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Vulcora

protora-mbd-challenge-1

CriticalA hidden rule was witnessed in the weights.
#hidden-backdoor
assessed Jul 2026read offline · never run
Book the real read

A real read — read offline against the base, never run. The verdict is reproducible.

◆ Vulcora caught it — offline, against its base, with proof

Vulcora reads the weights
Off-the-shelf tools · run on this model0 of 1 that could read it flagged it
Signed research board · measured per-model0 of 6 research tools caught it · 3 ranked a clean model at or above it
BAIT (IEEE S&P 2025, target inversion): per-model suspicion — the two real backdoors rank last, inside the noise
decoy a0.9566
decoy b0.9556
decoy c0.9537
decoy d0.9514
decoy e0.9508
mirror model00.9483
wolf model30.9477

clean base 0.949 · spread 0.0089 = noise, not a signal

Capability — not run on this modelwhat these tools read and what question they answer — not a result
  • model-signingOpenSSF / Sigstoreprovenance

    reads Sigstore signature bundles

    verifying a cryptographic provenance signature over model files; it can only attest what a publisher signed.

    requires a published Sigstore bundle; no scanned model ships one

1 off-the-shelf tool could read this model’s serialized files, and none flagged it. None of them reads what the weights mean: they hunt load-time code-execution, repo smells, or a provenance signature — real jobs, none of which is weight-level tampering. 3 other tools had nothing of the kind they read here. Vulcora reads the weights — offline, and never runs the model.

Couldn't reach the attestation service to re-verify just now.

Deeper readings

the full disposition & integrity reads — worth craving

Details

from the artifact’s public metadata
Architecture
SmolLM2
Base
SmolLM2-135M-Instruct · HuggingFaceTB
License
apache-2.0
Parameters
135M

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Refutations are actor-gated — a guest can't file one.

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