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Nova pins vulnerable cowlib 2.16.1 via cowboy override (GHSA-g2wm-735q-3f56) #395

Description

@Taure

nova's rebar.config carries:

{overrides, [{override, cowboy, [{deps, [{cowlib, "2.16.1"}, {ranch, "2.2.0"}]}]}]}.

cowlib 2.16.1 has advisory GHSA-g2wm-735q-3f56 (cookie request-header injection via cow_cookie:cookie/1). Because this is an override, downstream apps can only clear the advisory by adding their own top-level {cowlib, "~> 2.17"} (which supersedes the override) - bumping nova does not help.

Suggest bumping the override to a fixed cowlib (2.17.1+/2.18.0) once verified compatible with the pinned cowboy 2.15.0, so downstream apps inherit the fix. Low severity (advisory itself is low), but it means every Nova app currently ships a flagged transitive dep.

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