CVE-2026-47863CWE-835

CVE-2026-47863

Medium · published August 27, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
33.6
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00405 · 33.6th percentile
Weakness
CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')
Published
2026-08-27T05:17Z
Affected products (2)
ProductVersionsFixed in
broadcom/reactor_core≥ 3.5.7, < 3.7.203.7.20
broadcom/reactor_core≥ 3.8.0, < 3.8.6.13.8.6.1
References (1)
https://spring.io/security/cve-2026-47863 · [email protected]
EPSS history
Timeline
  • 28 AUG 06:43Z
    EPSS moved — → 0%
    epss
  • 26 AUG 23:28Z
    Reactor Core bufferTimeout fair-backpressure pipeline permanently hangs when upstream delivers items during an active flush
    cvelistv5