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CVE-2026-11979 affects libxml2 through version 2.15.3. Multiple stack-based buffer overflows exist in the xmlcatalog utility's usershell() function when xmlcatalog runs in --shell mode. The function parses user-controlled input into fixed-size stack buffers, including command, arg, and argv, without adequate length validation. An overly long input line can corrupt the xmlcatalog stack frame.
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A libxml2 xmlcatalog utility flaw in --shell mode caused by fixed-size stack buffers lacking bounds checks in usershell(). An overly long input line can corrupt stack memory, causing a crash and potentially arbitrary code execution in the xmlcatalog process context. The issue was fixed in commit c2e233fc.
A vulnerability identified as CVE-2026-11979 affecting libxml2-related packages on Rocky Linux 8. The supplied CVSS vectors characterize it as a local attack requiring user interaction, with potential high impact to confidentiality, integrity, and availability under CVSS v3.
A referenced vulnerability covered by the Rocky Linux libxml2 security advisory; no technical vulnerability details are provided in the content.
A vulnerability affecting libxml2 packages on Oracle Linux 10, including libxml2, libxml2-devel, libxml2-static, and python3-libxml2. Successful exploitation requires local access and user interaction and can result in high impacts to confidentiality, integrity, and availability.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.