CVE-2026-8177 SHLOMIF CVE debrief

Who should care

Organizations using Perl processes that parse XML node names, especially those passing attacker-controlled strings to XML::LibXML's DOM node-name methods, should prioritize patching. This includes developers and administrators of systems using XML::LibXML for XML processing. Red Hat and other Linux distributions may also be affected, as indicated by Red Hat's security advisories.

Technical summary

The vulnerability occurs when an XML node name ends in the middle of a multi-byte UTF-8 sequence, causing the parser to read past the end of the input string into adjacent heap memory. This out-of-bounds read can lead to a crash, resulting in a denial-of-service (DoS) attack. The issue is triggered by passing attacker-controlled strings to XML::LibXML's DOM node-name methods. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, indicating a high severity. CWE-125 is associated with this vulnerability.

Defensive priority

High priority should be given to patching XML::LibXML to version 2.0211 or later. In the meantime, validate and sanitize all input strings to prevent truncated UTF-8 sequences from being passed to XML::LibXML's DOM node-name methods.

Recommended defensive actions

• Patch XML::LibXML to version 2.0211 or later
• Validate and sanitize all input strings to prevent truncated UTF-8 sequences
• Monitor for suspicious XML parsing activity
• Implement additional security measures to prevent DoS attacks
• Review and update XML processing workflows to ensure secure practices

Evidence notes

The CVE record and NVD detail provide official information on the vulnerability. Red Hat has also published advisories and a bug report related to this issue. The XML::LibXML project has released patches and updates to address the vulnerability.

Official resources