CVE-2026-84366Public exploitNetwork attack vectorHinoki check available

Credential disclosure and data poisoning via plaintext S3

Published Sep 1, 2026 · Updated Sep 2, 2026

Cleartext transmission in Scrapy before 2.17.0 allows man-in-the-middle attackers to read or alter signed S3 traffic. S3DownloadHandler rewrites an s3:// bucket and key as an HTTP endpoint unless is_secure is explicitly enabled, then signs and sends the request with AWS credentials. Use of s3:// requests with configured AWS credentials is required; exposure includes authorization material and object data, while response tampering can poison crawl output.

CVSS severity7.4
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Cleartext transmission in Scrapy before 2.17.0 allows man-in-the-middle attackers to read or alter signed S3 traffic. S3DownloadHandler rewrites an s3:// bucket and key as an HTTP endpoint unless is_secure is explicitly enabled, then signs and sends the request with AWS credentials. Use of s3:// requests with configured AWS credentials is required; exposure includes authorization material and object data, while response tampering can poison crawl output.

The record

CVE
CVE-2026-84366
Published
Sep 1, 2026
Updated
Sep 2, 2026
Vendor
Scrapy
Product
Scrapy
Classifications
CWE-319, T1040, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.17.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Scrapy · Scrapyversion=< 2.17.0

Published CVSS scores

7.4GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
T1040Network Sniffing
T1557Adversary-in-the-Middle

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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