CVE-2026-76243Critical▾ Midnightstigmem-node: Auth-disabled deployments may grant broad anonymous access outside loopback
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 52.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 20.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
0.4%
Stigmem nodes configured with authentication disabled could grant the anonymous identity broad read/write/federation capabilities if exposed outside a loopback-only local development environment. Impacted users are operators who intentionally disabled authentication while binding the node to a non-loopback URL.
Patched in 0.9.0a2. The node now refuses unauthenticated operation outside loopback-only local development.
Before upgrading, keep authentication enabled for all non-local deployments and do not expose nodes with authentication disabled to untrusted networks.
Upgrade to the patched release:
pip install --upgrade --pre stigmem-node
If developers install through the Stigmem meta-package instead, they should use the matching extra for their deployments, for example:
pip install --upgrade --pre 'stigmem[node]'
stigmem-node < 0.9.0a2Upgrade to a patched release:
stigmem-node 0.9.0a2Connected by shared product, vendor, weakness, or advisory.
CVE-2026-76245Highstigmem (pip package stigmem-node) version 0.9.0a1 contains a timestamp-handling mismatch in federation peer-token validation that can cause valid peer tokens to be incorrectly treated as expired
CVE-2026-76241Highstigmem-node 0.9.0a1 allows plugin signature enforcement to be disabled via a single configuration flag without a second explicit acknowledgment
CVE-2026-76242Criticalstigmem-node 0.9.0a1 accepts federation peer key material during peer registration without a separate administrator out-of-band fingerprint approval step
CVE-2026-76240Highstigmem-node 0.9.0a1 interpolates Postgres backend schema identifiers into SQL strings without defensive quoting
CVE-2026-76237Highstistigmem-node: quarantine review surface exposes and mutates other tenants' quarantined facts (cross-tenant BOLA)
CVE-2026-76236Highstigmem-node before 0.9.0a12 contains a cross-tenant broken object level authorization (BOLA) flaw in the RTBF (right-to-be-forgotten) tombstone mechanism