How severe is CVE-2026-47848?

CVE-2026-47848 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-47848 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-47848?

CVE-2026-47848 affects Broadcom Reactor Netty. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-47848?

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

When was CVE-2026-47848 published?

CVE-2026-47848 was published on 2026-08-26 and last updated on 2026-09-04.

CVE-2026-47848

CVE-2026-47848 is a medium-severity vulnerability in Broadcom Reactor Netty with a CVSS 3.x base score of 6.1. 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-601.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-601
Affected product: Broadcom Reactor Netty
Published: 2026-08-26
Last modified: 2026-09-04

Description

In specific scenarios involving WebSocket handshake redirects to a different origin, the Reactor Netty WebSocket client may leak credentials. In order for this to happen, the HTTP client must have been explicitly configured to follow redirects. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier

Frequently asked questions

What is CVE-2026-47848?: In specific scenarios involving WebSocket handshake redirects to a different origin, the Reactor Netty WebSocket client may leak credentials. In order for this to happen, the HTTP client must have been explicitly configured to follow redirects. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier
How severe is CVE-2026-47848?: CVE-2026-47848 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-47848 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-47848?: CVE-2026-47848 affects Broadcom Reactor Netty. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-47848?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-47848 published?: CVE-2026-47848 was published on 2026-08-26 and last updated on 2026-09-04.

References

https://spring.io/security/cve-2026-47848

Affected products (1)

cpe:2.3:a:broadcom:reactor_netty:*:*:*:*:*:*:*:*

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