Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
netty-codec-http2: ByteBuf Reference-Count Leak in DelegatingDecompressorFrameListener Leads to Memory Exhaustion
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N U N N H 7.5 .0062 46.9 —
AFFECTED
Product Versions Fixed
netty >= 4.2.0.Final, < 4.2.15.Final – —
TIMELINE
May 20 Reserved by GitHub_M
Jun 12 Published (CNA: GitHub_M)
Aug 13 RESCORED — CVE-2026-48043 (netty). CVSS 5.3 → 7.5 (NVD).
Description
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| May 20, 2026 | Reserved | Reserved by GitHub_M |
| June 12, 2026 | Published | Published (CNA: GitHub_M) |
| August 13, 2026 | RESCORED | RESCORED — CVE-2026-48043 (netty). CVSS 5.3 → 7.5 (NVD). |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| netty | netty | — | >= 4.2.0.Final, < 4.2.15.Final | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-48043 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.