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CVE-2026-7307· NVD / CVE Program· CNA redhat

Keycloak: keycloak: denial of service via specially crafted saml input

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1% (FIRST EPSS); higher than 62.4% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: github.com/keycloak/keycloak keycloak 26.2.16, 26.4.12, 26.6.2.

Low priority for now. Upgrade to github.com/keycloak/keycloak keycloak 26.2.16, 26.4.12, 26.6.2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language (SAML) endpoint. This malicious input can cause high CPU usage and worker thread starvation, leading to a Denial of Service (DoS) where the server becomes unavailable.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
May 19, 2026
Updated
Oct 6, 2026
EPSS
1.0% · 62th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.0%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-7307

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
redhatbuild of keycloak

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • redhat build of keycloak26.4 and later · before 26.4.12

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • github.com/keycloak/keycloak keycloak

    • before 26.2.16affected · semver
    • before 26.4.12affected · semver
    • before 26.6.2affected · semver

  • Red Hat Red Hat build of Keycloak 26.2

    • 26.2.16-1 and laternot affected · rpm
    • 26.2-21 and laternot affected · rpm
    • 26.2-21 and laternot affected · rpm

  • Red Hat Red Hat build of Keycloak 26.2.16

    • all versionsunknown

  • Red Hat Red Hat build of Keycloak 26.4

    • 26.4.12-1 and laternot affected · rpm
    • 26.4-17 and laternot affected · rpm
    • 26.4-17 and laternot affected · rpm

  • Red Hat Red Hat build of Keycloak 26.4.12

    • all versionsunknown

  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 7

    • 0:18.0.20-1.redhat_00001.1.el7sso and laternot affected · rpm

  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 8

    • 0:18.0.20-1.redhat_00001.1.el8sso and laternot affected · rpm

  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 9

    • 0:18.0.20-1.redhat_00001.1.el9sso and laternot affected · rpm

  • Red Hat Red Hat Single Sign-On 7.6.13

    • all versionsunknown

  • Red Hat RHEL-8 based Middleware Containers

    • 7.6-85 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Mavenorg.keycloak:keycloak-saml-corebefore 26.6.226.6.2

Same product

redhat: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-16442Keycloak-services: keycloak-services: saml idp-initiated broker login bypasses link-only restriction
    39Monitor
  • CVE-2026-16443Keycloak-services: keycloak-services: saml broker metadata import disables response signature validation
    36Monitor
  • CVE-2026-15572Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation
    35Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-7504May 19, 2026 · Org.keycloak/keycloak-services: open redirect when using wildcard valid redirect uris in keycloak
    32Monitor
  • ← EarlierCVE-2026-7571May 19, 2026 · Keycloak: keycloak: access token disclosure and implicit flow bypass via forged client data
    28Monitor
  • Later →CVE-2026-7507May 19, 2026 · Org.keycloak/keycloak-services: session fixation in oidc login flow that can lead to account takeover
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
github.com/keycloak/keycloak keycloak26.2.16Vendor (CNA)
github.com/keycloak/keycloak keycloak26.4.12Vendor (CNA)
github.com/keycloak/keycloak keycloak26.6.2Vendor (CNA)
Maven:org.keycloak:keycloak-saml-core26.6.2Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-1286 · Improper Validation of Syntactic Correctness of Input

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (11 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records