beta.23",
"13.0.0-beta.22",
"13.0.0-beta.21",
"13.0.0-beta.16",
"12.67.1",
"12.67.0",
"12.66.0",
"12.65.7",
"12.65.6",
"12.65.5",
"12.65.4",
"12.65.3",
"12.65.2",
"12.65.1",
"12.65.0",
"12.64.2",
"12.64.1",
"12.64.0",
"12.63.0",
"12.62.2",
"12.62.1",
"12.62.0",
"12.61.1",
"12.61.0",
"12.60.1",
"12.60.0",
"12.59.0",
"12.58.0",
"12.57.4",
"12.57.1",
"12.57.0",
"12.56.0",
"12.55.0",
"12.54.0",
"12.53.0",
"12.52.0",
"12.51.0",
"12.50.0",
"12.49.1",
"12.49.0",
"12.48.3",
"12.48.2",
"12.48.1",
"12.48.0",
"12.47.1",
"12.47.0",
"12.46.0",
"12.45.1",
"12.45.0",
"12.44.1",
"12.44.0",
"12.43.0",
"12.42.0",
"12.41.3",
"12.41.2",
"12.41.1",
"12.41.0",
"12.40.0",
"12.39.1",
"12.39.0",
"12.38.1",
"12.38.0",
"12.37.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47746.json"
}
}
],
"modified": "2026-10-28T02:30:28.941253180Z",
"provider": "osv",
"references": [
"https://github.com/misskey-dev/misskey/releases/tag/2026.5.4",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47746.json",
"https://github.com/misskey-dev/misskey/security/advisories/GHSA-38jx-423m-g387",
"https://nvd.nist.gov/vuln/detail/CVE-2026-47746"
],
"provider_metadata": {
"cwe_ids": [
"CWE-367"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47746.json"
}
},
"related_cves": [
{
"value": "CVE-2026-47746",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 495854,
"published_at": "2026-08-03T21:56:40.198+00:00"
}