CVE-2026-59901

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 82% 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
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, the Bzip2Decoder handler in Netty's compression codec pipeline is vulnerable to a denial-of-service attack through a malformed bzip2 stream that permanently captures the event-loop thread in an infinite loop. The vulnerability exists in the run-length encoding (RLE) state machine within [Bzip2BlockDecompressor.read()]. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

July 22, 2026

Last Modified

August 6, 2026

Advisory Details (1)

Auto-updated Jul 29, 2026
Patch available. Sources: github.
github Patch Available

[Bzip2Decoder] Infinite Loop in RLE State Machine Leads to Event-Loop Thread Hang · Advisory · netty/netty · GitHub

https://github.com/netty/netty/security/advisories/GHSA-558v-64gr-wgg4

Vendor Advisories for CVE-2026-59901(2)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatnetty-codec-compression2026-08-12redhat

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

(6 across 5 ecosystems)
Maven(2)
PackageVulnerable rangeFixed inDependents
io.netty:netty-codec4.0.0.Alpha1 ... 4.1.99.Final (229 versions)4.1.136.Final—
io.netty:netty-codec-compression4.2.0.Final ... 4.2.9.Final (16 versions)4.2.16.Final—
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)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 84× 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 132 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-59901?
CVE-2026-59901 is a high vulnerability published on July 22, 2026. Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, the Bzip2Decoder handler in Netty's compression codec pipeline is vulnerable to a denial-of-service attack through a malformed bzip2 stream that permanently captures the…
When was CVE-2026-59901 disclosed?
CVE-2026-59901 was first published in the National Vulnerability Database on July 22, 2026, with the most recent update on August 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59901 actively exploited?
CVE-2026-59901 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 81.8% of all scored CVEs.
What is the CVSS score of CVE-2026-59901?
CVE-2026-59901 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-59901?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59901, 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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