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No exploitation reportedFix available

CVE-2026-2575

No exploitation reported by the sources we read.

  • Published2026-03-18
  • Fixed in26.4.10
  • WeaknessCWE-409

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A flaw was found in Keycloak. An unauthenticated remote attacker can trigger an application level Denial of Service (DoS) by sending a highly compressed SAMLRequest through the SAML Redirect Binding. The server fails to enforce size limits during DEFLATE decompression, leading to an OutOfMemoryError (OOM) and subsequent process termination. This vulnerability allows an attacker to disrupt the availability of the service.

Timeline

dates in UTC
  1. 2026-03-1804:17CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-2575?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-2575?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Redhat build of keycloak
BranchAffectedFixed in
26.4≥ 26.4, < 26.4.1026.4.10
26.4≥ 26.4.0, < 26.4.1026.4.10
keycloak-saml-adapter-core
BranchAffectedFixed in
26.5< 26.5.426.5.4
keycloak-saml-core
BranchAffectedFixed in
26.5< 26.5.426.5.4

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • RHSA-2026:76128 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat Single Sign-On 7.6.13 security update on RHEL 7

  • RHSA-2026:76130 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat Single Sign-On 7.6.13 security update on RHEL 9

  • RHSA-2026:76129 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat Single Sign-On 7.6.13 security update on RHEL 8

  • RHSA-2026:76134 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat Single Sign-On 7.6.13 for OpenShift image security update

  • RHSA-2026:76132 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Single Sign-On 7.6.13 security update

Full record on NVD

Fix

  1. Update Redhat build of keycloak to 26.4.10
  2. Vendor fix Red Hat Product Security RHSA-2026:76128 · 3 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  3. Vendor fix Red Hat Product Security RHSA-2026:76134 · 3 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  4. Vendor fix Red Hat Product Security RHSA-2026:76132 · 1 productBefore applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on. The References section of this erratum contains a download link (you must log in to download the update).
  5. Workaround from the vendor Red Hat Product Security RHSA-2026:76128 · 3 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-03-18
  • OpenCVESSVC decisionnone—
  • CNACVSS 3.15.3read 2026-10-23
  • CNAweakness (CWE)CWE-409read 2026-10-23
  • FIRST EPSSEPSS score0.9 %2026-10-22
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Published
2026-03-18
Last Modified
2026-10-06
NVD status
Modified

Frequently asked questions

What is CVE-2026-2575?

A flaw was found in Keycloak. An unauthenticated remote attacker can trigger an application level Denial of Service (DoS) by sending a highly compressed SAMLRequest through the SAML Redirect Binding. The server fails to enforce size limits during DEFLATE decompression, leading to an OutOfMemoryError (OOM) and subsequent process termination. This vulnerability allows an attacker to disrupt the availability of the service.

Is CVE-2026-2575 actively exploited?

Active exploitation of CVE-2026-2575 has not been confirmed. Its EPSS score was 0.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-2575?

CVE-2026-2575 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

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