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☕ Maven
Not in CISA KEV
HIGH severity

CVE-2015-2156 — netty-parent

HIGHFix: netty/netty#3754

CVE-2015-2156 is a high-severity (CVSS 7.5) Improper Input Validation vulnerability in io.netty:netty-parent. A fix is available for io.netty:netty-parent — see the affected versions and patch details below.

Information Exposure in Netty

Also known asGHSA-xfv3-rrfm-f2rv
Published
Updated
Affected
5 pkgs
Patched
5 / 5
Exploits
None indexed
Exploitation data as of Oct 23, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
5.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs92th percentile — riskier than 92% of all scored CVEsHighest risk
2.62%3.78%4.93%6.08%3.3%5.2%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

5 pkgs affected
☕io.netty:netty-parent☕org.jboss.netty:netty☕org.jboss.netty:netty☕io.netty:netty☕io.netty:netty

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Netty before 3.9.8.Final, 3.10.x before 3.10.3.Final, 4.0.x before 4.0.28.Final, and 4.1.x before 4.1.0.Beta5 and Play Framework 2.x before 2.3.9 might allow remote attackers to bypass the httpOnly flag on cookies and obtain sensitive information by leveraging improper validation of cookie name and value characters.

Affected Packages

5 total 5 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenio.netty:netty-parent≥ 4.0.0&&< 4.0.28.Final4.0.28.Finalio.netty:netty-parent:4.0.28.Final
☕Mavenorg.jboss.netty:nettyall versions3.9.8.Finalorg.jboss.netty:netty:3.9.8.Final
☕Mavenorg.jboss.netty:netty≥ 3.10.0&&< 3.10.3.Final3.10.3.Finalorg.jboss.netty:netty:3.10.3.Final
☕Mavenio.netty:netty≥ 3.10.0&&< 3.10.3.Final3.10.3.Finalio.netty:netty:3.10.3.Final
☕Mavenio.netty:nettyall versions3.9.8.Finalio.netty:netty:3.9.8.Final

Affected Products

3 products · 110 configurations
Application
play frameworklightbend
23 versions
2.02.0.22.0.32.0.42.0.52.0.62.0.72.0.82.1.02.1.12.2.02.2.1
Application
nettynetty
≤ 3.9.7
32 versions
3.10.03.10.13.10.24.0.04.0.14.0.24.0.34.0.44.0.54.0.64.0.74.0.8
Application
play frameworkplayframework
15 versions
2.02.0.12.1.12.1.22.1.32.1.42.1.52.1.62.2.02.2.12.2.22.2.3

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for io.netty:netty-parent, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update io.netty:netty-parent to 4.0.28.Final or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2015-2156 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Netty before 3.9.8.Final, 3.10.x before 3.10.3.Final, 4.0.x before 4.0.28.Final, and 4.1.x before 4.1.0.Beta5 and Play Framework 2.x before 2.3.9 might allow remote attackers to bypass the httpOnly flag on cookies and obtain sensitive information by leveraging improper validation of cookie name and value characters.
O3 Security · Impact-Aware SCA

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CVE-2015-2156: netty-parent — Fixed in 4.0.28.Final