KofTwentyTwo/nuncio
2
0 Fork 0
Code Issues 73 Pull Requests 12 Actions Packages Projects Releases Wiki Activity

WS-D5 Bounded/paged IMAP fetch with per-message + per-batch size caps (use RFC822.SIZE) #301

New Issue
Closed
opened 2026-07-31 18:14:31 +00:00 by KofTwentyTwo · 1 comment
KofTwentyTwo commented 2026-07-31 18:14:31 +00:00 (Migrated from github.com)
Copy link
Copy source

Malicious/huge server can OOM the daemon (1:* full-body into an in-memory Vec; RFC822.SIZE fetched but unused). Coordinate with WS-A pagination + WS-C dispatcher. Size M.

Roadmap-to-9/10 (design: scratchpad/design/). Serial PROTO queue via WS-A. Brief at dispatch. DoD per docs/STORY-WORKFLOW.md.

Malicious/huge server can OOM the daemon (1:* full-body into an in-memory Vec; RFC822.SIZE fetched but unused). Coordinate with WS-A pagination + WS-C dispatcher. Size M. Roadmap-to-9/10 (design: scratchpad/design/). Serial PROTO queue via WS-A. Brief at dispatch. DoD per docs/STORY-WORKFLOW.md.
KofTwentyTwo commented 2026-07-31 21:54:40 +00:00 (Migrated from github.com)
Copy link
Copy source

Delivered via PR #352 (WS-D5, squash-merged to dev). Two-phase bounded IMAP fetch: enumerate UID+RFC822.SIZE (no body), then pull full bodies in bounded UID-set batches of MAX_MESSAGES_PER_FETCH_BATCH=200 (never an unbounded 1:* body fetch); a message over MAX_MESSAGE_BODY_BYTES=25MiB is fetched headers-only with an empty body + WARN (never buffered whole, never fabricated/dropped). Closes the acute malicious-server OOM vectors. Incremental checkpointing + fire-once preserved (tested). Honest residual: aggregate return is still O(mailbox) — streaming-return is a separate future story.

Delivered via PR #352 (WS-D5, squash-merged to dev). Two-phase bounded IMAP fetch: enumerate UID+RFC822.SIZE (no body), then pull full bodies in bounded UID-set batches of MAX_MESSAGES_PER_FETCH_BATCH=200 (never an unbounded 1:* body fetch); a message over MAX_MESSAGE_BODY_BYTES=25MiB is fetched headers-only with an empty body + WARN (never buffered whole, never fabricated/dropped). Closes the acute malicious-server OOM vectors. Incremental checkpointing + fire-once preserved (tested). Honest residual: aggregate return is still O(mailbox) — streaming-return is a separate future story.
Sign in to join this conversation.
No Branch/Tag Specified
Labels
Clear labels
area-ci
CI / quality gates
 area-cli
nuncio-cli reference client
 area-docs
Documentation
 area-grpc
gRPC API layer
 area-mail
Mail protocols
 area-release
Release / packaging
 area-security
Security
 area-store
Storage / SQLite
 bug
Something isn't working
 deferred
Backlog, off the critical path; re-justify before scheduling
 dependencies
Pull requests that update a dependency file
 documentation
Improvements or additions to documentation
 duplicate
This issue or pull request already exists
 enhancement
New feature or request
 github_actions
Pull requests that update GitHub Actions code
 good first issue
Good for newcomers
 help wanted
Extra attention is needed
 invalid
This doesn't seem right
 javascript
Pull requests that update javascript code
 phase-0
Roadmap Phase 0
 phase-1
Roadmap Phase 1
 phase-2
Roadmap Phase 2
 phase-3
Roadmap Phase 3
 phase-4
Roadmap Phase 4
 phase-5
Roadmap Phase 5
 question
Further information is requested
 rust
Pull requests that update rust code
 story
Roadmap story: full LLM-ready spec, done via engine+proto+CLI+E2E
 wontfix
This will not be worked on
No labels story
Milestone
No items
No Milestone WS-D: Security to 9/10
Projects
Clear projects
No projects
Assignees
Clear assignees
forge-recovery (Forge Recovery) james.maes (James Maes)
No Assignees
1 Participants
Notifications
Due Date
No due date set.
Dependencies

No dependencies set.

Reference: KofTwentyTwo/nuncio#301