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PatchSiren cyber security CVE debrief

CVE-2026-48748 netty CVE debrief

CVE-2026-48748 is a high-severity vulnerability in the Netty HTTP/3 codec that allows for memory exhaustion via the creation of an infinite number of blocked streams, potentially leading to an Out-of-Memory (OOM) error. This issue was patched in Netty version 4.2.15.Final.

Vendor
netty
Product
Unknown
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-07-15
Advisory published
2026-06-12
Advisory updated
2026-07-15

Who should care

Users of Netty prior to version 4.2.15.Final, especially those using the HTTP/3 codec, should be aware of this vulnerability and take steps to upgrade to the patched version.

Technical summary

The vulnerability, rated with a CVSS score of 7.5 and classified as HIGH, is caused by the improper handling of streams in the Netty HTTP/3 codec. This can lead to the creation of an infinite number of blocked streams, causing a memory exhaustion issue that can result in an OOM error.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to Netty version 4.2.15.Final or later to patch the vulnerability.

Evidence notes

The CVE was published on 2026-06-12T16:16:30.913Z and last modified on 2026-06-12T16:18:27.287Z. The vulnerability was patched in Netty version 4.2.15.Final.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-48748 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-48748

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-48748 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-48748

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.