CVE-2026-42577

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 67% 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
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Netty is an asynchronous, event-driven network application framework. From 4.2.0.Final to 4.2.13.Final , Netty's epoll transport fails to detect and close TCP connections that receive a RST after being half-closed, leading to stale channels that are never cleaned up and, in some code paths, a 100% CPU busy-loop in the event loop thread. This vulnerability is fixed in 4.2.13.Final.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
32.9%
KEV
Not listed

Published

May 13, 2026

Last Modified

May 18, 2026

Advisory Details (3)

Auto-updated May 13, 2026
Patch available. Sources: github.
github Patch Available

Netty epoll transport denial of service via RST on half-closed TCP connection · Advisory · netty/netty · GitHub

https://github.com/netty/netty/security/advisories/GHSA-rwm7-x88c-3g2p
generic

Epoll: Correctly delete fd from epoll if there is nothing to handle by normanmaurer · Pull Request #16689 · netty/netty · GitHub

https://github.com/netty/netty/pull/16689
generic

Epoll: Correctly delete fd from epoll if there is nothing to handle (… · netty/netty@0ec3d97 · GitHub

https://github.com/netty/netty/commit/0ec3d97fab376e243d328ac95fbd288ba0f6e22d

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
io.netty:netty-transport-native-epoll4.2.0.Final ... 4.2.9.Final (13 versions)4.2.13.Final—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× 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 111 total refreshes for this CVE.

  1. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-09 19:10 UTCEPSS rescore
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  1. 2026-06-24 14:05 UTCEPSS rescore
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  22. 2026-06-13 04:46 UTCEG score recompute
  23. 2026-06-12 23:12 UTCEPSS rescore
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  25. 2026-06-12 16:31 UTCEG score recompute
  26. 2026-06-12 04:15 UTCEG score recompute
  27. 2026-06-11 16:52 UTCEG score recompute
  28. 2026-06-11 14:00 UTCEPSS rescore
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  30. 2026-06-10 22:18 UTCEPSS rescore
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  38. 2026-06-08 14:17 UTCEPSS rescore
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  40. 2026-06-08 08:07 UTCEG score recompute
  41. 2026-06-07 20:47 UTCEG score recompute
  42. 2026-06-07 15:25 UTCEPSS rescore
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  44. 2026-06-07 09:26 UTCEG score recompute
  45. 2026-06-06 22:06 UTCEG score recompute
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  62. 2026-06-02 16:02 UTCEG score recompute
  63. 2026-06-02 04:41 UTCEG score recompute
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  65. 2026-06-01 13:52 UTCEPSS rescore
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  68. 2026-05-31 22:30 UTCEPSS rescore
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  70. 2026-05-31 00:16 UTCEPSS rescore
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  72. 2026-05-29 13:44 UTCEPSS rescore
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  74. 2026-05-28 13:44 UTCEPSS rescore
  75. 2026-05-28 13:44 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-42577?
CVE-2026-42577 is a high vulnerability published on May 13, 2026. Netty is an asynchronous, event-driven network application framework. From 4.2.0.Final to 4.2.13.Final , Netty's epoll transport fails to detect and close TCP connections that receive a RST after being half-closed, leading to stale channels that are never cleaned up and, in some code paths, a 100%…
When was CVE-2026-42577 disclosed?
CVE-2026-42577 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-2026-42577 actively exploited?
CVE-2026-42577 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42577?
CVE-2026-42577 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-42577?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42577, 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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