CVEFinder.io

CVE-2026-59903

🔶 medium
Summary

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.http.cors.CorsHandler setVaryHeader replaces application Vary headers such as Authorization or Cookie with Origin, allowing a caching proxy or CDN to reuse authenticated responses across users and disclose sensitive information. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.

CVSS Score
6.5
Medium
EPSS Score
0.3
Exploit Probability
Published Date
2026-08-17
First Seen: 2026-08-18
📊 Relative Risk Intelligence

This CVE is Lower Risk - more severe than 46.6% of all 365,890 vulnerabilities in our database.

#195,497
Below average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: Aug 17, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Partial
Limited system impact
SSVC data provided by CISA
Last Modified 2026-09-23
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
CWE IDs (Weakness Types)
CWE-524

📦 Affected Products 2

Vendor Product Status Affected Versions
netty netty Affected
< 4.1.137
netty netty Affected
> 4.2.0 < 4.2.17

🔗 References 5

https://github.com/netty/netty/pull/17213
Issue Tracking Patch
https://github.com/netty/netty/pull/17217
Issue Tracking Patch
https://github.com/netty/netty/releases/tag/netty-4....
Release Notes
https://github.com/netty/netty/releases/tag/netty-4....
Release Notes
https://github.com/netty/netty/security/advisories/G...
Vendor Advisory

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-89044 🔶 medium 6.5 0.4 Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the f... 2026-09-10
CVE-2026-62380 ⚠️ high 7.5 0.3 Netty (io.netty:netty-codec-socks) versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final contain nul... 2026-08-22
CVE-2026-75595 ⛔ critical 9.1 0.5 Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Fina and 4.2.17.Final, io.netty.h... 2026-08-19
CVE-2026-75596 ⚠️ high 7.5 0.7 Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, the defau... 2026-08-19
CVE-2026-59902 ⚠️ high 7.5 0.7 Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.... 2026-08-17
CVE-2026-73507 ⚠️ high 7.5 0.8 Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.... 2026-08-13
These CVEs affect the same products