CVE-2026-45983
📛 CVE Title
nfsd: never defer requests during idmap lookup
Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: never defer requests during idmap lookup During v4 request compound arg decoding, some ops (e.g. SETATTR) can trigger idmap lookup upcalls. When those upcall responses get delayed beyond the allowed time limit, cache_check() will mark the request for deferral and cause it to be dropped. This prevents nfs4svc_encode_compoundres from being executed, and thus the session slot flag NFSD4_SLOT_INUSE never gets cleared. Subsequent client requests will fail with NFSERR_JUKEBOX, given that the slot will be marked as in-use, making the SEQUENCE op fail. Fix this by making sure that the RQ_USEDEFERRAL flag is always clear during nfs4svc_decode_compoundargs(), since no v4 request should ever be deferred.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- Linux
- CVSS severity
- high
- CVSS score
- 8.4 / 10
- CVSS vector
AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Effective score
- 8.4 / 10 HIGH source: CNA overview
- CWE(s)
- —
- Reserved
- 2026-05-13
- Published
- 2026-05-27 12:18 UTC
- Last updated
- 2026-05-27 12:18 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/45xxx/CVE-2026-45983.json
- Linked Threat
- CVE-2026-45983 — CVE-2026-45983
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-05-27 14:17:15 UTC
- NVD last modified
- 2026-06-17 10:52:50 UTC
- NVD CVSS v3.1
- 5.5 / 10 MEDIUM source: nvd@nist.gov
- NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H- Exploitability subscore
- 1.8 / 10
- Impact subscore
- 3.6 / 10
- EPSS score
- 0.0012 (probability of exploitation in next 30 days)
- EPSS percentile
- 2.42% vs all CVEs — higher = more likely to be exploited, as of 2026-08-01
NVD / KEV / EPSS data refreshed 2026-08-01 17:12 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-32268 - Assigner
- Linux
- Published
- May 27, 2026, 12:18:41 PM
- Updated
- May 27, 2026, 12:18:41 PM
- EUVD base score
- 0.0 / 10
- EUVD-reported EPSS
- 0.1200
- Vendors
- Linux
- Products
-
Linux (patch: 0)Linux (2f425878b6a71571341dcd3f9e9d1a6f6355da9c <99e17b20fddac19a228d213e00f6b9e1c10daff9)Linux (2f425878b6a71571341dcd3f9e9d1a6f6355da9c <3a72c7dedc99b321e0f267e4e999e5baf07c4593)Linux (patch: 6.18.14)Linux (patch: 6.12.75)Linux (patch: 6.6.128)Linux (patch: 5.10.252)Linux (2f425878b6a71571341dcd3f9e9d1a6f6355da9c <d75ec4504a4340b033b15cad0303988b3089dd93)Linux (patch: 7.0)Linux (patch: 5.15.202)Linux (patch: 6.19.4)Linux (2.6.30)Linux (2f425878b6a71571341dcd3f9e9d1a6f6355da9c <063a6f22478ef929625000a2caf54667725c1dfd)Linux (patch: 6.1.165)Linux (2f425878b6a71571341dcd3f9e9d1a6f6355da9c <243f71ed873ff3feeb6f9b5cb145d63f7188b4c4)Linux (2f425878b6a71571341dcd3f9e9d1a6f6355da9c <f9c206cdc4266caad6a9a7f46341420a10f03ccb)Linux (2f425878b6a71571341dcd3f9e9d1a6f6355da9c <8dff54fe88c0dcd4c55bff9fc2fa6ca968290826)Linux (2f425878b6a71571341dcd3f9e9d1a6f6355da9c <b9abb760db20504240a7147f27934d900cd80b23)
- Aliases
-
GHSA-wrmj-c6w7-44cr
ENISA description: In the Linux kernel, the following vulnerability has been resolved: nfsd: never defer requests during idmap lookup During v4 request compound arg decoding, some ops (e.g. SETATTR) can trigger idmap lookup upcalls. When those upcall responses get delayed beyond the allowed time limit, cache_check() will mark the request for deferral and cause it to be dropped. This prevents nfs4svc_encode_compoundres from being executed, and thus the session slot flag NFSD4_SLOT_INUSE never gets cleared. Subsequent client requests will fail with NFSERR_JUKEBOX, given that the slot will be marked as in-use, making the SEQUENCE op fail. Fix this by making sure that the RQ_USEDEFERRAL flag is always clear during nfs4svc_decode_compoundargs(), since no v4 request should ever be deferred.
EUVD references (8)
- https://git.kernel.org/stable/c/b9abb760db20504240a7147f27934d900cd80b23
- https://git.kernel.org/stable/c/3a72c7dedc99b321e0f267e4e999e5baf07c4593
- https://git.kernel.org/stable/c/99e17b20fddac19a228d213e00f6b9e1c10daff9
- https://git.kernel.org/stable/c/243f71ed873ff3feeb6f9b5cb145d63f7188b4c4
- https://git.kernel.org/stable/c/063a6f22478ef929625000a2caf54667725c1dfd
- https://git.kernel.org/stable/c/d75ec4504a4340b033b15cad0303988b3089dd93
- https://git.kernel.org/stable/c/8dff54fe88c0dcd4c55bff9fc2fa6ca968290826
- https://git.kernel.org/stable/c/f9c206cdc4266caad6a9a7f46341420a10f03ccb
Affected products (2)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| Linux | Linux |
2f425878b6a71571341dcd3f9e9d1a6f6355da9c (affected),
2f425878b6a71571341dcd3f9e9d1a6f6355da9c (affected),
2f425878b6a71571341dcd3f9e9d1a6f6355da9c (affected),
2f425878b6a71571341dcd3f9e9d1a6f6355da9c (affected),
2f425878b6a71571341dcd3f9e9d1a6f6355da9c (affected),
2f425878b6a71571341dcd3f9e9d1a6f6355da9c (affected),
2f425878b6a71571341dcd3f9e9d1a6f6355da9c (affected),
2f425878b6a71571341dcd3f9e9d1a6f6355da9c (affected)
|
— |
| Linux | Linux |
2.6.30 (affected),
0 (unaffected),
5.10.252 (unaffected),
5.15.202 (unaffected),
6.1.165 (unaffected),
6.6.128 (unaffected),
6.12.75 (unaffected),
6.18.14 (unaffected),
6.19.4 (unaffected),
7.0 (unaffected)
|
— |
Affected products — CPE 2.3 (1) NVD
NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendor references (8)
References embedded in the original CVE record by the assigning CNA.
- https://git.kernel.org/stable/c/b9abb760db20504240a7147f27934d900cd80b23
- https://git.kernel.org/stable/c/3a72c7dedc99b321e0f267e4e999e5baf07c4593
- https://git.kernel.org/stable/c/99e17b20fddac19a228d213e00f6b9e1c10daff9
- https://git.kernel.org/stable/c/243f71ed873ff3feeb6f9b5cb145d63f7188b4c4
- https://git.kernel.org/stable/c/063a6f22478ef929625000a2caf54667725c1dfd
- https://git.kernel.org/stable/c/d75ec4504a4340b033b15cad0303988b3089dd93
- https://git.kernel.org/stable/c/8dff54fe88c0dcd4c55bff9fc2fa6ca968290826
- https://git.kernel.org/stable/c/f9c206cdc4266caad6a9a7f46341420a10f03ccb
Web references (11)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://git.kernel.org/stable/c/063a6f22478ef929625000a2caf54667725c1dfd tenable:git.kernel.org
- https://git.kernel.org/stable/c/243f71ed873ff3feeb6f9b5cb145d63f7188b4c4 tenable:git.kernel.org
- https://git.kernel.org/stable/c/3a72c7dedc99b321e0f267e4e999e5baf07c4593 tenable:git.kernel.org
- https://git.kernel.org/stable/c/8dff54fe88c0dcd4c55bff9fc2fa6ca968290826 tenable:git.kernel.org
- https://git.kernel.org/stable/c/99e17b20fddac19a228d213e00f6b9e1c10daff9 tenable:git.kernel.org
- https://git.kernel.org/stable/c/b9abb760db20504240a7147f27934d900cd80b23 tenable:git.kernel.org
- https://git.kernel.org/stable/c/d75ec4504a4340b033b15cad0303988b3089dd93 tenable:git.kernel.org
- https://git.kernel.org/stable/c/f9c206cdc4266caad6a9a7f46341420a10f03ccb tenable:git.kernel.org
- https://nvd.nist.gov/vuln/detail/CVE-2026-45983 tenable:nvd.nist.gov
- https://www.cve.org/CVERecord?id=CVE-2026-45983 tenable:www.cve.org
- https://www.first.org/epss/ tenable:www.first.org
NVD-tagged references (8)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://git.kernel.org/stable/c/063a6f22478ef929625000a2caf54667725c1dfd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
- https://git.kernel.org/stable/c/243f71ed873ff3feeb6f9b5cb145d63f7188b4c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
- https://git.kernel.org/stable/c/3a72c7dedc99b321e0f267e4e999e5baf07c4593 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
- https://git.kernel.org/stable/c/8dff54fe88c0dcd4c55bff9fc2fa6ca968290826 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
- https://git.kernel.org/stable/c/99e17b20fddac19a228d213e00f6b9e1c10daff9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
- https://git.kernel.org/stable/c/b9abb760db20504240a7147f27934d900cd80b23 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
- https://git.kernel.org/stable/c/d75ec4504a4340b033b15cad0303988b3089dd93 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
- https://git.kernel.org/stable/c/f9c206cdc4266caad6a9a7f46341420a10f03ccb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
Remediations (18)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:blog.qualys.com
With Qualys Policy Audit's out-of-the-box mitigation or Compensatory Controls, which reduce the risk of a vulnerability being exploited because the remediation ( fix / patch ) cannot be done immediately, these security controls are not recommended by any industry standards, such as CIS and DISA-STIG.
2026-06-04 00:14 UTC -
web:cybersecuritynews.com
Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.
2026-06-04 00:14 UTC -
web:op-c.net
CISA added two actively exploited Microsoft Defender vulnerabilities, CVE - 2026 -41091 and CVE - 2026 -45498, to its KEV catalog. Learn the risks and recommended actions.
2026-06-04 00:14 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-06-04 00:14 UTC -
web:www.crowdstrike.com
Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.
2026-06-04 00:14 UTC -
web:www.malwarebytes.com
The KEV catalog tracks vulnerabilities known to be exploited in the wild and sets patch deadlines for Federal Civilian Executive Branch (FCEB) agencies. Five of the added vulnerabilities are quite old by vulnerability standards. Patches were released in 2008, 2009, and 2010. But the Microsoft Defender vulnerabilities are from this year. Those ...
2026-06-04 00:14 UTC -
web:www.oracle.com
Oracle Critical Patch Update Advisory - April 2026 Description A Critical Patch Update is a collection of patches for multiple security vulnerabilities. These patches address vulnerabilities in Oracle code and in third party components included in Oracle products. These patches are usually cumulative, but each advisory describes only the security patches added since the previous Critical Patch ...
2026-06-04 00:14 UTC -
web:www.pdq.com
May 2026 Patch Tuesday is here, and PDQ is back with another recap. Will we see another month of increased CVE volume? Is AI to blame? Dive in to learn more.
2026-06-04 00:14 UTC -
web:www.techradar.com
Microsoft patches two actively exploited zero‑day flaws in Defender, tracked as CVE‑2026‑41091 (privilege escalation) and CVE‑2026‑45498 (denial of service) Updates were shipped ...
2026-06-04 00:14 UTC -
web:zecurit.com
Get the complete breakdown of Microsoft's June 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .
2026-06-04 00:14 UTC -
web:cybersecuritynews.com
No patch has been released yet; Microsoft has instead issued a multi-step manual mitigation guide while a formal security update is prepared. Windows BitLocker Security Bypass The vulnerability originates in WinRE's handling of the BootExecute registry value under HKLM\ControlSet001\Control\Session Manager.
2026-06-19 02:27 UTC -
web:nvd.nist.gov
An official website of the United States government NVD MENU
2026-06-19 02:27 UTC -
web:support.microsoft.com
The following summary outlines key issues addressed by this update. The bold text within the brackets indicates the item or area of the change. [Networking] Fixed: This update addresses a security issue in the Windows Routing and Remote Access Service (RRAS) management tool. If you connect to a malicious remote server, an attacker could disrupt the tool or run code on your device. For more ...
2026-06-19 02:27 UTC -
web:www.oracle.com
This Critical Security Patch Update contains 35 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Security Patch Update and other Oracle Software Security Assurance activities is located at May 2026 Critical Security Patch Update: Executive Summary and Analysis.
2026-06-19 02:27 UTC -
web:www.rapid7.com
Microsoft is publishing 200 vulnerabilities on June 2026 Patch Tuesday, including an HTTP/2 denial of service vulnerability and an elevation of privilege vulnerability in PowerToys.
2026-06-19 02:27 UTC -
web:www.tenable.com
Oracle addresses 241 CVEs in its April Critical Patch Update, the second quarterly update of 2026 with 481 patches, including 34 critical updates.
2026-06-19 02:27 UTC -
web:www.veeam.com
When a vulnerability is identified, our team promptly develops a patch to address and mitigate the risk. In line with our dedication to transparency, we publicly disclose the vulnerability and provide detailed mitigation information.
2026-06-19 02:27 UTC -
web:www.veeam.com
When a vulnerability is identified, our team promptly develops a patch to address and mitigate the risk. In line with our dedication to transparency, we publicly disclose the vulnerability and provide detailed mitigation information.
2026-06-19 02:27 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-45983.json.
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/nfsd/nfs4idmap.c",
"fs/nfsd/nfs4proc.c",
"fs/nfsd/nfs4xdr.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "b9abb760db20504240a7147f27934d900cd80b23",
"status": "affected",
"version": "2f425878b6a71571341dcd3f9e9d1a6f6355da9c",
"versionType": "git"
},
{
"lessThan": "3a72c7dedc99b321e0f267e4e999e5baf07c4593",
"status": "affected",
"version": "2f425878b6a71571341dcd3f9e9d1a6f6355da9c",
"versionType": "git"
},
{
"lessThan": "99e17b20fddac19a228d213e00f6b9e1c10daff9",
"status": "affected",
"version": "2f425878b6a71571341dcd3f9e9d1a6f6355da9c",
"versionType": "git"
},
{
"lessThan": "243f71ed873ff3feeb6f9b5cb145d63f7188b4c4",
"status": "affected",
"version": "2f425878b6a71571341dcd3f9e9d1a6f6355da9c",
"versionType": "git"
},
{
"lessThan": "063a6f22478ef929625000a2caf54667725c1dfd",
"status": "affected",
"version": "2f425878b6a71571341dcd3f9e9d1a6f6355da9c",
"versionType": "git"
},
{
"lessThan": "d75ec4504a4340b033b15cad0303988b3089dd93",
"status": "affected",
"version": "2f425878b6a71571341dcd3f9e9d1a6f6355da9c",
"versionType": "git"
},
{
"lessThan": "8dff54fe88c0dcd4c55bff9fc2fa6ca968290826",
"status": "affected",
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"versionType": "git"
},
{
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"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/nfsd/nfs4idmap.c",
"fs/nfsd/nfs4proc.c",
"fs/nfsd/nfs4xdr.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.30"
},
{
"lessThan": "2.6.30",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.252",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.202",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.165",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.128",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.75",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.14",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.252",
"versionStartIncluding": "2.6.30",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.202",
"versionStartIncluding": "2.6.30",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.165",
"versionStartIncluding": "2.6.30",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.128",
"versionStartIncluding": "2.6.30",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.75",
"versionStartIncluding": "2.6.30",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.14",
"versionStartIncluding": "2.6.30",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.4",
"versionStartIncluding": "2.6.30",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0",
"versionStartIncluding": "2.6.30",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: never defer requests during idmap lookup\n\nDuring v4 request compound arg decoding, some ops (e.g. SETATTR)\ncan trigger idmap lookup upcalls. When those upcall responses get\ndelayed beyond the allowed time limit, cache_check() will mark the\nrequest for deferral and cause it to be dropped.\n\nThis prevents nfs4svc_encode_compoundres from being executed, and\nthus the session slot flag NFSD4_SLOT_INUSE never gets cleared.\nSubsequent client requests will fail with NFSERR_JUKEBOX, given\nthat the slot will be marked as in-use, making the SEQUENCE op\nfail.\n\nFix this by making sure that the RQ_USEDEFERRAL flag is always\nclear during nfs4svc_decode_compoundargs(), since no v4 request\nshould ever be deferred."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-27T12:18:41.619Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/b9abb760db20504240a7147f27934d900cd80b23"
},
{
"url": "https://git.kernel.org/stable/c/3a72c7dedc99b321e0f267e4e999e5baf07c4593"
},
{
"url": "https://git.kernel.org/stable/c/99e17b20fddac19a228d213e00f6b9e1c10daff9"
},
{
"url": "https://git.kernel.org/stable/c/243f71ed873ff3feeb6f9b5cb145d63f7188b4c4"
},
{
"url": "https://git.kernel.org/stable/c/063a6f22478ef929625000a2caf54667725c1dfd"
},
{
"url": "https://git.kernel.org/stable/c/d75ec4504a4340b033b15cad0303988b3089dd93"
},
{
"url": "https://git.kernel.org/stable/c/8dff54fe88c0dcd4c55bff9fc2fa6ca968290826"
},
{
"url": "https://git.kernel.org/stable/c/f9c206cdc4266caad6a9a7f46341420a10f03ccb"
}
],
"title": "nfsd: never defer requests during idmap lookup",
"x_generator": {
"engine": "bippy-1.2.0"
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}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-45983",
"datePublished": "2026-05-27T12:18:41.619Z",
"dateReserved": "2026-05-13T15:03:33.090Z",
"dateUpdated": "2026-05-27T12:18:41.619Z",
"state": "PUBLISHED"
},
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"dataVersion": "5.2"
}