SECURITY.md

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Security policy

Reporting a vulnerability

Please do not file public GitHub issues for security vulnerabilities.

Preferred: open a private report through GitHub Security Advisories at https://github.com/officialunofficial/mkit/security/advisories/new. This routes the report to the maintainers privately, gives us a place to collaborate on a fix, and produces a CVE on request.

If you cannot use GitHub Security Advisories for any reason, contact the maintainers privately by opening a draft PR titled SECURITY: contact me out-of-band (no details in the body) and we will reach out.

We aim to:

Acknowledge your report within 72 hours.
Provide a triage update within 7 days.
Ship a fix (or publish a mitigation) within 90 days of initial report, coordinated with you on disclosure timing.

If you do not hear back within the acknowledgement window, please nudge us — notifications can drop.

Supported versions

Only the latest minor line receives security fixes.

Version	Supported
0.3.x	Yes (current)
< 0.3	No

Pre-1.0 releases may ship breaking format changes alongside security fixes. Read the CHANGELOG before upgrading.

Coordinated disclosure

Day 0: You file a report via GitHub Security Advisories.
Day 0–7: We triage, confirm scope, and assign a CVE if warranted.
Day 7–60: We fix, test, and prepare a coordinated release. We may request your review of the patch.
Day ≤90: Public advisory published, CHANGELOG entry, and a patched release. Credit given to the reporter unless you ask to remain anonymous.

We will not pursue legal action against researchers who follow this process in good faith, including accidental disclosure during testing.

Local attack surface — initial posture

The initial release narrows the local attack surface around keys and config. Briefly:

Per-repo config attack surface partitioned. Security-sensitive keys (key paths, external-signer path/argv, SSH trust knobs) are now user-scoped only. A <repo>/.mkit/config that tries to set them is rejected with a warning and the value is ignored.
Key file handling. Key files are opened with O_NOFOLLOW, written atomically (tmp plus fsync plus rename plus parent fsync), and owner-checked against the running euid. Parent directory is enforced 0700.
Trust roots scope-corrected. mkit verify-attest defaults to $XDG_CONFIG_HOME/mkit/trust-roots.toml, not a repo-local path, so a hostile clone cannot choose its own verifier.

Full description, attacker models, and verification gates in docs/THREAT-MODEL.md.

PGP / signed reports

We don't publish a long-lived PGP key. GitHub Security Advisories provides transport-layer privacy and a private collaboration channel, which we believe is sufficient for the current scope. If you have a strong need for end-to-end encryption beyond TLS, mention this in the initial advisory and we'll arrange an out-of-band channel.

Bug bounty

We do not currently offer a paid bug bounty. Researchers will be credited in the published advisory and in CHANGELOG.md.

Export control

This project contains cryptographic software (BLAKE3, Ed25519, secp256k1, P-256, AES, rustls/TLS). Source code distribution is covered under the publicly-available open-source exemption (US EAR §740.13(e); ECCN 5D002.c.1; License Exception TSU). A §740.13(e) notification has been provided to BIS (crypt@bis.doc.gov) and ENC (enc@bis.doc.gov) at the time of public launch.

Scope

In scope:

The mkit binary and the Rust workspace under rust/crates/ — including the library crates published to crates.io (mkit-core, mkit-rpc, mkit-attest, mkit-keystore, mkit-git-bridge, mkit-sync, the mkit-transport-* crates).
The reference external signers under contrib/signers/.
Release pipeline integrity (signing, SBOM, reproducibility claims).
On-disk format parsers (v1 format documented in docs/specs/SPEC-*.md).

Out of scope (please report to upstream instead):

Vulnerabilities in the Rust compiler / standard library.
Vulnerabilities in operating-system libraries linked at runtime.

Preview

Security policy

Reporting a vulnerability

Supported versions

Coordinated disclosure

Local attack surface — initial posture

PGP / signed reports

Bug bounty

Export control

Scope

Files

Security policy

Reporting a vulnerability

Supported versions

Coordinated disclosure

Local attack surface — initial posture

PGP / signed reports

Bug bounty

Export control

Scope