CVE-2026-78661

Name of the Vulnerable Software and Affected Versions The product name cannot be determined. (affected versions not specified)

Description An issue exists when coalescing adjacent text nodes in addText and fosterParent functions. Appending to an existing TextNode's Data via string concatenation causes the accumulated string to be reallocated and copied on every token. This leads to O(n^2) allocations and byte copies when processing inputs containing numerous short text runs separated by ignored end tags.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.