High [CVE-2026-56859] Denial of Service via XML decoding recursion depth issue
This high-severity Red Hat Linux advisory covers CVE-2026-56859 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
Previously, DecodeElement would reset the depth counter causing it to never fire; this could lead to stack exhaustion. A flaw was found in the `encoding/xml` package of Go.
The `DecodeElement` function failed to correctly track recursion depth, which could lead to stack exhaustion. A remote attacker could exploit this vulnerability by providing a specially crafted XML input, resulting in a Denial of Service (DoS) for the affected application.
This vulnerability arises from an issue in XML decoding where a recursion depth counter fails to reset, potentially leading to stack exhaustion when processing malicious XML input. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-776.
Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions; and 53 more.
Affected products named by the advisory: Red Hat Enterprise Linux 9.6 Extended Update Support; Custom Metric Autoscaler 2.19; Logging Subsystem for Red Hat OpenShift 6.6; OpenShift API for Data Protection 1.5; and 49 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
- golang-0:1.26.7-1.el10_2
- golang-github-openprinting-ipp-usb-0:0.9.27-7.el10_2.3
- grafana-0:10.2.6-28.el10_2.5
- opentelemetry-collector-0:0.152.1-2.el10_2
- image-builder-0:52.1-1.el10_2.2
- osbuild-composer-0:165.1-3.el10_2.2
- golang-0:1.26.7-1.el10_0
- ignition-0:2.21.0-3.el10_0.4
- delve-0:1.26.1-2.el10_0
- osbuild-composer-0:134.1-12.el10_0
- go-toolset:rhel8-8100020260824145918.a3795dee
- grafana-0:9.2.10-33.el8_10
- container-tools:rhel8-8100020260901110702.afee755d
- osbuild-composer-0:101.5-2.el8_10
- golang-0:1.26.7-1.el9_8
- grafana-0:10.2.6-23.el9_8.3
- opentelemetry-collector-0:0.152.1-2.el9_8
- osbuild-composer-0:165.1-4.el9_8.1
- image-builder-0:52.1-1.el9_8.2
- golang-0:1.26.7-1.el9_2
- osbuild-composer-0:76.1-9.el9_2
- ignition-0:2.15.0-2.el9_2.1
- golang-0:1.26.7-1.el9_4
- osbuild-composer-0:101.3-4.el9_4.6
- ignition-0:2.17.0-2.el9_4.2
- golang-0:1.26.7-1.el9_6
- osbuild-composer-0:132.2-12.el9_6
- ignition-0:2.21.0-7.el9_6.1
- custom-metrics-autoscaler/custom-metrics-autoscaler-adapter-rhel9:1788361753
- custom-metrics-autoscaler/custom-metrics-autoscaler-admission-webhooks-rhel9:1788361758
- custom-metrics-autoscaler/custom-metrics-autoscaler-http-add-on-interceptor-rhel9:1788290523
- custom-metrics-autoscaler/custom-metrics-autoscaler-http-add-on-operator-rhel9:1788290620
- custom-metrics-autoscaler/custom-metrics-autoscaler-http-add-on-scaler-rhel9:1788290333
- custom-metrics-autoscaler/custom-metrics-autoscaler-operator-bundle:1788363289
- custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9:1788361799
- custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9-operator:1788290121
- openshift-logging/eventrouter-rhel9:1788375796
- oadp/oadp-velero-rhel9:1788860461
- rhdh/rhdh-rhel9-operator:1788278786
- golang1-26-main-1.26.6-0.1.hum1
- RHSA-2026:60306
- RHSA-2026:62631
- RHSA-2026:63022
- RHSA-2026:65116
- RHSA-2026:65534
- RHSA-2026:65895
- RHSA-2026:61882
- RHSA-2026:65335
- RHSA-2026:65918
- RHSA-2026:66327
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
Mitigation checklist
- Mitigation 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.
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
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