Negative length handling flaw in libexpat XML_ParseBuffer

Successful exploitation can lead to memory-safety failure during XML parsing, resulting in unexpected application termination and potentially arbitrary code execution. The provided Apple advisory context states that a remote attacker may be able to cause unexpected app termination or arbitrary code execution in affected Apple software. Other affected downstream products, such as Dell iDRAC9 builds incorporating vulnerable libexpat versions, may inherit the same underlying risk depending on exposure and integration.

If immediate patching is not possible, reduce exposure of XML parsing paths that process untrusted input, especially remotely supplied XML data. Restrict or disable features that accept attacker-controlled XML where feasible, isolate affected services, and apply vendor updates for products bundling libexpat. No more specific workaround is provided in the supplied content.

Upgrade libexpat to version 2.6.3 or later. For downstream products, apply vendor fixes that incorporate the corrected libexpat release. The provided content specifically notes Dell iDRAC9 remediation in versions 7.00.00.181 or later and 7.20.30.50 or later for affected branches.