How severe is CVE-2026-47857?

CVE-2026-47857 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-2026-47857 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-47857?

CVE-2026-47857 affects Broadcom Reactor Core. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-47857?

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

When was CVE-2026-47857 published?

CVE-2026-47857 was published on 2026-08-27 and last updated on 2026-09-04.

CVE-2026-47857

CVE-2026-47857 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-190.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-190
Affected product: Broadcom Reactor Core
Published: 2026-08-27
Last modified: 2026-09-04

Description

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

Frequently asked questions

What is CVE-2026-47857?: 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
How severe is CVE-2026-47857?: CVE-2026-47857 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-2026-47857 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-47857?: CVE-2026-47857 affects Broadcom Reactor Core. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-47857?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-47857 published?: CVE-2026-47857 was published on 2026-08-27 and last updated on 2026-09-04.

References

https://spring.io/security/cve-2026-47857

Affected products (1)

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

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