CVE-2026-15711Network attack vector

Unauthenticated application crash via oversized control frames

Published Jul 14, 2026 · Updated Jul 14, 2026

Denial of service in Red Hat Enterprise Linux 8 through 10 allows remote attackers to crash libsoup WebSocket applications. The control-frame parser in soup-websocket-connection.c accepts PING, PONG, or CLOSE payloads over 125 bytes instead of rejecting the connection, disrupting its state machine. No authentication or user interaction is required, but only applications using libsoup for WebSocket networking are exposed, and the reported impact is process or connection termination.

CVSS severity7.5
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Red Hat Enterprise Linux 8 through 10 allows remote attackers to crash libsoup WebSocket applications. The control-frame parser in soup-websocket-connection.c accepts PING, PONG, or CLOSE payloads over 125 bytes instead of rejecting the connection, disrupting its state machine. No authentication or user interaction is required, but only applications using libsoup for WebSocket networking are exposed, and the reported impact is process or connection termination.

The record

CVE
CVE-2026-15711
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 10
Classifications
CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

7.5Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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