CVE-2026-7307Network attack vector

Service interruption via nonterminating SAML parser loops

Published May 19, 2026 · Updated May 19, 2026

Denial of service in Keycloak before 26.6.2 allows remote attackers to make the server unavailable through malformed SAML 1.1 XML. SAML11ParserUtil parsing loops fail to reject unexpected character events, so malformed text leaves request processing spinning instead of terminating with a parsing error. No authentication or user interaction is required; repeated requests consume CPU and starve worker threads, interrupting the Keycloak service.

CVSS severity7.5
High
EPSS probability0.74%
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 Keycloak before 26.6.2 allows remote attackers to make the server unavailable through malformed SAML 1.1 XML. SAML11ParserUtil parsing loops fail to reject unexpected character events, so malformed text leaves request processing spinning instead of terminating with a parsing error. No authentication or user interaction is required; repeated requests consume CPU and starve worker threads, interrupting the Keycloak service.

The record

CVE
CVE-2026-7307
Published
May 19, 2026
Updated
May 19, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1286, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 19, 2026CVE publishedPublication date reported by the CVE source.
  2. May 19, 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 buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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-1286Improper Validation of Syntactic Correctness of Input
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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