CVE-2026-47863 Vulnerability Analysis & Exploit Details

CVE-2026-47863
Vulnerability Scoring

5.9
/10
Significant Risk

Security assessments indicate that CVE-2026-47863 presents a notable risk, potentially requiring prompt mitigation.

Attack Complexity Details

  • Attack Complexity: High
    Exploits require significant effort and special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-47863 Details

Status: Analyzed

Last updated: 🕦 01 Sep 2026, 23:51 UTC
Originally published on: 🕐 27 Aug 2026, 01:17 UTC

Time between publication and last update: 5 days

CVSS Release: version 3

CVSS3 Source

security@vmware.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVE-2026-47863 Vulnerability Summary

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

Assessing the Risk of CVE-2026-47863

Access Complexity Graph

The exploitability of CVE-2026-47863 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-47863

CVE-2026-47863 presents a challenge to exploit due to its high attack complexity, but the absence of privilege requirements still makes it a viable target for skilled attackers. A thorough security review is advised.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-47863, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-47863, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2026-47863 has no significant impact on data confidentiality.
  • Integrity: None
    CVE-2026-47863 poses no threat to data integrity.
  • Availability: High
    CVE-2026-47863 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2026-47863 References

External References

CWE Common Weakness Enumeration

CWE-835

Vulnerable Configurations

  • cpe:2.3:a:broadcom:reactor_core:3.5.7:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.5.7:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.5.8:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.5.8:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.5.9:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.5.9:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.5.10:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.5.10:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.5.11:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.5.11:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.5.12:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.5.12:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.5.13:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.5.13:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.5.14:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.5.14:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.5.15:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.5.15:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.5.16:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.5.16:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.5.17:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.5.17:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.5.18:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.5.18:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.5.19:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.5.19:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.5.20:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.5.20:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.0:-:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.0:-:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.0:milestone1:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.0:milestone1:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.0:milestone2:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.0:milestone2:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.0:milestone3:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.0:milestone3:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.2:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.2:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.3:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.3:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.4:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.4:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.5:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.5:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.6:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.6:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.7:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.7:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.8:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.8:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.9:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.9:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.10:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.10:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.11:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.11:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.12:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.12:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.13:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.13:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.14:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.14:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.15:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.15:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.16:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.16:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.17:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.17:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.6.18:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.6.18:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.0:-:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.0:-:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.0:milestone1:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.0:milestone1:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.0:milestone2:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.0:milestone2:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.0:milestone3:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.0:milestone3:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.0:milestone4:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.0:milestone4:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.0:milestone5:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.0:milestone5:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.0:milestone6:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.0:milestone6:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.1:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.2:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.2:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.3:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.3:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.4:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.4:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.5:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.5:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.6:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.6:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.7:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.7:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.8:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.8:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.9:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.9:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.10:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.10:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.11:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.11:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.12:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.12:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.13:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.13:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.14:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.14:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.15:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.15:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.16:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.16:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.17:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.17:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.18:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.18:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.7.19:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.7.19:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.8.0:-:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.8.0:-:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.8.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.8.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.8.0:milestone1:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.8.0:milestone1:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.8.0:milestone2:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.8.0:milestone2:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.8.0:milestone3:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.8.0:milestone3:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.8.0:milestone4:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.8.0:milestone4:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.8.0:milestone5:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.8.0:milestone5:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.8.0:milestone6:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.8.0:milestone6:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.8.0:milestone7:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.8.0:milestone7:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.8.1:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.8.2:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.8.2:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.8.3:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.8.3:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.8.4:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.8.4:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.8.5:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.8.5:*:*:*:*:*:*:*
  • cpe:2.3:a:broadcom:reactor_core:3.8.6:*:*:*:*:*:*:*
    cpe:2.3:a:broadcom:reactor_core:3.8.6:*:*:*:*:*:*:*

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