Code scanning (js/polynomial-redos, alerts #16 and #17)
-------------------------------------------------------
bowser applies these regexps to attacker-controlled User-Agent strings, and
four of them ran in quadratic time:
* The "Something else" fallback used /^(.*)\/(.*) / and
/^(.*)\/(.*)[ \t]\((.*)/. Two unbounded `.*` before a required literal
make the split ambiguous, so a UA of "/a" repeated backtracks O(n^2).
Greedy `(.*)` always picks the last `/` that still has the delimiter
after it, so the second group can never span a `/` -- narrowing it to
`[^/]*` is exactly equivalent and removes the ambiguity. Verified
identical on 1,000,000 fuzzed inputs and on the full acceptance corpus.
* The Linespider and SlackBot version regexps used `(?:-[-\w]+)?` before a
required `[\s/]`. Since `[-\w]` and `[\s/]` are disjoint the backtracking
is pure waste, but the engine still walks it once per start position, so
"linespider-" repeated is quadratic. Bounding the run to `{1,64}` makes
it linear; no real bot-name suffix approaches 64 characters.
A sweep of all 253 regexp literals in src/ (fuzzed for superlinear scaling,
with the four pre-fix patterns used to confirm the detector works) reports no
remaining superlinear regexps. test/unit/redos.js locks this in.
Actions (actions/missing-workflow-permissions, alerts #5 and #15)
-----------------------------------------------------------------
merge-to-master.yml and draft-or-update-next-release.yml had no `permissions`
block and so inherited the default token. Both now declare least privilege,
matching publish.yml and pull-request.yml.
Dependabot (22 open alerts, all development scope)
--------------------------------------------------
bowser ships no runtime dependencies, so none of these reached consumers, but
they were live in CI. `pnpm audit` goes from 29 advisories to 0:
* jsdoc 3 -> 4 (with docdash 1 -> 2) drops taffydb, which has no patched
release, and picks up current markdown-it/linkify-it.
* coveralls -> coveralls-next 6 drops `request`, which is deprecated with no
patched release, along with form-data, qs 6.5.x, uuid 3 and tough-cookie 2.
Same `coveralls` bin and same stdin contract; lcov conversion verified.
* gh-pages 3 -> 6 clears the critical prototype pollution advisory.
* pnpm overrides pin the remaining transitive-only advisories to the lowest
patched release on each existing major.
Verified: pnpm audit clean, lint clean, 346 tests pass (the acceptance corpus
runs against both src/ and the built es5.js), build, package smoke test, and
doc generation.
