On 10/22/26 5:07 PM, Valtteri Vuorikoski wrote: Having spent the day whacking this particular molehill, my strong opinion is that these packages (minus certifi) should stop vendoring roots immediately.

Users should install their distro's ca-certificates package or similar. If that is completely impossible for whatever reason, offer an option to use certifi (which should be a dependency, not vendored) - but the system trust store should be the default source of truth.

This sort of easter egg hiding to serve users with broken installations reduces the security of everyone else.

(Missing from the quoted list: botocore also includes a vendored copy. I haven't checked how it's used.) This is why using packages from a Linux distro is good: linux distro provided "certifi" packages typically are patched or outright build from https://github.com/projg2/certifi-system-store, to use, well, the system store.

And pip is unbundled to use the system certifi. Well ok, technically it is unbundled to use the system requests, and the system requests uses the system certifi.

sigstore's "update" was updating a lockfile to lock newer certifi, they didn't even actually add a >= dependency on "new enough to have the eMudhra fix" so the whole thing is actually ludicrous. If you had sigstore installed before a couple days ago, upgrading sigstore won't upgrade your certs, and if you actually updated all packages then certifi would be updated regardless of whether sigstore tagged a new version.

conda actually responded by adding a dependency constraint to >= the suitable version of certifi.

uv / pixi are rust software, which means a) infinite vendoring, b) cargo build will usually error out if you try to patch anything to unvendor it, so, "good luck" (and also stick to pip IMO).

...

This is why vendoring is always fundamentally treated with such suspicion. We have had ample proof over the decades that issues like this will just continue to crop up again and again, in so many various ways, despite what the

"AcKshUAlLY sTaTIc LinkING iS MORE efFiCIEnt"

crowd says.

Python vendored packages is just static linking with the additional possibility of trivial monkeypatching.

-- Eli Schwartz