HTTP Request Smuggling in Waitress: Invalid whitespace characters in headers (Follow-up)
Published Dec 26, 2019 · Updated Oct 23, 2026 · Also known as GHSA-968f-66r5-5v74, PYSEC-2019-138
Original summary
Normalized public record · Updated Oct 23, 2026
HTTP Request Smuggling in Waitress: Invalid whitespace characters in headers (Follow-up)
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
The patches introduced to fix https://github.com/Pylons/waitress/security/advisories/GHSA-m5ff-3wj3-8ph4 were not complete and still would allow an attacker to smuggle requests/split a HTTP request with invalid data.
Potential impact
The patches introduced to fix https://github.com/Pylons/waitress/security/advisories/GHSA-m5ff-3wj3-8ph4 were not complete and still would allow an attacker to smuggle requests/split a HTTP request with invalid data. This updates the existing CVE with ID: CVE-2019-16789
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- MEDIUM
- Confidence
- 10%
- Aliases
- GHSA-968f-66r5-5v74, PYSEC-2019-138
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
- FEDORA-2020-bdcc8ffc24 ↗
- FEDORA-2020-65a7744e38 ↗
- RHSA-2020:0720 ↗
- www.oracle.com ↗
- docs.pylonsproject.org ↗
- Source repository ↗
- Patch commit ↗
- [debian-lts-announce] 20220512 [SECURITY] [DLA 3000-1] waitress security update ↗
Record history
Published Dec 26, 2019 · Last refreshed Oct 23, 2026