Poisoned Google SERPs

Since mid-September 2026, a large-scale change in Google’s responses to automated queries has produced complete-looking search pages whose organic results have been swapped out, a phenomenon labeled “poisoned” SERPs. Analysis of 27.5 million SERPs across 49 countries and multiple devices found poisoned pages first appearing on September 20 after requests began failing on September 13. Overall 8.0% of SERPs since then met the study’s poisoned definition (baseline 0.17%), with peaks of ~25-27% on late-September days. A poisoned SERP shows no error or captcha and uses the normal template, but fewer than half of a keyword’s usual top sites appear anywhere on the page; pagination often shortens and total page-1 results change. The effect is systematic enough that rank trackers mistake it for genuine ranking crashes.

The replacements are not random: social platforms and forums (Reddit, Facebook, LinkedIn, Instagram, Quora) appear more often on poisoned pages while YouTube, Yelp and MapQuest appear less. Tracked sites fall out of the top 10 on 58.6% of poisoned SERPs versus 2.7% previously, and a typical poisoned SERP’s usual sites return within three days 77.9% of the time. Geographic variation is notable (Australia ~11.5%, India ~10.9%, Canada ~10.5%, US ~8.5%, UK ~3.0%) and device differences are small. Because poisoned pages look legitimate, they cause false positives in ranking reports and reflect Google’s countermeasures to bulk AI scraping and grounding.