CVE-2026-42586

MEDIUMNVD 6.86.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.8 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 90% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.8Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
6.8
EG Score
6.8(medium)
EG Risk
31(Track)
EG Risk 31/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity68% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

May 13, 2026

Last Modified

May 18, 2026

Advisory Details (1)

Auto-updated May 18, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

CRLF Injection in Netty Redis Codec Encoder · Advisory · netty/netty · GitHub

https://github.com/netty/netty/security/advisories/GHSA-rgrr-p7gp-5xj7

Vendor Advisories for CVE-2026-42586(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibnetty-java (1:4.0.34-1ubuntu0.1~esm4) @ xenial2026-08-23ubuntu
redhatnetty-codec-redis2026-07-20redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
netty1:4.1.48-10 ... 1:4.1.48-9 (16 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
netty1:4.1.48-10 ... 1:4.1.48-9 (12 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
netty1:4.1.48-10 ... 1:4.1.48-16 (8 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
netty1:4.1.48-10 ... 1:4.1.48-16 (7 versions)——
Maven(1)
PackageVulnerable rangeFixed inDependents
io.netty:netty-codec-redis4.1.0.Final ... 4.1.99.Final (133 versions)4.1.133.Final—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 5× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 171 total refreshes for this CVE.

  1. 2026-09-06 13:47 UTCEPSS rescore
  2. 2026-09-04 05:06 UTCEPSS rescore
  3. 2026-09-02 14:12 UTCEPSS rescore
  4. 2026-09-01 13:54 UTCEPSS rescore
  5. 2026-08-30 19:17 UTCEPSS rescore
  6. 2026-08-30 01:22 UTCEPSS rescore
  7. 2026-08-28 21:41 UTCEPSS rescore
  8. 2026-08-27 14:25 UTCEPSS rescore
  9. 2026-08-26 14:46 UTCEPSS rescore
  10. 2026-08-23 17:50 UTCEG score recompute
  11. 2026-08-23 17:50 UTCVendor advisory
  12. 2026-08-23 00:19 UTCEPSS rescore
  13. 2026-08-22 02:05 UTCEG score recompute
  14. 2026-08-22 02:05 UTCVendor advisory
  15. 2026-08-21 23:49 UTCEPSS rescore
  16. 2026-08-20 22:55 UTCEPSS rescore
  17. 2026-08-20 19:47 UTCEG score recompute
  18. 2026-08-20 19:47 UTCVendor advisory
  19. 2026-08-19 17:03 UTCEPSS rescore
  20. 2026-08-18 13:48 UTCEPSS rescore
  21. 2026-08-17 13:47 UTCEPSS rescore
  22. 2026-08-17 10:30 UTCEG score recompute
  23. 2026-08-17 10:30 UTCVendor advisory
  24. 2026-08-16 14:56 UTCEPSS rescore
  25. 2026-08-16 04:02 UTCEG score recompute
Show 75 more
  1. 2026-08-16 04:02 UTCVendor advisory
  2. 2026-08-16 02:14 UTCEPSS rescore
  3. 2026-08-15 01:56 UTCEG score recompute
  4. 2026-08-15 01:56 UTCVendor advisory
  5. 2026-08-15 01:30 UTCEPSS rescore
  6. 2026-08-14 02:30 UTCEG score recompute
  7. 2026-08-14 02:30 UTCVendor advisory
  8. 2026-08-13 22:00 UTCEPSS rescore
  9. 2026-08-12 23:54 UTCEG score recompute
  10. 2026-08-12 23:54 UTCVendor advisory
  11. 2026-08-12 13:51 UTCEPSS rescore
  12. 2026-08-12 00:28 UTCEG score recompute
  13. 2026-08-12 00:28 UTCVendor advisory
  14. 2026-08-11 13:43 UTCEPSS rescore
  15. 2026-08-11 00:56 UTCEG score recompute
  16. 2026-08-11 00:56 UTCVendor advisory
  17. 2026-08-11 00:00 UTCEPSS rescore
  18. 2026-08-10 01:20 UTCEG score recompute
  19. 2026-08-10 01:20 UTCVendor advisory
  20. 2026-08-09 13:46 UTCEPSS rescore
  21. 2026-08-09 01:54 UTCEG score recompute
  22. 2026-08-09 01:54 UTCVendor advisory
  23. 2026-08-08 16:37 UTCEPSS rescore
  24. 2026-08-07 20:32 UTCEG score recompute
  25. 2026-08-07 20:32 UTCVendor advisory
  26. 2026-08-06 21:06 UTCEG score recompute
  27. 2026-08-06 21:06 UTCVendor advisory
  28. 2026-08-06 13:46 UTCEPSS rescore
  29. 2026-08-05 21:40 UTCEG score recompute
  30. 2026-08-05 21:40 UTCVendor advisory
  31. 2026-08-05 19:17 UTCEPSS rescore
  32. 2026-08-04 15:10 UTCEPSS rescore
  33. 2026-08-04 10:38 UTCEPSS rescore
  34. 2026-08-03 19:08 UTCEG score recompute
  35. 2026-08-03 19:08 UTCVendor advisory
  36. 2026-08-03 10:36 UTCEPSS rescore
  37. 2026-08-02 19:10 UTCEG score recompute
  38. 2026-08-02 19:10 UTCVendor advisory
  39. 2026-08-02 02:27 UTCEPSS rescore
  40. 2026-08-01 19:44 UTCEG score recompute
  41. 2026-08-01 19:44 UTCVendor advisory
  42. 2026-08-01 04:16 UTCEPSS rescore
  43. 2026-07-30 16:28 UTCEPSS rescore
  44. 2026-07-30 01:30 UTCEPSS rescore
  45. 2026-07-28 15:36 UTCEPSS rescore
  46. 2026-07-27 14:13 UTCEPSS rescore
  47. 2026-07-26 14:54 UTCEPSS rescore
  48. 2026-07-26 14:54 UTCEPSS rescore
  49. 2026-07-25 14:18 UTCEPSS rescore
  50. 2026-07-24 14:17 UTCEPSS rescore
  51. 2026-07-23 14:18 UTCEPSS rescore
  52. 2026-07-23 03:11 UTCEG score recompute
  53. 2026-07-22 14:08 UTCEPSS rescore
  54. 2026-07-21 15:24 UTCEPSS rescore
  55. 2026-07-20 17:08 UTCEPSS rescore
  56. 2026-07-19 14:31 UTCEPSS rescore
  57. 2026-07-19 02:29 UTCEPSS rescore
  58. 2026-07-18 10:04 UTCEPSS rescore
  59. 2026-07-18 02:29 UTCOSV refresh
  60. 2026-07-16 17:03 UTCEPSS rescore
  61. 2026-07-15 16:57 UTCEPSS rescore
  62. 2026-07-15 02:00 UTCEPSS rescore
  63. 2026-07-13 22:30 UTCEPSS rescore
  64. 2026-07-13 06:13 UTCEPSS rescore
  65. 2026-07-12 05:46 UTCEPSS rescore
  66. 2026-07-11 08:27 UTCEPSS rescore
  67. 2026-07-09 19:10 UTCEPSS rescore
  68. 2026-07-08 15:15 UTCEPSS rescore
  69. 2026-07-07 13:46 UTCEPSS rescore
  70. 2026-07-06 16:27 UTCEPSS rescore
  71. 2026-07-06 16:27 UTCEPSS rescore
  72. 2026-07-06 02:23 UTCEPSS rescore
  73. 2026-07-06 02:23 UTCEPSS rescore
  74. 2026-07-05 02:30 UTCEPSS rescore
  75. 2026-07-04 06:31 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-42586?
CVE-2026-42586 is a medium vulnerability published on May 13, 2026. 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…
When was CVE-2026-42586 disclosed?
CVE-2026-42586 was first published in the National Vulnerability Database on May 13, 2026, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42586 actively exploited?
CVE-2026-42586 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 90.3% of all scored CVEs.
What is the CVSS score of CVE-2026-42586?
CVE-2026-42586 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2026-42586?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42586, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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