How severe is CVE-2026-48748?

CVE-2026-48748 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-48748 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-48748?

CVE-2026-48748 affects Netty. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-48748?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-48748 have an EU (EUVD) identifier?

Yes. CVE-2026-48748 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36459.

When was CVE-2026-48748 published?

CVE-2026-48748 was published on 2026-06-12 and last updated on 2026-06-30.

CVE-2026-48748

CVE-2026-48748 is a high-severity vulnerability in Netty with a CVSS 3.x base score of 7.5. 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-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36459
Weakness: CWE-770
Affected product: Netty
Published: 2026-06-12
Last modified: 2026-06-30

Description

Netty is a network application framework for development of protocol servers and clients. Prior to version 4.2.15.Final, a memory exhaustion vulnerability in the Netty HTTP/3 codec allows the creation of an infinite number of blocked streams, which can cause OOM error. Version 4.2.15.Final patches the issue.

Frequently asked questions

What is CVE-2026-48748?: Netty is a network application framework for development of protocol servers and clients. Prior to version 4.2.15.Final, a memory exhaustion vulnerability in the Netty HTTP/3 codec allows the creation of an infinite number of blocked streams, which can cause OOM error. Version 4.2.15.Final patches the issue.
How severe is CVE-2026-48748?: CVE-2026-48748 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-48748 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-48748?: CVE-2026-48748 affects Netty. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-48748?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-48748 have an EU (EUVD) identifier?: Yes. CVE-2026-48748 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36459.
When was CVE-2026-48748 published?: CVE-2026-48748 was published on 2026-06-12 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*

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