214 lines
11 KiB
JSON
214 lines
11 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-2026-42533",
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"assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
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"state": "PUBLISHED",
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"assignerShortName": "f5",
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"dateReserved": "2026-05-05T21:19:09.517Z",
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"datePublished": "2026-07-15T14:33:45.810Z",
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"dateUpdated": "2026-11-03T22:13:24.275Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
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"shortName": "f5",
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"dateUpdated": "2026-07-15T21:20:26.156Z"
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},
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"title": "NGINX Map directive and Regex matching vulnerability",
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"datePublic": "2026-07-15T14:00:00.000Z",
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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-122",
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"description": "CWE-122 Heap-based Buffer Overflow",
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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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"affected": [
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{
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"vendor": "F5",
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"product": "NGINX Plus",
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"modules": [
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"map directive with regex matching"
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],
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"versions": [
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{
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"status": "affected",
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"version": "37.0.0.1",
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"lessThan": "37.0.3.1",
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"versionType": "custom"
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},
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{
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"status": "affected",
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"version": "R36",
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"lessThan": "R36 P7",
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"versionType": "custom"
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},
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{
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"status": "affected",
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"version": "R33",
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"lessThan": "*",
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"versionType": "custom"
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}
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],
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"defaultStatus": "unknown"
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},
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{
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"vendor": "F5",
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"product": "NGINX Open Source",
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"modules": [
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"map directive with regex matching"
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],
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"versions": [
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{
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"status": "affected",
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"version": "1.31.2",
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"lessThan": "1.31.3",
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"versionType": "custom"
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},
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{
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"status": "affected",
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"version": "0.9.6",
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"lessThan": "1.30.4",
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"versionType": "custom"
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}
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],
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"defaultStatus": "unknown"
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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": "A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and a string expression references the map's regex capture variables before referencing the map output variable. Alternatively, the same result could be achieved by using a non-cacheable variable in a string expression under certain conditions. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR.\n\nImpact:\nThis vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or to possibly trigger a code execution. There is no control plane exposure; this is a data plane issue only.\n\n\n\n\n Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.",
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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": "<p>A vulnerability exists in NGINX Plus and NGINX Open Source when a <strong>map</strong> directive uses regex matching and a string expression references the map's regex capture variables before referencing the map output variable. Alternatively, the same result could be achieved by using a non-cacheable variable in a string expression under certain conditions. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR.</p>Impact:<br>This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or to possibly trigger a code execution. There is no control plane exposure; this is a data plane issue only.<br>\n\n\n<br> Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
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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://my.f5.com/manage/s/article/K000162097",
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"tags": [
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"vendor-advisory",
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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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"cvssV3_1": {
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"version": "3.1",
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"attackVector": "NETWORK",
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"attackComplexity": "HIGH",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"scope": "UNCHANGED",
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"confidentialityImpact": "HIGH",
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"integrityImpact": "HIGH",
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"availabilityImpact": "HIGH",
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"baseSeverity": "HIGH",
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"baseScore": 8.1,
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"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
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}
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},
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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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"version": "4.0",
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"attackVector": "NETWORK",
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"attackComplexity": "HIGH",
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"attackRequirements": "NONE",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"vulnConfidentialityImpact": "HIGH",
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"subConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "HIGH",
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"subIntegrityImpact": "NONE",
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"vulnAvailabilityImpact": "HIGH",
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"subAvailabilityImpact": "NONE",
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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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"baseSeverity": "CRITICAL",
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"baseScore": 9.2,
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"vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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": "F5 acknowledges Ming Xuan, DKD (@pidifn), Ji'an Zhou, and Zhen Yan of AntAISecurityLab, Rafael Gacek, Sergii Negodiuk of EVO.company, Lam Jun Rong of Calif.io, Mufeed VH of Winfunc Research (winfunc.com), Vexera AI (https://vexera.ai), Tu Tran Dinh (@1w4y), Stan Shaw (cyberstan), qianshuidewajueji, zenneth (randomguy6407), Zhenpeng (Leo) Lin of depthfirst, Lukas Johannes Moeller, Melih Tolga Sahin of Vodafone Türkiye, Ayoub Nabil Boubagrat (GitHub: @ayoubnabil), and Milan Jovic (Kljunowsky) for independently bringing this issue to our attention and following the highest standards of coordinated disclosure.",
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"type": "reporter"
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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": "F5 SIRTBot v1.0"
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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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"id": "CVE-2026-42533",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "poc"
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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": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-07-29T03:55:25.631530Z"
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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": "2026-11-03T22:13:24.275Z"
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}
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}
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]
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}
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} |