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 Assisted Installer for Red Hat OpenShift Container Platform 2, AWS Load Balancer Operator, Builds for Red Hat OpenShift.
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Summary
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. 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: Assisted Installer for Red Hat OpenShift Container Platform 2; AWS Load Balancer Operator; Builds for Red Hat OpenShift; cert-manager Operator for Red Hat OpenShift; and 52 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 · medium-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source
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