NightmareEclipse's latest zero-day leaves Microsoft Defender stuck in the past
REG AD googletag.cmd.push(function() { googletag.display('labrador/thereg/article/desktop/c'); }); The trick doesn't disable Defender. Instead, the PoC waits for an update to start, then tries to fill up the drive so there isn't enough space for it to finish.The code does this by creating hidden temporary files sized to consume the drive's free space, spinning up additional threads as needed to claim more. That's a generic installation error, however, and isn't evidence on its own that BigDiskBuster is at work.Leaving Defender stuck on old security intelligence is obviously less than ideal.
- ▪REG AD googletag.cmd.push(function() { googletag.display('labrador/thereg/article/desktop/c'); }); The trick doesn't disable Defender.
- ▪Instead, the PoC waits for an update to start, then tries to fill up the drive so there isn't enough space for it to finish.The code does this by creating hidden temporary files sized to consume the drive's free space, spinning up additiona
- ▪That's a generic installation error, however, and isn't evidence on its own that BigDiskBuster is at work.Leaving Defender stuck on old security intelligence is obviously less than ideal.
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Story provenance
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Record
| Original publisher | The Register |
| Canonical URL | https://www.theregister.com/security/2026/09/22/nightmareeclipses-latest-zero-day-leaves-microsoft-defender-stuck-in-the-past/5298320 |
| Publication time | Tue, 22 Sep 2026 18:36:00 +0200 |
| Retrieval time | 2026-09-22T16:38:53.183Z |
| Last seen | 2026-09-22T16:38:53.183Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | l0CfZF1vNpUP · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
(function() { let windowUrl = window.location.href; windowUrl = windowUrl.substring(windowUrl.indexOf('?') + 1); let messageElement = document.querySelector('.shareableMessage'); if (windowUrl && windowUrl.includes('code') && windowUrl.includes('expires')) { messageElement.style.display = 'block'; } })(); security NightmareEclipse's latest zero-day leaves Microsoft Defender stuck in the past BigDiskBuster leaves Microsoft's antivirus running but unable to install updates Carly Page Carly Page Published tue 22 Sep 2026 // 17:36 UTC READ MORE Register reader hit with surprise bill after Microsoft portals disagreed 3 hours ago Gartner predicts 55% of enterprise VMware users will be investigating an exit by 2029 13 hours ago How Windows turned months of inactivity into a 7-hour update hostage…
Excerpt limited to ~120 words for fair-use compliance. The full article is at The Register.
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