CVE-2024-49768
Description
Waitress is a Web Server Gateway Interface server for Python 2 and 3. A remote client may send a request that is exactly recv_bytes (defaults to 8192) long, followed by a secondary request using HTTP pipelining. When request lookahead is disabled (default) we won't read any more requests, and when the first request fails due to a parsing error, we simply close the connection. However when request lookahead is enabled, it is possible to process and receive the first request, start sending the error message back to the client while we read the next request and queue it. This will allow the secondary request to be serviced by the worker thread while the connection should be closed. Waitress 3.0.1 fixes the race condition. As a workaround, disable channel_request_lookahead, this is set to 0 by default disabling this feature.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 2.1.2-2+deb12u1 |
| debian | bullseye | fixed | 0 |
| debian | forky | fixed | 3.0.1-1 |
| debian | sid | fixed | 3.0.1-1 |
| debian | trixie | fixed | 3.0.1-1 |
References
- https://github.com/Pylons/waitress/security/advisories/GHSA-9298-4cf8-g4wj
- https://nvd.nist.gov/vuln/detail/CVE-2024-49768
- https://github.com/Pylons/waitress/commit/e4359018537af376cf24bd13616d861e2fb76f65
- https://github.com/Pylons/waitress
- https://github.com/pypa/advisory-database/tree/main/vulns/waitress/PYSEC-2024-210.yaml
- https://www.suse.com/security/cve/CVE-2024-49768.html
- https://security-tracker.debian.org/tracker/CVE-2024-49768
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.