Answer in brief
CVE-2026-48043 records a Medium severity (CVSS 5.3) vulnerability in netty-codec-http2: ByteBuf Reference-Count Leak in DelegatingDecompressorFrameListener Leads to Memory Exhaustion. The current sources do not mark it as known exploited. The current feed maps netty/netty (generic), io.netty:netty-codec-http2 (maven), io.netty:netty-codec-http2 (maven), io.netty:netty-codec-http2 (maven) and additional mapped packages. 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 5.3. 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-http2 (maven), io.netty:netty-codec-http2 (maven), io.netty:netty-codec-http2 (maven) and additional mapped packages. 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 || < 4.1.135.Final | Not reported |
| io.netty:netty-codec-http2maven | <=4.1.134.Final | 4.1.135.Final |
| io.netty:netty-codec-http2maven | >=4.2.0.Alpha1,<=4.2.14.Final | 4.2.15.Final |
| io.netty:netty-codec-http2maven | >=0 <4.1.135.Final | 4.1.135.Final |
| io.netty:netty-codec-http2maven | >=4.2.0.Alpha1 <4.2.15.Final | 4.2.15.Final |
Published upstream
Jun 12, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 11, 2026
Netty is a network application framework for development of protocol servers and clients. In netty-codec-http2 prior to versions 4.1.135.Final and 4.2.15.Final, the `DelegatingDecompressorFrameListener` class orchestrates HTTP/2 decompression by embedding a per-stream `EmbeddedChannel` that runs the appropriate decompression codec (gzip, deflate, zstd) and forwards decompressed chunks to a wrapped listener. Each decompressed chunk is a pooled `ByteBuf` handed to an anonymous `ChannelInboundHandlerAdapter` tail handler, which becomes the sole owner responsible for releasing it. A remote peer could send frames that would result in the flow-controller throwing and so trigger a resource leak which at the end might take down the whole JVM due OOME. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
Quoted source text, attributed separately from HOL analysis.