GHSA-2qj4-mmr9-4v2f

Suggest an improvement
Source
https://github.com/advisories/GHSA-2qj4-mmr9-4v2f
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-2qj4-mmr9-4v2f/GHSA-2qj4-mmr9-4v2f.json
JSON Data
https://api.test.osv.dev/v1/vulns/GHSA-2qj4-mmr9-4v2f
Aliases
Downstream
Published
2026-08-17T17:50:49Z
Modified
2026-08-17T18:11:15Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Netty: Memory Exhaustion in SctpMessageCompletionHandler
Details

Summary

SctpMessageCompletionHandler does not limit the total size of buffered fragments, allowing an unauthenticated attacker to cause an OutOfMemoryError by sending large SCTP fragments.

Details

io.netty.handler.codec.sctp.SctpMessageCompletionHandler buffers fragments for incomplete SCTP messages. The fix for CVE-2026-46340 fixed unbounded memory growth by introducing limits on the number of concurrent incomplete messages (maxIncompleteSctpMessages) and the number of fragments per message (maxFragments).

While the count of fragments is now bounded, the handler still does not enforce a maximum size in bytes.

With the default limits of 128 messages and 128 fragments, and a typical max SCTP chunk size of 64KB, an attacker can consume up to ~1GB per connection. By opening a small number of concurrent connections, an attacker can easily exhaust the server's memory, causing an OutOfMemoryError.

Impact

Memory Exhaustion. Any application using Netty's SCTP transport with SctpMessageCompletionHandler is impacted.

Database specific 
{
    "cwe_ids":  [
        "CWE-400"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-08-17T17:50:49Z",
    "nvd_published_at":  null,
    "severity":  "HIGH"
}
References

Affected packages

Maven / io.netty:netty-transport-sctp

Package

Name
io.netty:netty-transport-sctp
View open source insights on deps.dev
Purl
pkg:maven/io.netty/netty-transport-sctp

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.2.0.Final
Fixed
4.2.17.Final

Affected versions

4.*
4.2.0.Final
4.2.1.Final
4.2.2.Final
4.2.3.Final
4.2.4.Final
4.2.5.Final
4.2.6.Final
4.2.7.Final
4.2.8.Final
4.2.9.Final
4.2.10.Final
4.2.11.Final
4.2.12.Final
4.2.13.Final
4.2.14.Final
4.2.15.Final
4.2.16.Final

Database specific

last_known_affected_version_range 
"<= 4.2.16.Final"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-2qj4-mmr9-4v2f/GHSA-2qj4-mmr9-4v2f.json"

Maven / io.netty:netty-transport-sctp

Package

Name
io.netty:netty-transport-sctp
View open source insights on deps.dev
Purl
pkg:maven/io.netty/netty-transport-sctp

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.1.137.Final

Affected versions

4.*
4.0.0.Beta1
4.0.0.Beta2
4.0.0.Beta3
4.0.0.CR1
4.0.0.CR2
4.0.0.CR3
4.0.0.CR4
4.0.0.CR5
4.0.0.CR6
4.0.0.CR7
4.0.0.CR8
4.0.0.CR9
4.0.0.Final
4.0.1.Final
4.0.2.Final
4.0.3.Final
4.0.4.Final
4.0.5.Final
4.0.6.Final
4.0.7.Final
4.0.8.Final
4.0.9.Final
4.0.10.Final
4.0.11.Final
4.0.12.Final
4.0.13.Final
4.0.14.Beta1
4.0.14.Final
4.0.15.Final
4.0.16.Final
4.0.17.Final
4.0.18.Final
4.0.19.Final
4.0.20.Final
4.0.21.Final
4.0.22.Final
4.0.23.Final
4.0.24.Final
4.0.25.Final
4.0.26.Final
4.0.27.Final
4.0.28.Final
4.0.29.Final
4.0.30.Final
4.0.31.Final
4.0.32.Final
4.0.33.Final
4.0.34.Final
4.0.35.Final
4.0.36.Final
4.0.37.Final
4.0.38.Final
4.0.39.Final
4.0.40.Final
4.0.41.Final
4.0.42.Final
4.0.43.Final
4.0.44.Final
4.0.45.Final
4.0.46.Final
4.0.47.Final
4.0.48.Final
4.0.49.Final
4.0.50.Final
4.0.51.Final
4.0.52.Final
4.0.53.Final
4.0.54.Final
4.0.55.Final
4.0.56.Final
4.1.0.Beta1
4.1.0.Beta2
4.1.0.Beta3
4.1.0.Beta4
4.1.0.Beta5
4.1.0.Beta6
4.1.0.Beta7
4.1.0.Beta8
4.1.0.CR1
4.1.0.CR2
4.1.0.CR3
4.1.0.CR4
4.1.0.CR5
4.1.0.CR6
4.1.0.CR7
4.1.0.Final
4.1.1.Final
4.1.2.Final
4.1.3.Final
4.1.4.Final
4.1.5.Final
4.1.6.Final
4.1.7.Final
4.1.8.Final
4.1.9.Final
4.1.10.Final
4.1.11.Final
4.1.12.Final
4.1.13.Final
4.1.14.Final
4.1.15.Final
4.1.16.Final
4.1.17.Final
4.1.18.Final
4.1.19.Final
4.1.20.Final
4.1.21.Final
4.1.22.Final
4.1.23.Final
4.1.24.Final
4.1.25.Final
4.1.26.Final
4.1.27.Final
4.1.28.Final
4.1.29.Final
4.1.30.Final
4.1.31.Final
4.1.32.Final
4.1.33.Final
4.1.34.Final
4.1.35.Final
4.1.36.Final
4.1.37.Final
4.1.38.Final
4.1.39.Final
4.1.40.Final
4.1.41.Final
4.1.42.Final
4.1.43.Final
4.1.44.Final
4.1.45.Final
4.1.46.Final
4.1.47.Final
4.1.48.Final
4.1.49.Final
4.1.50.Final
4.1.51.Final
4.1.52.Final
4.1.53.Final
4.1.54.Final
4.1.55.Final
4.1.56.Final
4.1.57.Final
4.1.58.Final
4.1.59.Final
4.1.60.Final
4.1.61.Final
4.1.62.Final
4.1.63.Final
4.1.64.Final
4.1.65.Final
4.1.66.Final
4.1.67.Final
4.1.68.Final
4.1.69.Final
4.1.70.Final
4.1.71.Final
4.1.72.Final
4.1.73.Final
4.1.74.Final
4.1.75.Final
4.1.76.Final
4.1.77.Final
4.1.78.Final
4.1.79.Final
4.1.80.Final
4.1.81.Final
4.1.82.Final
4.1.83.Final
4.1.84.Final
4.1.85.Final
4.1.86.Final
4.1.87.Final
4.1.88.Final
4.1.89.Final
4.1.90.Final
4.1.91.Final
4.1.92.Final
4.1.93.Final
4.1.94.Final
4.1.95.Final
4.1.96.Final
4.1.97.Final
4.1.98.Final
4.1.99.Final
4.1.100.Final
4.1.101.Final
4.1.102.Final
4.1.103.Final
4.1.104.Final
4.1.105.Final
4.1.106.Final
4.1.107.Final
4.1.108.Final
4.1.109.Final
4.1.110.Final
4.1.111.Final
4.1.112.Final
4.1.113.Final
4.1.114.Final
4.1.115.Final
4.1.116.Final
4.1.117.Final
4.1.118.Final
4.1.119.Final
4.1.120.Final
4.1.121.Final
4.1.122.Final
4.1.123.Final
4.1.124.Final
4.1.125.Final
4.1.126.Final
4.1.127.Final
4.1.128.Final
4.1.129.Final
4.1.130.Final
4.1.131.Final
4.1.132.Final
4.1.133.Final
4.1.134.Final
4.1.135.Final
4.1.136.Final

Database specific

last_known_affected_version_range 
"<= 4.1.136.Final"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-2qj4-mmr9-4v2f/GHSA-2qj4-mmr9-4v2f.json"