CVE-2026-42587Patch(netty / netty)

LOWCVSS 7.5 · HIGH

Signal is active with 3 mentions in latest observed window

Immediate actions

Patch netty netty systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpContentDecompressor accepts a maxAllocation parameter to limit decompression buffer size and prevent decompression bomb attacks. This limit is correctly enforced for gzip and deflate encodings via ZlibDecoder, but is silently ignored when the content encoding is br (Brotli), zstd, or snappy. An attacker can bypass the configured decompression limit by sending a compressed payload with Content-Encoding: br instead of Content-Encoding: gzip, causing unbounded memory allocation and out-of-memory denial of service. The same vulnerability exists in DelegatingDecompressorFrameListener for HTTP/2 connections. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

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0.5/ 10 priority

Sources & remediation

Exploit / PoC references

Other references

Weakness type (CWE)

CWE-400CWE-770

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

netty

Threat summary

Patch or workaround signal is available
3 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 3 signals
Technical details provided in 3 signals
3 total mentions across 1 day

Affected systems

Vendors

netty

Products

netty

Deep dive

Activity timeline3 mentions / 1d

Signal classification1 categories

Patch

3100.0%

Referenced assets5 URLs

By indicator

Full discourse3 posts

Infoflowcloud@infoflowcloud147d
Patch
🚨*CVE* CVE-2026-42587 Netty is an asynchronous, event-driven network application framework. Prior to http://4.2.13.Final and http://4.1.133.Final, HttpContentDecompressor accepts a maxAllocation paramet… https://www.cve.org/CVERecord?id=CVE-2026-42587 ----- Traducció… http://infoflow.cloud`
Post summary
The tweet informs about CVE-2026-42587 affecting Netty’s HttpContentDecompressor and indicates that versions 4.2.13.Final and 4.1.133.Final patch the vulnerability, but it offers no PoC, exploit code, or evidence of active exploitation.
0000029
77 followersView on X
CVE@CVEnew147d
Patch
CVE-2026-42587 Netty is an asynchronous, event-driven network application framework. Prior to http://4.2.13.Final and http://4.1.133.Final, HttpContentDecompressor accepts a maxAllocation paramet… https://www.cve.org/CVERecord?id=CVE-2026-42587
Post summary
The post outlines CVE‑2026‑42587, a flaw in Netty’s HttpContentDecompressor via the maxAllocation parameter, which is mitigated by upgrading to Netty 4.2.13.Final or 4.1.133.Final. No active exploitation or proof‑of‑concept is mentioned.
00000319
57.5K followersView on X
Vulmon Vulnerability Feed@VulmonFeeds147d
Patch
CVE-2026-42587 Decompression Bomb Bypass in Netty HttpContentDecompressor Prior to http://4.2.13.Final https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-42587
Post summary
A decompression bomb bypass vulnerability (CVE‑2026‑42587) affects Netty HttpContentDecompressor before version 4.2.13.Final; upgrading to 4.2.13.Final provides a patch.
0000052
4.0K followersView on X

CPE platform detail1 entries

Part:

Vendor:

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Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	netty	netty	-	-	-

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