CVE-2026-44249Disclosure(netty / netty)

LOWCVSS 8.1 · HIGH

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft
Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

Netty is a network application framework for development of protocol servers and clients. In netty-handler prior to versions 4.1.135.Final and 4.2.15.Final, an attacker can bypass IPv6 subnet rules due to an incorrect masking operation in IpSubnetFilterRule.compareTo(). Valid public IP addresses can bypass the restrictions. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

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1.5/ 10 priority

Sources & remediation

Vendor / third-party advisories

https://github.com/netty/netty/security/advisories/GHSA-3qp7-7mw8-wx86

Other references

Weakness type (CWE)

CWE-284CWE-697CWE-1287

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

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

Public PoC is present in monitored signal
1 mentions across 1 observed day

What's happening

PoC mentioned or linked in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Affected systems

Vendors

netty

Products

netty

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets1 URL

By indicator

https://zeropath.com/blog/cve-2026-44249-netty-ipv6-subnet-filter-bypass

Full discourse1 post

Hiç kimse@electrocode81d
Disclosure
Küresel yıkıcı bir saldırı yapacaksan ipv6 soketler ile yapacaksın, heleki gateway yada micro service olan sistemlerse bunlar fena gol yer.. https://zeropath.com/blog/cve-2026-44249-netty-ipv6-subnet-filter-bypass
Post summary
The post encourages attackers to target systems via IPv6 to exploit CVE-2026-44249 and links to a blog that likely details the vulnerability or PoC, but offers no evidence of active exploitation, patches, or debunking.
00095383
2.9K followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

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

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