Even Claude agrees: hole in its sandbox was real and dangerous
Recent vulnerabilities in Claude Code's network sandbox have raised security concerns. Two bypass bugs were discovered, allowing unauthorized data exfiltration from the sandbox. Although Anthropic claims to have fixed the issues, there has been no public disclosure or CVE issued for the vulnerabilities.
- ▪Two bypass bugs in Claude Code's sandbox were reported, allowing sensitive data to be sent to any server on the internet.
- ▪The latest flaw involved a SOCKS5 hostname null-byte injection that could trick the sandbox's allowlist filter.
- ▪Anthropic fixed the vulnerabilities without issuing a CVE or security advisory, raising concerns about user awareness.
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| Original publisher | The Register |
| Canonical URL | https://www.theregister.com/security/2026/05/20/even-claude-agrees-hole-in-its-sandbox-was-real-and-dangerous/5243662 |
| Publication time | Wed, 20 May 2026 22:34:15 +0200 |
| Retrieval time | 2026-05-20T20:45:02.977Z |
| Last seen | 2026-05-20T20:45:02.977Z |
| 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 | ESVjlM3FdAAC |
| 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 |
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| 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 Even Claude agrees: hole in its sandbox was real and dangerous Another day, another AI bug silently fixed with no CVE and no public disclosure Jessica Lyons Jessica Lyons Published wed 20 May 2026 // 21:34 UTC Two now-patched bypass bugs in Claude Code’s network sandbox put users at risk, and one of these allows baddies to send anything inside the sandbox - credentials, source code, other private data - to any server on the internet, according to a researcher who found and…
Excerpt limited to ~120 words for fair-use compliance. The full article is at The Register.
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