CVE-2026-50506Network attack vector

Service interruption via unbounded OData message allocation

Published Jul 14, 2026 · Updated Jul 14, 2026

Resource exhaustion in Microsoft.AspNet.OData and Microsoft.AspNetCore.OData allows remote attackers to interrupt exposed web APIs. The OData message reader had no bounded MaxReceivedMessageSize default and allocated resources in proportion to attacker-controlled request content. Unauthenticated reachability is enough in Microsoft.AspNet.OData 7.0.0 through 7.7.9 and Microsoft.AspNetCore.OData 9.0.0 through 9.4.1.

CVSS severity7.5
High
EPSS probability1.17%
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 Microsoft.AspNet.OData and Microsoft.AspNetCore.OData allows remote attackers to interrupt exposed web APIs. The OData message reader had no bounded MaxReceivedMessageSize default and allocated resources in proportion to attacker-controlled request content. Unauthenticated reachability is enough in Microsoft.AspNet.OData 7.0.0 through 7.7.9 and Microsoft.AspNetCore.OData 9.0.0 through 9.4.1.

The record

CVE
CVE-2026-50506
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Microsoft
Product
Microsoft.AspNetCore.OData
Classifications
CWE-770, T1499.003
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?

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

  1. Affected versionversion=9.0.0 <9.5.0[SX1]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft.AspNetCore.ODataversion=9.0.0 <9.5.0[SX1]
Microsoft · Microsoft.AspNet.ODataversion=7.0.0 <7.8.0

Published CVSS scores

7.5Microsoft CorporationCVSS: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
T1499.003Application Exhaustion Flood

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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