CVE-2026-47863

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Source
https://cve.org/CVERecord?id=CVE-2026-47863
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47863.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-47863
Downstream
CLEANSTART (1)
CLSA (15)
Published
2026-08-26T23:28:48Z
Modified
2026-10-20T12:00:50Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Reactor Core bufferTimeout fair-backpressure pipeline permanently hangs when upstream delivers items during an active flush
Details

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

Database specific 
{
    "cna_assigner":  "vmware",
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47863.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "introduced":  "3.8.0"
                },
                {
                    "last_affected":  "3.8.6"
                },
                {
                    "last_affected":  "3.7.19"
                }
            ],
            "source":  "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/reactor/reactor-core

Affected ranges

Type
GIT
Repo
https://github.com/reactor/reactor-core
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last Affected
c84e170e12d78dc4c895d4b25bba2eb3a712e10d
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "last_affected":  "3.7.19"
                }
            ],
            "source":  "DESCRIPTION"
        }
    ]
}

Affected versions

v2.*
v2.5.0.M1
v2.5.0.M2
v2.5.0.M3
v2.5.0.M4
v3.*
v3.0.0.RC1
v3.0.0.RC2
v3.0.0.RELEASE
v3.0.1.RELEASE
v3.0.2.RELEASE
v3.0.3.RELEASE
v3.0.4.RELEASE
v3.0.5.RELEASE
v3.0.6.RELEASE
v3.1.0.M1
v3.1.0.M2
v3.1.0.RELEASE
v3.1.1.RELEASE
v3.1.2.RELEASE
v3.1.3.RELEASE
v3.1.4.RELEASE
v3.2.0.M2
v3.2.0.M3
v3.2.0.M4
v3.2.0.RC1
v3.2.0.RELEASE
v3.2.1.RELEASE
v3.2.2.RELEASE
v3.2.3.RELEASE
v3.2.4.RELEASE
v3.2.5.RELEASE
v3.2.6.RELEASE
v3.3.0.M1
v3.3.0.M2
v3.3.0.M3
v3.3.0.RC1
v3.3.0.RELEASE
v3.3.1.RELEASE
v3.3.2.RELEASE
v3.3.3.RELEASE
v3.3.4.RELEASE
v3.3.5.RELEASE
v3.4.0
v3.4.0-M1
v3.4.0-M2
v3.4.0-RC1
v3.4.0-RC2
v3.4.1
v3.4.10
v3.4.11
v3.4.12
v3.4.13
v3.4.14
v3.4.15
v3.4.2
v3.4.3
v3.4.4
v3.4.5
v3.4.6
v3.4.7
v3.4.8
v3.4.9
v3.5.0
v3.5.0-M1
v3.5.0-M2
v3.5.0-M3
v3.5.0-M4
v3.5.0-M5
v3.5.0-M6
v3.5.0-RC1
v3.5.1
v3.5.2
v3.5.3
v3.5.4
v3.5.5
v3.5.6
v3.5.7
v3.6.0
v3.6.0-M1
v3.6.0-M2
v3.6.0-M3
v3.6.0-RC1
v3.6.1
v3.6.2
v3.6.3
v3.6.4
v3.7.0
v3.7.0-M1
v3.7.0-M2
v3.7.0-M3
v3.7.0-M4
v3.7.0-M5
v3.7.0-M6
v3.7.0-RC1
v3.7.1
v3.7.10
v3.7.11
v3.7.12
v3.7.13
v3.7.14
v3.7.15
v3.7.16
v3.7.17
v3.7.18
v3.7.19
v3.7.2
v3.7.3
v3.7.4
v3.7.5
v3.7.6
v3.7.7
v3.7.8
v3.7.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47863.json"