Medium [CVE-2026-86143] Data integrity issues due to integer overflow in write callbacks
This medium-severity Red Hat Linux advisory covers CVE-2026-86143 affecting Red Hat Hardened Images.
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Summary
A flaw was found in libxml2. An integer overflow vulnerability exists in the xmlIO module, where an inconsistency between xmlOutputWriteCallback and xmlBufUse can cause negative length values to be passed to write callbacks.
This occurs when the accumulated data backlog exceeds the maximum integer value. This issue can lead to an unsafe state in downstream callback logic, potentially resulting in data corruption or other integrity and confidentiality impacts.
Red Hat severity: Moderate — CVSS 6.9 (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L). Weakness: CWE-190.
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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