201 lines
8.9 KiB
JSON
201 lines
8.9 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-81535",
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"assignerOrgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
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"state": "PUBLISHED",
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"assignerShortName": "wolfSSL",
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"dateReserved": "2026-08-26T23:09:37.634Z",
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"datePublished": "2026-10-07T02:39:27.830Z",
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"dateUpdated": "2026-10-07T18:37:36.186Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
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"shortName": "wolfSSL",
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"dateUpdated": "2026-10-07T02:39:27.830Z"
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},
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"title": "wolfSSH SSH client accepts unsolicited forwarded-tcpip channel opens without an authorization check",
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"cweId": "CWE-862",
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"description": "CWE-862 Missing Authorization",
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"type": "CWE"
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}
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]
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},
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{
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"descriptions": [
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{
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"lang": "en",
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"cweId": "CWE-863",
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"description": "CWE-863 Incorrect Authorization",
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"type": "CWE"
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}
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]
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-130",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-130 Excessive Allocation"
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}
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]
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}
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],
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"affected": [
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{
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"vendor": "wolfSSL Inc.",
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"product": "wolfSSH",
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"repo": "https://github.com/wolfSSL/wolfssh",
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"modules": [
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"forwarding"
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],
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"programFiles": [
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"src/internal.c"
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],
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"versions": [
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{
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"status": "affected",
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"version": "1.4.8",
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"lessThanOrEqual": "1.5.0",
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"changes": [
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{
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"at": "1.6.0",
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"status": "unaffected"
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}
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],
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"versionType": "semver"
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}
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],
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"defaultStatus": "unaffected"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"value": "In wolfSSH through 1.5.0 built with --enable-fwd, DoChannelOpen() in src/internal.c gates only direct-tcpip channel opens with the forwarding policy callback. forwarded-tcpip opens are admitted without an authorization check and are not capped in number, allowing a malicious SSH peer to make an endpoint allocate unbounded per-channel buffers for forwarding channels the application never authorized. A client also does not check a forwarded-tcpip open against the forwards it registered with a tcpip-forward request, as RFC 4254 section 7.2 requires, so a malicious server can open forwarding channels for addresses and ports the client never asked it to forward.",
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"supportingMedia": [
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{
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"type": "text/html",
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"base64": false,
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"value": "In wolfSSH through 1.5.0 built with <code>--enable-fwd</code>, <code>DoChannelOpen()</code> in <code>src/internal.c</code> gates only <code>direct-tcpip</code> channel opens with the forwarding policy callback. <code>forwarded-tcpip</code> opens are admitted without an authorization check and are not capped in number, allowing a malicious SSH peer to make an endpoint allocate unbounded per-channel buffers for forwarding channels the application never authorized. A client also does not check a <code>forwarded-tcpip</code> open against the forwards it registered with a <code>tcpip-forward</code> request, as RFC 4254 section 7.2 requires, so a malicious server can open forwarding channels for addresses and ports the client never asked it to forward.<br>"
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}
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]
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}
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],
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"references": [
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{
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"url": "https://github.com/wolfSSL/wolfssh/commit/616eb681e70759c30c3ba158f2b18d7bd954def8",
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"tags": [
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"patch"
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]
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},
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{
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"url": "https://github.com/wolfSSL/wolfssh/commit/e396a0a4b6b367f10270287446a4be0071742b5c",
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"name": "Fix commit e396a0a4 (match forwarded-tcpip opens to registered forwards, PR #1148)",
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"tags": [
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"patch"
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]
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},
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{
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"url": "https://github.com/wolfSSL/wolfssh/commit/79a7f299337a28aa561409688a268d0efe6e295c",
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"name": "Fix commit 79a7f299 (match forwarded-tcpip on every client session, PR #1220)",
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"tags": [
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"patch"
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]
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}
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],
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"metrics": [
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{
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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],
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"cvssV4_0": {
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"attackVector": "NETWORK",
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"attackComplexity": "LOW",
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"attackRequirements": "PRESENT",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"vulnConfidentialityImpact": "NONE",
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"subConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"vulnAvailabilityImpact": "LOW",
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"subAvailabilityImpact": "NONE",
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"exploitMaturity": "NOT_DEFINED",
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"Safety": "NOT_DEFINED",
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"Automatable": "NOT_DEFINED",
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"Recovery": "NOT_DEFINED",
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"valueDensity": "NOT_DEFINED",
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"vulnerabilityResponseEffort": "NOT_DEFINED",
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"providerUrgency": "NOT_DEFINED",
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"version": "4.0",
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"baseSeverity": "MEDIUM",
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"baseScore": 6.3,
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
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}
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}
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],
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"credits": [
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{
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"lang": "en",
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"value": "zhangph (GitHub afldl)",
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"type": "finder"
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}
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],
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"source": {
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"discovery": "EXTERNAL"
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},
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"x_generator": {
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"engine": "Vulnogram 1.0.5"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-10-07T18:37:10.078645Z",
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"id": "CVE-2026-81535",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-07T18:37:36.186Z"
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}
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}
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]
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}
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} |