CVE-2019-16786 (GCVE-0-2019-16786)

Vulnerability from cvelistv5 – Published: 2019-12-20 23:00 – Updated: 2024-08-05 01:24
VLAI
Title
HTTP Request Smuggling: Invalid Transfer-Encoding in Waitress
Summary
Waitress through version 1.3.1 would parse the Transfer-Encoding header and only look for a single string value, if that value was not chunked it would fall through and use the Content-Length header instead. According to the HTTP standard Transfer-Encoding should be a comma separated list, with the inner-most encoding first, followed by any further transfer codings, ending with chunked. Requests sent with: "Transfer-Encoding: gzip, chunked" would incorrectly get ignored, and the request would use a Content-Length header instead to determine the body size of the HTTP message. This could allow for Waitress to treat a single request as multiple requests in the case of HTTP pipelining. This issue is fixed in Waitress 1.4.0.
Severity
7.1 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7886 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Pylons Waitress Affected: <= 1.3.1 , ≤ 1.3.1 (custom)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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        "lastModified": "2024-11-21T04:31:11.360",
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        "published": "2019-12-20T23:15:11.277",
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            "tags": [
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    "redhat_vex": {
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      "current_release_date": "2026-11-01T04:35:13+00:00",
      "cve": "CVE-2019-16786",
      "id": "CVE-2019-16786",
      "initial_release_date": "2019-12-20T00:00:00+00:00",
      "product_status:fixed": "13",
      "product_status:known_affected": "7",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "waitress: HTTP request smuggling through invalid Transfer-Encoding",
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      "version": "3"
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      "current_release_date": "2026-09-01T01:47:56Z",
      "cve": "CVE-2019-16786",
      "id": "CVE-2019-16786",
      "initial_release_date": "2023-02-15T04:07:54Z",
      "product_status:known_affected": "14",
      "product_status:recommended": "577",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2019-16786",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2019-16786.json",
      "version": "19"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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    Related by attack behaviour

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