How severe is CVE-2026-47863?

CVE-2026-47863 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-47863 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-47863?

CVE-2026-47863 affects Broadcom Reactor Core. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-47863?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-47863 published?

CVE-2026-47863 was published on 2026-08-27 and last updated on 2026-09-01.

CVE-2026-47863

CVE-2026-47863 is a medium-severity vulnerability in Broadcom Reactor Core with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-835.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-835
Affected product: Broadcom Reactor Core
Published: 2026-08-27
Last modified: 2026-09-01

Description

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

Frequently asked questions

What is CVE-2026-47863?: 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
How severe is CVE-2026-47863?: CVE-2026-47863 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-47863 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-47863?: CVE-2026-47863 affects Broadcom Reactor Core. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-47863?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-47863 published?: CVE-2026-47863 was published on 2026-08-27 and last updated on 2026-09-01.

References

https://spring.io/security/cve-2026-47863

Affected products (1)

cpe:2.3:a:broadcom:reactor_core:*:*:*:*:*:*:*:*

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