High [CVE-2026-86140] Arbitrary code execution via stack-based buffer overflow in xmlSnprintfElements
This high-severity Red Hat Linux advisory covers CVE-2026-86140 affecting Red Hat Hardened Images.
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Summary
A flaw was found in libxml2, a software library for parsing XML (Extensible Markup Language) documents. The `xmlSnprintfElements` function within this library is vulnerable to a stack-based buffer overflow, a type of memory corruption.
A local attacker could exploit this flaw without requiring privileges or user interaction, potentially leading to arbitrary code execution or a denial of service. Red Hat severity: Important — CVSS 8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L).
Weakness: CWE-120. Affected Red Hat products: Red Hat Hardened Images.
Red Hat does not currently list a fixing RHSA for this CVE.
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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