CVE-2026-42586
📛 CVE Title
Netty: CRLF Injection in Netty Redis Codec Encoder
Description
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, the Netty Redis codec encoder (RedisEncoder) writes user-controlled string content directly to the network output buffer without validating or sanitizing CRLF (\r\n) characters. Since the Redis Serialization Protocol (RESP) uses CRLF as the command/response delimiter, an attacker who can control the content of a Redis message can inject arbitrary Redis commands or forge fake responses. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- GitHub_M
- CVSS severity
- MEDIUM
- CVSS score
- 6.8 / 10
- CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N- Effective score
- 6.8 / 10 MEDIUM source: CNA overview
- CWE(s)
-
CWE-93 - Reserved
- 2026-04-28
- Published
- 2026-05-13 20:20 UTC
- Last updated
- 2026-05-14 20:17 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/42xxx/CVE-2026-42586.json
- Linked Threat
- CVE-2026-42586 — CVE-2026-42586
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-05-13 19:17:24 UTC
- NVD last modified
- 2026-05-18 18:02:43 UTC
- NVD CVSS v3.1
- 6.8 / 10 MEDIUM source: security-advisories@github.com
- NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N- Exploitability subscore
- 2.5 / 10
- Impact subscore
- 4.2 / 10
- EPSS score
- 0.0001 (probability of exploitation in next 30 days)
- EPSS percentile
- 0.71% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24
NVD / KEV / EPSS data refreshed 2026-05-25 09:21 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-30129 - Assigner
- GitHub_M
- Published
- May 13, 2026, 6:20:46 PM
- Updated
- May 14, 2026, 6:17:23 PM
- EUVD base score (CVSS 3.1)
-
6.8 / 10
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N - EUVD-reported EPSS
- 0.0100
- Vendors
- io.netty, netty
- Products
-
netty-codec-redis (4.2.0.Alpha1, < 4.2.13.Final)netty (4.2.0.Alpha1, < 4.2.13.Final)netty-codec-redis (< 4.1.133.Final)netty (< 4.1.133.Final)
- Aliases
-
GHSA-rgrr-p7gp-5xj7
ENISA description: Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, the Netty Redis codec encoder (RedisEncoder) writes user-controlled string content directly to the network output buffer without validating or sanitizing CRLF (\r\n) characters. Since the Redis Serialization Protocol (RESP) uses CRLF as the command/response delimiter, an attacker who can control the content of a Redis message can inject arbitrary Redis commands or forge fake responses. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
EUVD references (1)
Affected products (2)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| netty | netty |
>= 4.2.0.Alpha1, < 4.2.13.Final (affected),
< 4.1.133.Final (affected)
|
— |
| io.netty | netty-codec-redis |
>= 4.2.0.Alpha1, < 4.2.13.Final (affected),
< 4.1.133.Final (affected)
|
— |
Affected products — CPE 2.3 (1) NVD
NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
Vendor references (1)
References embedded in the original CVE record by the assigning CNA.
- https://github.com/netty/netty/security/advisories/GHSA-rgrr-p7gp-5xj7 x_refsource_CONFIRM
MITRE references (1) cveawg.mitre.org
Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.
- https://github.com/netty/netty/security/advisories/GHSA-rgrr-p7gp-5xj7 x_refsource_CONFIRM
Web references (3)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://nvd.nist.gov/vuln/detail/CVE-2026-42586 tenable:nvd.nist.gov
- https://www.cve.org/CVERecord?id=CVE-2026-42586 tenable:www.cve.org
- https://www.first.org/epss/ tenable:www.first.org
NVD-tagged references (2)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://github.com/netty/netty/security/advisories/GHSA-rgrr-p7gp-5xj7 security-advisories@github.com ExploitMitigationVendor Advisory
- https://github.com/netty/netty/security/advisories/GHSA-rgrr-p7gp-5xj7 134c704f-9b21-4f2e-91b3-4a467353bcc0 ExploitMitigationVendor Advisory
Remediations (20)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:app.opencve.io
Remediation No vendor fix or workaround currently provided. OpenCVE Recommended Actions Upgrade the Netty library to version 4.2.13.Final or 4.1.133.Final or newer. Validate or sanitize output from RedisEncoder, ensuring that user supplied data does not contain CRLF characters before encoding.
2026-05-23 20:54 UTC -
web:blogs.oracle.com
For more information about the Critical Patch Update program, see the security vulnerability remediation practices page located on the Oracle Trust Center.
2026-05-23 20:54 UTC -
web:blogs.oracle.com
As a follow-up to our recent post, Accelerating Vulnerability Detection and Response, Oracle is announcing the start date and cadence for monthly Critical Security Patch Updates (CSPUs). Beginning May 28, 2026 , Oracle will deliver a Critical Security Patch Update (CSPU) each month. CSPUs provide targeted fixes for critical vulnerabilities in a smaller, more focused format, allowing customers ...
2026-05-23 20:54 UTC -
web:docs.oracle.com
Oracle Critical Patch Update (CPU) April 2026 for Oracle Java SE Services: Java Management Release Date: April 21, 2026
2026-05-23 20:54 UTC -
web:krebsonsecurity.com
Microsoft expects that exploitation is more likely. May's Patch Tuesday is a welcome respite from April, which saw Microsoft fix a near-record 167 security flaws.
2026-05-23 20:54 UTC -
web:oradba.ch
19c 26ai cve oracle-cpu patch -management release-update security Oracle CPU April 2026 : Delayed RUs & First Analysis On April 21, 2026 , Oracle released the Critical Patch Update (CPU) for April 2026 — 481 new security fixes across the entire Oracle product stack. For Oracle Database, this means another round of mandatory patching.
2026-05-23 20:54 UTC -
web:www.crowdstrike.com
Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.
2026-05-23 20:54 UTC -
web:www.oracle.com
This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.
2026-05-23 20:54 UTC -
web:www.securityweek.com
Oracle on Tuesday announced the release of 481 new security patches as part of its April 2026 Critical Patch Update (CPU). Across the 28 product families that received security updates, more than 300 patches address vulnerabilities that are remotely exploitable without authentication.
2026-05-23 20:54 UTC -
web:www.tenable.com
Oracle addresses 241 CVEs in its April Critical Patch Update, the second quarterly update of 2026 with 481 patches, including 34 critical updates.
2026-05-23 20:54 UTC -
web:community.ui.com
Published: May 21, 2026 Updated: May 22, 2026 Version: 1.1 Revision: 1.1 Summary 1 of 5 A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection. Affected Products: UniFi OS Server (Version 5.0.6 and earlier) Mitigation : Update your UniFi OS Server to Version 5.0.8 or later ...
2026-05-26 02:53 UTC -
web:en-forum.guildwars2.com
03/31/2026—March 31 Release Notes Note to users of third-party programs: The game may not launch or work properly after we release a new build if you use a third-party program, due to possible incompatibilities. ArenaNet cannot offer support if a third-party modification breaks, interferes with, ...
2026-05-26 02:53 UTC -
web:hi.service-now.com
The Now Support portal is your launchpad to access self-help, get technical support, and manage your ServiceNow instances. Log in to manage upgrades, follow changes, view knowledge content, and more. Formerly HI portal.
2026-05-26 02:53 UTC -
web:msrc.microsoft.com
Security Update Guide - Microsoft Security Response Center
2026-05-26 02:53 UTC -
web:onlyfans.com
OnlyFans is the social platform revolutionizing creator and fan connections. The site is inclusive of artists and content creators from all genres and allows them to monetize their content while developing authentic relationships with their fanbase.
2026-05-26 02:53 UTC -
web:wa.me
Hosted by WhatsApp 2026 © WhatsApp LLC Privacy & Terms
2026-05-26 02:53 UTC -
web:www.grammarly.com
Grammarly makes AI writing convenient. Work smarter with personalized AI guidance and text generation on any app or website.
2026-05-26 02:53 UTC -
web:www.nexusmods.com
U+ for Star Wars Jedi: Survivor is a graphics enhancement and performance improvement mod that provides advanced control over lighting, reflections, and visual effects.
2026-05-26 02:53 UTC -
web:www.virustotal.com
VirusTotal is a platform for scanning files and URLs for viruses, malware, and other threats using multiple antivirus engines.
2026-05-26 02:53 UTC -
web:www.youtube.com
Catch A Monster Roblox Patch 0.32 is live, and this update adds a lot: Draco Spike Evo, the new Mutation Extractor, Jokaire from the Mobius Circus slot machi...
2026-05-26 02:53 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-42586.json.
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