CVE-2026-6860Public exploitNetwork attack vector

TLS service interruption via unbounded SNI cache

Published May 6, 2026 · Updated May 6, 2026

Resource exhaustion in Eclipse Vert.x 4.3.4 through 4.5.26 and 5.0.0 through 5.0.11 allows remote attackers to interrupt TLS services. The server-side SNI SslContext cache uses computeIfAbsent on each attacker-controlled matching hostname without a size bound, TTL, or eviction. Exploitation requires server-side SNI with wildcard or broad hostname mappings and causes retained contexts and rising memory use.

CVSS severity6.9
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Eclipse Vert.x 4.3.4 through 4.5.26 and 5.0.0 through 5.0.11 allows remote attackers to interrupt TLS services. The server-side SNI SslContext cache uses computeIfAbsent on each attacker-controlled matching hostname without a size bound, TTL, or eviction. Exploitation requires server-side SNI with wildcard or broad hostname mappings and causes retained contexts and rising memory use.

The record

CVE
CVE-2026-6860
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Eclipse Foundation
Product
Eclipse Vert.x
Classifications
CWE-770, CWE-295, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.3.4 <=4.5.26
  2. Affected versionversion=5.0.0 <=5.0.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Eclipse Foundation · Eclipse Vert.xversion=4.3.4 <=4.5.26; version=5.0.0 <=5.0.11

Published CVSS scores

5.3GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
6.9Eclipse FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CWE-295Improper Certificate Validation
T1499.003Application Exhaustion Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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