Maintainer and Metadata¶

Who owns the package changed (H026, H044, H058, H074, C006), or a property that held for a long run of observations changed (H037, H047, H049, H050, H051, H054, H063).

The longitudinal rules do not read a diff at all. They read PropertyBreak records from the corpus property layer, gated by [longitudinal] stability_floor (default 10): a value must hold at least that many consecutive observations before a change is reported. Every one of them is silent on a cold database by construction, because the first observation of a property only inserts it.

See the rule system reference for the field table, the severity weights and the reserved identifier ranges.

Rules on this page¶

C006: Maintainer Change With New Source Domain¶

• Severity: HIGH (weight 25)
• Condition: The maintainer changed and at least one added source URL is on a domain not present among the removed URLs.
• Description: Either signal alone is routine; maintainers change hands, domains migrate. Together they are the shape of an account takeover redirecting sources to attacker-controlled infrastructure. Requires maintainer metadata, so it fires only in the live path, not in offline corpus replay.

H026: Untrusted Maintainer Takeover¶

• Target: programmatic (maintainer delta + global novelty)
• Severity: HIGH (weight 25) - always on; corpus rate TBD (requires live git history)
• Category: maintainer
• Condition: maintainer_changed is true AND the new maintainer is globally novel (never seen in the database across any package).

This is C006 (maintainer change) × global novelty - the "local signal weighted by global rarity" composition the accuracy work identified as the missing multiplier. A known maintainer adopting a package is routine (orphan adoptions happen constantly). An unknown maintainer taking over is the account-compromise / hostile-takeover shape. The novelty gate is what turns a noisy signal (all maintainer changes) into a precise one (takeovers by strangers).

Origin: pnpm's trustPolicy: no-downgrade and Socket.dev's maintainer behaviour analysis. pnpm refuses to install a package whose trust evidence has weakened since the previous version; Socket flags packages where a new, never-before-seen maintainer gains publish permissions - the most reliable precursor to a malicious release. H026 composes those two ideas: maintainer change (pnpm's "trust changed") gated by global novelty (Socket's "never seen before"), applied to AUR maintainers instead of npm publishers.

Cold-start gate: On a fresh database every maintainer is globally novel, so H026 fires on 100 % of maintainer-changed packages on first run. It is suppressed until the maintainer table has enough history for "globally novel" to mean something - gated identically to the other novelty signals via maturity() and observation_count.

H063: Epoch Introduced¶

• Severity: MEDIUM (weight 15), INFO for a bare epoch=0
• Category: version
• Condition: A diff introduces epoch= where the previous revision had none.

An epoch overrides normal version comparison, so introducing one forces an upgrade regardless of what the version numbers say. A pre-existing epoch never surfaces in a hunk, so bumping one is quiet.

Fire rate: 0 of 3246.

H037: Long-Stable Property Changed¶

• Severity: MEDIUM (weight 15)
• Category: temporal
• Condition: A tracked property with no more specific rule (license, install_hook_present) changed after a long stable run.

H049: Source Host Changed¶

• Severity: MEDIUM (weight 15)
• Category: source
• Condition: A long-stable source_hosts or source_orgs set changed.

H050: Version Scheme Changed¶

• Severity: INFO (weight 0)
• Category: context
• Condition: The package's version scheme changed (semver to date, and so on). Context only, by design.

H051: Package Description Changed¶

• Severity: MEDIUM (weight 15)
• Category: integrity
• Condition: A long-stable pkgdesc token set changed.

H054: Build System Changed¶

• Severity: MEDIUM (weight 15)
• Category: build
• Condition: Long-stable build_system_markers or build_line_count changed.

H026: Untrusted Maintainer Takeover (corpus path)¶

• Severity: HIGH (weight 25)
• Category: maintainer
• Condition: An ownership transition whose incoming maintainer maintained no package at all in the previous snapshot.

The per-package H026 asks the observation database whether an account has been seen. On the corpus path the snapshot is the better witness: it names the maintainer of every package in the AUR. H026 ships alongside H044 on the same transition, as two findings on two pieces of evidence, so a handover between established packagers carries H044 alone.

H044: Ownership Transition¶

• Severity: MEDIUM (weight 15)
• Category: maintainer
• Condition: A package that existed in the previous snapshot changed to a different, non-empty maintainer.

A move to an empty maintainer is abandonment, which H046 and H060 handle as orphan state rather than as a takeover.

H058: Maintainer Baseline Deviation¶

• Severity: MEDIUM (weight 15)
• Category: maintainer
• Condition: A maintainer's activity this cycle deviates from their own recorded baseline by at least [thresholds] h058.z_score (default 2.0), once h058.min_history_cycles (default 3) cycles of their history exist.

H074: Adopt-then-Modify¶

• Severity: MEDIUM (weight 15)
• Category: maintainer
• Condition: A package adopted this cycle also changed version in the same cycle, within [thresholds] h074.window_days (default 14).

H074 is the exception to the novelty ceiling described in what TrustSight cannot see: it fires on the first package of a campaign, from the maintainer field and commit times alone, before any payload shape exists to recognise. Adoption without a version change is quiet, and so is a change outside the window.

H086: Adopted From Orphan¶

• Severity: MEDIUM (weight 15)
• Category: maintainer
• Condition: The AUR reported this package as orphaned on a previous run, and now reports a maintainer.

This is H074's property on the single-package path. H045, H046, H057, H060 and H074 all describe adoption, and every one of them needs a full-aur cycle: somebody running trustsight review over their installed packages saw none of them, and those are the people the June 2026 campaign hit. H086 needs only the AUR metadata the review path already fetches.

The comparison is against a recorded prior observation. aur_orphaned is tri-state (1 orphaned, 0 maintained, -1 never asked), and H086 requires 1: a database that has never seen this package says nothing, because "no record" is not evidence of adoption. Metadata that was unavailable on a run is recorded as unknown rather than as either state, so a failed RPC cannot manufacture an adoption or erase one.

Adoption is not by itself wrongdoing - packages are adopted honestly every week, which is why this is MEDIUM. Its weight is in the H088 composition.

H088: Adopted, Recipe Rewritten, Unpinned Fetch¶

• Severity: HIGH (weight 25)
• Category: takeover
• Condition: All three of H086 (adopted from orphan), H087 (recipe changed without upstream) and a build-time registry resolution (the unpinned_build_deps coverage gap's trigger) hold for the same diff.

This is the June 2026 campaign's chain in one rule, and it exists because none of its three members can carry the weight alone.

Adoption is ordinary. A recipe-only change is ordinary. npm install inside prepare() is so ordinary that H035 is deliberately scoped away from build functions and a calibration gate keeps it there - the attack worked because its build step looked like every other Node package's. Each part is under the 30 % benign fire-rate ceiling only by being mild.

Together they are not ordinary. A package that was orphaned last week, has a new maintainer this week, whose upstream is byte-identical, and whose build now resolves dependencies from a registry, is describing the attack chain rather than resembling it. Scoring the conjunction is what lets the finding clear the flag threshold without any single member spending fire rate it does not have - the same reasoning H036 and H065 use.

H088 does not replace the unpinned_build_deps coverage gap. The gap fires whenever the build resolves from a registry, whether or not the other two conditions hold, because the analysis genuinely could not see what will run. H088 is a finding about this change; the gap is a statement about what was never examined, and B2 keeps them separate.