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4 vulnerabilities found for Reactor Core by Spring
CVE-2026-47863 (GCVE-0-2026-47863)
Vulnerability from nvd – Published: 2026-08-26 23:28 – Updated: 2026-08-26 23:28
VLAI
EPSS
VEX
Title
Reactor Core bufferTimeout fair-backpressure pipeline permanently hangs when upstream delivers items during an active flush
Summary
In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.
Reactor Core 3.8.0 - 3.8.6
Reactor Core 3.7.19 and earlier
Severity
5.9 (Medium)
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Spring | Reactor Core |
Affected:
3.8.0 , ≤ 3.8.6
(custom)
Affected: 0 , ≤ 3.7.19 (custom) |
{
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"cna": {
"affected": [
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"product": "Reactor Core",
"vendor": "Spring",
"versions": [
{
"lessThanOrEqual": "3.8.6",
"status": "affected",
"version": "3.8.0",
"versionType": "custom"
},
{
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"status": "affected",
"version": "0",
"versionType": "custom"
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],
"descriptions": [
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"supportingMedia": [
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"value": "\u003cp\u003eIn Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.\u003c/p\u003e\u003cp\u003eReactor Core 3.8.0 - 3.8.6\u003cbr/\u003eReactor Core 3.7.19 and earlier\u003c/p\u003e"
}
],
"value": "In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.\nReactor Core 3.8.0 - 3.8.6\nReactor Core 3.7.19 and earlier"
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition."
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-835 Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-26T23:28:48.599Z",
"orgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d",
"shortName": "vmware"
},
"references": [
{
"url": "https://spring.io/security/cve-2026-47863"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Reactor Core bufferTimeout fair-backpressure pipeline permanently hangs when upstream delivers items during an active flush"
}
},
"cveMetadata": {
"assignerOrgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d",
"assignerShortName": "vmware",
"cveId": "CVE-2026-47863",
"datePublished": "2026-08-26T23:28:48.599Z",
"dateReserved": "2026-05-20T10:00:55.157Z",
"dateUpdated": "2026-08-26T23:28:48.599Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-47857 (GCVE-0-2026-47857)
Vulnerability from nvd – Published: 2026-08-26 23:28 – Updated: 2026-08-26 23:28
VLAI
EPSS
VEX
Title
Reactor Core windowTimeout fair-backpressure stream hang due to 20-bit index wrap-around
Summary
In Reactor Core, applications that use the Flux.windowTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.
Reactor Core 3.8.0 - 3.8.6
Reactor Core 3.5.0 - 3.7.19
Reactor Core 3.4.41 and earlier
Severity
5.9 (Medium)
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Spring | Reactor Core |
Affected:
3.8.0 , ≤ 3.8.6
(custom)
Affected: 3.5.0 , ≤ 3.7.19 (custom) Affected: 0 , ≤ 3.4.41 (custom) |
{
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"affected": [
{
"defaultStatus": "unaffected",
"product": "Reactor Core",
"vendor": "Spring",
"versions": [
{
"lessThanOrEqual": "3.8.6",
"status": "affected",
"version": "3.8.0",
"versionType": "custom"
},
{
"lessThanOrEqual": "3.7.19",
"status": "affected",
"version": "3.5.0",
"versionType": "custom"
},
{
"lessThanOrEqual": "3.4.41",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eIn Reactor Core, applications that use the Flux.windowTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.\u003c/p\u003e\u003cp\u003eReactor Core 3.8.0 - 3.8.6\u003cbr/\u003eReactor Core 3.5.0 - 3.7.19\u003cbr/\u003eReactor Core 3.4.41 and earlier\u003c/p\u003e"
}
],
"value": "In Reactor Core, applications that use the Flux.windowTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.\nReactor Core 3.8.0 - 3.8.6\nReactor Core 3.5.0 - 3.7.19\nReactor Core 3.4.41 and earlier"
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "In Reactor Core, applications that use the Flux.windowTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition."
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-190 Integer Overflow or Wraparound",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-26T23:28:44.743Z",
"orgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d",
"shortName": "vmware"
},
"references": [
{
"url": "https://spring.io/security/cve-2026-47857"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Reactor Core windowTimeout fair-backpressure stream hang due to 20-bit index wrap-around"
}
},
"cveMetadata": {
"assignerOrgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d",
"assignerShortName": "vmware",
"cveId": "CVE-2026-47857",
"datePublished": "2026-08-26T23:28:44.743Z",
"dateReserved": "2026-05-20T10:00:55.156Z",
"dateUpdated": "2026-08-26T23:28:44.743Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-47863 (GCVE-0-2026-47863)
Vulnerability from cvelistv5 – Published: 2026-08-26 23:28 – Updated: 2026-08-26 23:28
VLAI
EPSS
VEX
Title
Reactor Core bufferTimeout fair-backpressure pipeline permanently hangs when upstream delivers items during an active flush
Summary
In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.
Reactor Core 3.8.0 - 3.8.6
Reactor Core 3.7.19 and earlier
Severity
5.9 (Medium)
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Spring | Reactor Core |
Affected:
3.8.0 , ≤ 3.8.6
(custom)
Affected: 0 , ≤ 3.7.19 (custom) |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Reactor Core",
"vendor": "Spring",
"versions": [
{
"lessThanOrEqual": "3.8.6",
"status": "affected",
"version": "3.8.0",
"versionType": "custom"
},
{
"lessThanOrEqual": "3.7.19",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eIn Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.\u003c/p\u003e\u003cp\u003eReactor Core 3.8.0 - 3.8.6\u003cbr/\u003eReactor Core 3.7.19 and earlier\u003c/p\u003e"
}
],
"value": "In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.\nReactor Core 3.8.0 - 3.8.6\nReactor Core 3.7.19 and earlier"
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition."
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-835 Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-26T23:28:48.599Z",
"orgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d",
"shortName": "vmware"
},
"references": [
{
"url": "https://spring.io/security/cve-2026-47863"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Reactor Core bufferTimeout fair-backpressure pipeline permanently hangs when upstream delivers items during an active flush"
}
},
"cveMetadata": {
"assignerOrgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d",
"assignerShortName": "vmware",
"cveId": "CVE-2026-47863",
"datePublished": "2026-08-26T23:28:48.599Z",
"dateReserved": "2026-05-20T10:00:55.157Z",
"dateUpdated": "2026-08-26T23:28:48.599Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-47857 (GCVE-0-2026-47857)
Vulnerability from cvelistv5 – Published: 2026-08-26 23:28 – Updated: 2026-08-26 23:28
VLAI
EPSS
VEX
Title
Reactor Core windowTimeout fair-backpressure stream hang due to 20-bit index wrap-around
Summary
In Reactor Core, applications that use the Flux.windowTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.
Reactor Core 3.8.0 - 3.8.6
Reactor Core 3.5.0 - 3.7.19
Reactor Core 3.4.41 and earlier
Severity
5.9 (Medium)
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Spring | Reactor Core |
Affected:
3.8.0 , ≤ 3.8.6
(custom)
Affected: 3.5.0 , ≤ 3.7.19 (custom) Affected: 0 , ≤ 3.4.41 (custom) |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Reactor Core",
"vendor": "Spring",
"versions": [
{
"lessThanOrEqual": "3.8.6",
"status": "affected",
"version": "3.8.0",
"versionType": "custom"
},
{
"lessThanOrEqual": "3.7.19",
"status": "affected",
"version": "3.5.0",
"versionType": "custom"
},
{
"lessThanOrEqual": "3.4.41",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"descriptions": [
{
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"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eIn Reactor Core, applications that use the Flux.windowTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.\u003c/p\u003e\u003cp\u003eReactor Core 3.8.0 - 3.8.6\u003cbr/\u003eReactor Core 3.5.0 - 3.7.19\u003cbr/\u003eReactor Core 3.4.41 and earlier\u003c/p\u003e"
}
],
"value": "In Reactor Core, applications that use the Flux.windowTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.\nReactor Core 3.8.0 - 3.8.6\nReactor Core 3.5.0 - 3.7.19\nReactor Core 3.4.41 and earlier"
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "In Reactor Core, applications that use the Flux.windowTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition."
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
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},
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{
"lang": "en",
"value": "GENERAL"
}
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}
],
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{
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{
"description": "CWE-190 Integer Overflow or Wraparound",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-26T23:28:44.743Z",
"orgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d",
"shortName": "vmware"
},
"references": [
{
"url": "https://spring.io/security/cve-2026-47857"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Reactor Core windowTimeout fair-backpressure stream hang due to 20-bit index wrap-around"
}
},
"cveMetadata": {
"assignerOrgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d",
"assignerShortName": "vmware",
"cveId": "CVE-2026-47857",
"datePublished": "2026-08-26T23:28:44.743Z",
"dateReserved": "2026-05-20T10:00:55.156Z",
"dateUpdated": "2026-08-26T23:28:44.743Z",
"state": "PUBLISHED"
},
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