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Size is not a defect on its own — some problems genuinely live in one place — but these are where merge conflicts, review fatigue and single-owner knowledge concentrate, and they are the first thing that slows an inheriting engineer down.","context_why":"A note that does not affect this rating: notes like it are common in well-run projects."}],"signals_run":11,"conclusive_signals":8,"what_a_person_adds":[{"id":"01.38","kind":"H+","where":"The team","measured":"No architecture or design document is in the tree, across 4,548 product files.","question":"Where does the design live, and who holds it?"},{"id":"01.39","kind":"H","where":"Your architects, with the product roadmap","question":"Is the architecture right for the next three years of the product?"},{"id":"01.40","kind":"H","where":"The team's reasoning at the time","question":"Were the home-grown components reasonable choices when they were made, and are they now?"}]},{"id":"02","band":"adequate","name":"Engineering Process & SDLC Maturity","coverage":"high","findings":[{"id":"02.1","band":"adequate","layer":"deterministic","title":"Little of the recent change carries a trace of review","signal":"merge_discipline","weight":"corroborating","evidence":[{"ref":"reviewable-arrivals","kind":"metric","detail":"201 of 7,640 commits in the last 24 months carry review evidence; 2.0% across all 23,504"}],"observed":{"merges":28,"window":"last 24 months","with_tracked":25,"with_reviewed":0,"reviewed_share":0.026,"commits_in_window":7640,"squashed_with_pr_ref":70,"with_signed_off_other":6,"reviewed_share_all_time":0.02,"with_committed_by_other":92},"dimension":"02","rationale":"In the last 24 months, 201 of 7,640 commits (2.6%) carry any trace of review: a merge, a pull-request reference, a Reviewed-by or Reviewed-on trailer, a Closes/Fixes reference, a maintainer's sign-off on someone else's change, or a change applied by someone other than its author. That is low but not absent. Review may happen in a workflow this history does not record; a buyer should ask how change is approved before it ships."}],"signals_run":16,"conclusive_signals":14,"what_a_person_adds":[{"id":"02.32","kind":"H","where":"The code host's pull request data","question":"Is review real or a rubber stamp? 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The history shows the gap, not why it happened."},{"id":"03.28","kind":"H","where":"The team; review history only suggests candidates","question":"Who mentors whom, and would that survive a departure?"},{"id":"03.30","kind":"H","where":"Recruiting data and the org chart","question":"Can the team grow, and who stands behind the top three contributors?"},{"id":"03.31","kind":"H","where":"HR data","question":"Is the seniority mix sound, and will pay survive your salary bands?"},{"id":"03.14","kind":"H","where":"Interviews and on-call history","question":"Is the pace sustainable? 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The shipped product may differ from what this report describes. Survey the release branch too.","context_why":"A note that does not affect this rating: notes like it are common in well-run projects."}],"signals_run":19,"conclusive_signals":11,"what_a_person_adds":[{"id":"04.11","kind":"H+","where":"The team","measured":"7,411 commits landed in the last year, against 194 the year before (+3720%).","question":"What drove it: new people, a deadline, or code produced faster than before?"},{"id":"04.32","kind":"H","where":"The data room and the team's record of estimates","question":"Can this team deliver the stated roadmap on the stated timeline?"},{"id":"04.31","kind":"H","where":"Budget and roadmap decisions","question":"Does leadership know about the debt, and is time budgeted to repay it?"},{"id":"04.33","kind":"H","where":"Revenue, customer and churn data","question":"Is the engineering shape consistent with the commercial story?"}]},{"id":"05","band":"strong","name":"Security & Reliability Posture","coverage":"partial","findings":[{"id":"05.3","band":"adequate","layer":"deterministic","title":"12 dependencies float, and no lockfile is committed","signal":"dependency_pinning","weight":"corroborating","context":true,"evidence":[{"ref":"unpinned","kind":"path","path":"cmd/package.json","detail":"^1.3.10","line_end":null,"verbatim":true,"line_start":3},{"ref":"unpinned","kind":"path","path":"cmd/package.json","detail":"^25.5.0","line_end":null,"verbatim":true,"line_start":4},{"ref":"unpinned","kind":"path","path":"cmd/package.json","detail":"^8.0.7","line_end":null,"verbatim":true,"line_start":5},{"ref":"unpinned","kind":"path","path":"ext/mupdf/docs/requirements.txt","detail":"any version","line_end":null,"verbatim":true,"line_start":1},{"ref":"unpinned","kind":"path","path":"ext/mupdf/docs/requirements.txt","detail":"any version","line_end":null,"verbatim":true,"line_start":2}],"observed":{},"dimension":"05","rationale":"Dependency versions are declared as ranges and no lockfile is committed, so a build today does not necessarily produce what a build last month produced. That matters twice over in a transaction: the thing being bought cannot be reproduced exactly, and a compromised upstream release arrives without anyone choosing to take it.","context_why":"A note that does not affect this rating: in Borehole's calibration, this check's notes were usually true but overstated."},{"id":"05.21","band":"adequate","layer":"deterministic","title":"3 shell commands built from strings","signal":"shell_from_strings","weight":"corroborating","context":true,"evidence":[{"ref":"ext/mupdf/setup.py","kind":"path","path":"ext/mupdf/setup.py","detail":"command run through a shell","line_end":191,"line_start":191},{"ref":"ext/mupdf/setup.py","kind":"path","path":"ext/mupdf/setup.py","detail":"command run through a shell","line_end":279,"line_start":279},{"ref":"ext/mupdf/setup.py","kind":"path","path":"ext/mupdf/setup.py","detail":"command run through a shell","line_end":335,"line_start":335}],"observed":{"sites":3},"dimension":"05","rationale":"3 places run a command through a shell (`shell=True`, `os.system`, `exec` with a template) rather than passing arguments. Where any part comes from outside, it is command injection. Ask where each one's input comes from.","context_why":"A note that does not affect this rating: in Borehole's calibration, this check's notes were usually true but overstated."},{"id":"05.60","band":"adequate","layer":"deterministic","title":"Relicensed: GPL-2.0 → GPL-3.0 (2009-07-03)","signal":"licence_changes","weight":"corroborating","context":true,"evidence":[{"ref":"db15b5b87","kind":"commit","path":"COPYING","detail":"GPL-2.0 from 2007-07-23"},{"ref":"04d7b0dcf","kind":"commit","path":"COPYING","detail":"GPL-3.0 from 2009-07-03"}],"observed":{"since":"2009-07-03","latest":"GPL-3.0","weaker":false,"narrowed_at":null,"narrowed_days":null,"licence_versions":2,"source_available":false,"narrowed_recently":false,"unreleased_changes":0},"dimension":"05","rationale":"The root licence changed 1 time(s). Code taken under earlier terms stays under them; check which terms any fork or customer relied on.","context_why":"A note that does not affect this rating: a licence change is a fact for the first screen, and only a narrowing of rights within two years of the surveyed commit costs \"strong\"."},{"id":"05.65","band":"adequate","layer":"deterministic","title":"24 advisories against this project in the last 24 months, 11 high or critical","signal":"advisory_record","weight":"corroborating","context":true,"evidence":[{"ref":"GHSA-5wm7-225j-9qcj","kind":"advisory","detail":"2026-10-27: GHSA-5wm7-225j-9qcj (high): SumatraPDF: Unauthenticated WM_COPYDATA/DDE CmdExec Channel Allows Arbitrary Local Program Execution and Restricted-Mode Policy Bypass"},{"ref":"GHSA-m2fg-gc9h-qv9c","kind":"advisory","detail":"2026-10-26: GHSA-m2fg-gc9h-qv9c (high), fixed in djvudec 5925e18 (github.com/kjk/djvudec): Heap buffer overflow in bundled DjVu decoder (djvudec) via integer overflow of JB2 bitmap dimensions"},{"ref":"CVE-2026-88361","kind":"advisory","detail":"2026-09-24: CVE-2026-88361 (high): SumatraPDF 3.6.1 contains an integer overflow vulnerability in EngineMupdf::BuildPageLabelRec() when parsing PDF PageLabels /Nums entries."},{"ref":"GHSA-86hq-m6hv-67h2","kind":"advisory","detail":"2026-09-16: GHSA-86hq-m6hv-67h2 (moderate): Unsigned-to-signed hdrLen validation bypass in SumatraPDF MOBI parsing causes out-of-bounds read"},{"ref":"GHSA-vfpj-qhvj-92wg","kind":"advisory","detail":"2026-09-16: GHSA-vfpj-qhvj-92wg (moderate): Signed integer overflow in SumatraPDF LIT header parsing causes invalid-pointer read"}],"observed":{"newest":"2026-10-27","critical":0,"affecting":0,"could_not_tell":8,"fix_unreleased":0,"last_24_months":24,"sources_failed":[],"known_exploited":0,"high_or_critical":11,"record_incomplete":["NVD: 7 records name sumatrapdf with nothing tying them to this repository (CVE-2009-1605, CVE-2009-4117, CVE-2012-4895, …)"],"affecting_newest_release_only":4},"dimension":"05","rationale":"The newest was published on 2026-10-27. A project that publishes advisories is telling its users about its fixes, and the count and pace say how much security work it carries. Whether 8 of them are fixed in the code you ship could not be told from this history: its version is only known to be at least 3.2.0. Answer lives in: the release you run, set against each fixed version. GHSA-27p6-wrfp-pgm8 (moderate), GHSA-jf4v-rw66-j4w2 (high), GHSA-5mwx-65x7-cffp (moderate) and 1 more are fixed in the surveyed commit; which release carries them cannot be told from this history, which does not place the release users run. Answer lives in: the version you run. The record is incomplete: NVD: 7 records name sumatrapdf with nothing tying them to this repository (CVE-2009-1605, CVE-2009-4117, CVE-2012-4895, …).","context_why":"A note that does not affect this rating: it describes the project's advisory record, and no advisory in it is known to affect the surveyed commit."}],"signals_run":34,"conclusive_signals":17,"what_a_person_adds":[{"id":"05.41","kind":"H","where":"Ticketing and chat","question":"What has actually broken, how often, and how badly?"},{"id":"05.42","kind":"H","where":"Reports in the data room","question":"What did external testing find, and was it fixed?"},{"id":"05.44","kind":"H","where":"Audit reports; policy files in the tree are not evidence","question":"What is the SOC 2, ISO 27001 or GDPR status, and where is the evidence?"}]},{"id":"06","band":"not assessable","name":"Observability & Operations","coverage":"partial","findings":[],"signals_run":16,"conclusive_signals":4,"what_a_person_adds":[{"id":"06.29","kind":"H","where":"Pager history and dashboard logs","question":"Are the dashboards opened, the alerts acknowledged and the pages answered?"},{"id":"06.30","kind":"H","where":"Production metrics","question":"Are the service-level objectives actually met?"},{"id":"06.31","kind":"H","where":"Pager exports and interviews","question":"Who carries the pager, and how often does it go off?"},{"id":"06.32","kind":"H","where":"Cloud billing and capacity plans","question":"What does it cost to run, and how much headroom is there?"}],"not_assessable_reason":"only 4 of 16 checks could reach a conclusion here; the rest do not apply to this repository or could not read it"},{"id":"07","band":"not assessable","name":"Fit with the Acquirer","coverage":"none","findings":[],"signals_run":0,"conclusive_signals":0,"what_a_person_adds":[{"id":"07.1","kind":"H+","question":"This is primarily a C codebase, with C++ alongside (21% of source files). Does your engineering organisation already run C in production, or would this be the first?"},{"id":"07.10","kind":"H+","question":"The bulk of this system sits in ext/, src/, vs2022/. Which of your existing systems would each of those have to absorb or replace?"},{"id":"07.9","kind":"H+","question":"54% of lines added in the last 12 months (22% of added lines) came through AI-declared commits. Does your organisation have a policy on inheriting and maintaining that code, and does your engineering team's tooling match how it was produced?"},{"id":"07.2","kind":"H+","question":"Nothing in the repository says how this is deployed. Is it shipped as a library, a binary or a service, and if it runs somewhere, who owns that environment?"},{"id":null,"kind":"H+","question":"What is your tolerance for the findings above remaining unaddressed for the first two quarters after close, given everything else that will compete for this team's time?"},{"id":"07.11","kind":"H","where":"Your architecture","question":"Which of these systems duplicate yours, and which get retired?"},{"id":"07.12","kind":"H","where":"The engagement","question":"What will integration cost, and in what order?"},{"id":"07.13","kind":"H","where":"Your org design","question":"Where does the team land in your organisation, and who reports to whom?"},{"id":"07.14","kind":"H","where":"Deal terms","question":"Are there earn-outs, retention packages or contractor IP to assign?"},{"id":"07.15","kind":"H","where":"Customer contracts","question":"Do customer contracts limit hosting, regions or vendors?"}],"not_assessable_reason":"structurally not assessable 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