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Response snapshot Nov 2, 2026, 16:36 UTC

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VulnerabilityGHSA-v853-p72q-4cfw

Quart leaks raw request body (incl. plaintext passwords) to stdout via stray debug print in Body.__await__

Quart 0.23.0 contains a stray debug statement (print(data)) inside Body.await in quart/wrappers/request.py. Any request whose body is awaited — await request.form, await request.get_data(), WTForms validate_on_submit(), etc.

Published Updated

At a glance

Exploited
Not known
Severity
Not scored yet
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: quart: 0.23.1. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-v853-p72q-4cfw (opens a new tab)

What happened

Summary

Quart 0.23.0 contains a stray debug statement (print(data)) inside Body.await in quart/wrappers/request.py. Any request whose body is awaited — await request.form, await request.get_data(), WTForms validate_on_submit(), etc. — has its raw, unparsed body printed to stdout, including plaintext form fields such as passwords and CSRF tokens. Confirmed present in 0.23.0, confirmed absent in 0.22.0.

Details

In src/quart/wrappers/request.py, Body.await accumulates the request body into a bytearray:

Continue reading

​

data = bytearray()
while not self._queue.empty():
 data.extend(self._queue.get_nowait())
 print(data) # self._max_content_length
 ):
 raise RequestEntityTooLarge()
​

This fires for every request that awaits its body — the overwhelming majority of POST/PUT routes in a typical Quart app (form submissions, JSON APIs via request.get_json(), file uploads, etc.).

PoC

1. pip install quart==0.23.0 (requires Python 3.13+) 2. Minimal route: ​

@app.route("/login", methods=["POST"])
async def login():
 form_data = await request.form
 ...
​

3. Submit a POST with form data, e.g. a login form with staff_id/password fields. 4. Observe stdout: the full raw body is printed as bytearray(b'csrf_token=...&staff_id=...&password=...').

Confirmed via source diff against 0.22.0's request.py, where this line does not exist.

Impact

Any app that captures stdout in logs (terminal redirect, systemd/journald, Docker logs, cloud log aggregation, etc.) will have every submitted form body — including login credentials — written to logs in plaintext. This affects any Quart 0.23.0 app handling authentication or any sensitive form data, and is trivially triggerable by any user simply submitting a form (no attacker action required beyond normal use).

Affected package ranges reported by GitHub: quart: = 0.23.0

Related technology

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Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-v853-p72q-4cfw (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-v853-p72q-4cfw, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, November 2). Quart leaks raw request body (incl. plaintext passwords) to stdout via stray debug print in Body.__await__. https://kevwire.com/record/GHSA-v853-p72q-4cfw

MLA

"Quart leaks raw request body (incl. plaintext passwords) to stdout via stray debug print in Body.__await__." KEVWire, 2 Nov. 2026, kevwire.com/record/GHSA-v853-p72q-4cfw.

Chicago

KEVWire. "Quart leaks raw request body (incl. plaintext passwords) to stdout via stray debug print in Body.__await__." Last modified November 2, 2026. https://kevwire.com/record/GHSA-v853-p72q-4cfw.

Evidence summary (plain text)

Quart leaks raw request body (incl. plaintext passwords) to stdout via stray debug print in Body.__await__ (Oct 5, 2026).
Quart 0.23.0 contains a stray debug statement (print(data)) inside Body.await in quart/wrappers/request.py. Any request whose body is awaited — await request.form, await request.get_data(), WTForms validate_on_submit(), etc. — has its raw, unparsed body printed to stdout, including plaintext form fields such as passwords and CSRF tokens. Confirmed present in 0.23.0, confirmed absent in 0.22.0.
Sources:
GitHub-reviewed advisory GHSA-v853-p72q-4cfw: https://github.com/advisories/GHSA-v853-p72q-4cfw
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: GHSA-v853-p72q-4cfw.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Nov 2, 2026, 16:20 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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