The vector db just got an unauthenticated rce. chromadb's chromatoast flaw, flagged oct 11, lets…
the vector db just got an unauthenticated rce. chromadb's chromatoast flaw, flagged oct 11, lets anyone execute code before login by pointing the server at a malicious model repo.
the retrieval layer now needs a firewall.
Context
Verified date: HiddenLayer's ChromaToast Served Pre-Auth and the GitHub advisory are dated May 18, 2026. The flaw is CVE-2026-45829. ChromaDB's Python FastAPI server can instantiate user-controlled embedding function settings before checking access permissions, so an unauthenticated attacker with HTTP API access can trigger remote code execution.
The GitHub advisory lists affected versions from 1.0.0 up to 1.5.9.
The pre-authentication code execution matches HiddenLayer, GitHub and NVD, but the disclosure is dated May 18, 2026, not Oct 11. The sources describe user-controlled embedding function settings. That the trigger is pointing the server at a malicious model repo was not seen in the sources read, so unsupported here, not refuted. in the excerpts read. 'The retrieval layer now needs a firewall' is the author's opinion.
Related work
- GitHub: chroma-core security issue 7226 ↗Security report for the pre-authentication flaw.
- NVD detail for CVE-2026-45829 ↗Affected version data.
- HiddenLayer research ↗May 18, 2026.
Watch next
- Check whether an Oct 11 follow-up changed the affected versions.
Sources
- HiddenLayer: ChromaToast served pre-authhiddenlayer.com
- GitHub Advisory Database: ChromaDB pre-authentication code injection, CVE-2026-45829github.com
- NVD: CVE-2026-45829nvd.nist.gov
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 11 October 2026 at 21:34 IST. Sources are the papers and datasets the note draws on.
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