What is CVE-2026-47863?

CVE-2026-47863 is a medium-severity vulnerability in Broadcom Reactor Core, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.9/10. Published 2026-08-27.

How severe is CVE-2026-47863?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Broadcom Reactor Core

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

Published 2026-08-27 · last modified 2026-09-01.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (32.7th percentile), scored 2026-10-11.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002

Affected products

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

spring.io/security/cve-2026-47863 (Vendor Advisory)

Frequently asked questions

What is CVE-2026-47863?: CVE-2026-47863 is a medium-severity vulnerability in Broadcom Reactor Core, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.9/10. Published 2026-08-27.
How severe is CVE-2026-47863?: Medium severity. CVSS v3 base score is 5.9 out of 10.