Medium [CVE-2026-86139] Integer overflow in xmlURIEscapeStr may lead to arbitrary code execution
This medium-severity Red Hat Linux advisory covers CVE-2026-86139 affecting Red Hat Hardened Images.
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Summary
A flaw was found in libxml2. An integer overflow vulnerability exists in the `xmlURIEscapeStr` function within `uri.c`.
This flaw could potentially lead to memory corruption, allowing an attacker to achieve information disclosure or arbitrary code execution. Red Hat severity: Moderate.
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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