Cleartext transmission of sensitive information in scrapy - CVE-2026-84366
Published: July 7, 2026 / Updated: September 2, 2026
Vulnerability identifier: #VU137025
CSH Severity: Medium
CVSS v4: 9.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-84366
CWE-ID: CWE-319
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information and modify transmitted data.
The vulnerability exists due to cleartext transmission of sensitive information in the S3DownloadHandler when sending signed s3 requests over plaintext http by default. A remote attacker can observe or tamper with network traffic to disclose sensitive information and modify transmitted data.
Only requests made with AWS credentials are affected, and temporary credentials may expose the X-Amz-Security-Token.
Affected software
scrapy
How to mitigate CVE-2026-84366
Install security update from vendor's website.
scrapy - update to 2.17.0