GHSA-cpf7-j4cf-vqx4

Source

https://github.com/advisories/GHSA-cpf7-j4cf-vqx4

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-cpf7-j4cf-vqx4/GHSA-cpf7-j4cf-vqx4.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-cpf7-j4cf-vqx4

Aliases

CVE-2026-9803

Published

2026-05-28T06:31:10Z

Modified

2026-07-01T21:45:23.127828861Z

Severity

5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator

Summary

Keycloak has an Out-of-bounds Read

Details

A flaw was found in Keycloak's ClientRegistrationAuth component. A remote unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with a malformed 'Authorization: Bearer' header to any client registration endpoint. This can lead to an ArrayIndexOutOfBoundsException, causing the server to return an HTTP 500 error and resulting in a Denial of Service (DoS) for the affected service.

Database specific

{
    "github_reviewed_at": "2026-07-01T21:27:37Z",
    "nvd_published_at": "2026-05-28T06:16:29Z",
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-125"
    ],
    "severity": "MODERATE"
}

References

Affected packages

Maven / org.keycloak:keycloak-services

Package

Name: org.keycloak:keycloak-services; View open source insights on deps.dev
Purl: pkg:maven/org.keycloak/keycloak-services

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Last affected

26.4.7

Affected versions

1.*

1.0-alpha-1

1.0-alpha-1-12062013

1.0-alpha-2

1.0-alpha-3

1.0-alpha-4

1.0-beta-1

1.0-beta-1-20150521

1.0-beta-1-20150523

1.0-beta-2

1.0-beta-3

1.0-beta-4

1.0-rc-1

1.0-rc-2

1.0-final

1.0.1.Final

1.0.2.Final

1.0.3.Final

1.0.4.Final

1.0.5.Final

1.1.0.Beta1

1.1.0.Beta2

1.1.0.Final

1.1.1.Final

1.2.0.Beta1

1.2.0.CR1

1.2.0.Final

1.3.0.Final

1.3.1.Final

1.4.0.Final

1.5.0-Final

1.5.0.Final

1.5.1.Final

1.6.0.Final

1.6.1.Final

1.7.0.CR1

1.7.0.Final

1.8.0.Alpha1

1.8.0.CR1

1.8.0.CR2

1.8.0.CR3

1.8.0.Final

1.8.1.Final

1.9.0.CR1

1.9.0.Final

1.9.1.Final

1.9.2.Final

1.9.3.Final

1.9.4.Final

1.9.5.Final

1.9.7.Final

1.9.8.Final

2.*

2.0.0.CR1

2.0.0.Final

2.1.0.CR1

2.1.0.Final

2.2.0.CR1

2.2.0.Final

2.2.1.Final

2.3.0.CR1

2.3.0.Final

2.4.0.CR1

2.4.0.Final

2.5.0.CR1

2.5.0.Final

2.5.1.Final

2.5.4.Final

2.5.5.Final

3.*

3.0.0.CR1

3.0.0.Final

3.1.0.CR1

3.1.0.Final

3.2.0.CR1

3.2.0.Final

3.2.1.Final

3.3.0.CR1

3.3.0.CR2

3.3.0.Final

3.4.0.CR1

3.4.0.Final

3.4.1.CR1

3.4.1.Final

3.4.2.Final

3.4.3.Final

4.*

4.0.0.Beta1

4.0.0.Beta2

4.0.0.Beta3

4.0.0.Final

4.1.0.Final

4.2.0.Final

4.2.1.Final

4.3.0.Final

4.4.0.Final

4.5.0.Final

4.6.0.Final

4.7.0.Final

4.8.0.Final

4.8.1.Final

4.8.2.Final

4.8.3.Final

5.*

5.0.0

6.*

6.0.0

6.0.1

7.*

7.0.0

7.0.1

8.*

8.0.0

8.0.1

8.0.2

9.*

9.0.0

9.0.2

9.0.3

10.*

10.0.0

10.0.1

10.0.2

11.*

11.0.0

11.0.1

11.0.2

11.0.3

12.*

12.0.0

12.0.1

12.0.2

12.0.3

12.0.4

13.*

13.0.0

13.0.1

14.*

14.0.0

15.*

15.0.0

15.0.1

15.0.2

15.1.0

15.1.1

16.*

16.0.0

16.1.0

16.1.1

17.*

17.0.0

17.0.1

18.*

18.0.0

18.0.1

18.0.2

19.*

19.0.0

19.0.1

19.0.2

19.0.3

20.*

20.0.0

20.0.1

20.0.2

20.0.3

20.0.4

20.0.5

21.*

21.0.0

21.0.1

21.0.2

21.1.0

21.1.1

21.1.2

22.*

22.0.0

22.0.1

22.0.2

22.0.3

22.0.4

22.0.5

23.*

23.0.0

23.0.1

23.0.2

23.0.3

23.0.4

23.0.5

23.0.6

23.0.7

24.*

24.0.0

24.0.1

24.0.2

24.0.3

24.0.4

24.0.5

25.*

25.0.0

25.0.1

25.0.2

25.0.3

25.0.4

25.0.5

25.0.6

26.*

26.0.0

26.0.1

26.0.2

26.0.3

26.0.4

26.0.5

26.0.6

26.0.7

26.0.8

26.1.0

26.1.1

26.1.2

26.1.3

26.1.4

26.1.5

26.2.0

26.2.1

26.2.2

26.2.3

26.2.4

26.2.5

26.3.0

26.3.1

26.3.2

26.3.3

26.3.4

26.3.5

26.4.0

26.4.1

26.4.2

26.4.3

26.4.4

26.4.5

26.4.6

26.4.7

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-cpf7-j4cf-vqx4/GHSA-cpf7-j4cf-vqx4.json"

Maven / org.keycloak:keycloak-services

Package

Name: org.keycloak:keycloak-services; View open source insights on deps.dev
Purl: pkg:maven/org.keycloak/keycloak-services

Affected ranges

Type: ECOSYSTEM
Events: Introduced

26.5.0

Fixed

26.6.3

Affected versions

26.*

26.5.0

26.5.1

26.5.2

26.5.3

26.5.4

26.5.5

26.5.6

26.5.7

26.6.0

26.6.1

26.6.2

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-cpf7-j4cf-vqx4/GHSA-cpf7-j4cf-vqx4.json"