Answer in brief
CVE-2026-48748 records a High severity (CVSS 7.5) vulnerability in Netty HTTP/3 QPACK Blocked Streams Memory Exhaustion. The current sources do not mark it as known exploited. The current feed maps netty/netty (generic), io.netty:netty-codec-http3 (maven), io.netty:netty-codec-http3 (maven), io.netty:netty-codec-http3 (maven). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps netty/netty (generic), io.netty:netty-codec-http3 (maven), io.netty:netty-codec-http3 (maven), io.netty:netty-codec-http3 (maven). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| netty/nettygeneric | >= 4.2.0.Final, < 4.2.15.Final | Not reported |
| io.netty:netty-codec-http3maven | >=4.2.0.Final,<=4.2.14.Final | 4.2.15.Final |
| io.netty:netty-codec-http3maven | >=4.2.0.Final,<=4.2.13.Final | 4.2.15.Final |
| io.netty:netty-codec-http3maven | >=4.2.0.Final <4.2.15.Final | 4.2.15.Final |
Published upstream
Jun 12, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
Netty is a network application framework for development of protocol servers and clients. Starting in version 4.2.0.Final and 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.
Quoted source text, attributed separately from HOL analysis.