CVE Details
| CVE ID |
Severity |
Affected Package |
Installed Version |
Fixed Version |
Date Published |
Date of Scan |
| CVE-2025-66471 |
HIGH |
urllib3 |
1.26.19 |
2.6.0 |
2025-12-05T17:16:04.4Z |
2025-12-06T10:19:10.048869941Z |
Affected Docker Images
| Image Name |
SHA |
public.ecr.aws/lambda/python:latest |
public.ecr.aws/lambda/python@sha256:42fd4356bf50655e7fff84abd2b7da8ac83536e363bb15c360a07f1781198e15 |
public.ecr.aws/lambda/python:3.14 |
public.ecr.aws/lambda/python@sha256:6ac4753bf6baf5a2df0cde8a6f6e9a351742cfdadb7664ca51f68558412bb716 |
public.ecr.aws/lambda/python:3.13 |
public.ecr.aws/lambda/python@sha256:42fd4356bf50655e7fff84abd2b7da8ac83536e363bb15c360a07f1781198e15 |
public.ecr.aws/lambda/python:3.12 |
public.ecr.aws/lambda/python@sha256:418b60ecd5be70360a062d2f369807fe5e2c732e5e8f3d57c6cc0381b51fc89f |
public.ecr.aws/lambda/python:3.11 |
public.ecr.aws/lambda/python@sha256:96c69e2eda46eed5a3da62d44fcba42a38fe4e0c7bc6fd300c5b84800ad98387 |
public.ecr.aws/lambda/python:3.10 |
public.ecr.aws/lambda/python@sha256:6d5b6f61c363cadb295c164ec80cd743a268bd70e0e9d5bb1f4163b0db1e8b16 |
public.ecr.aws/lambda/python:3.9 |
public.ecr.aws/lambda/python@sha256:406c0a7733c40f59855296d97b864d4c09524ba60b4e367a8c98c3d251050f3d |
Description
urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.0 and prior to 2.6.0, the Streaming API improperly handles highly compressed data. urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. When streaming a compressed response, urllib3 can perform decoding or decompression based on the HTTP Content-Encoding header (e.g., gzip, deflate, br, or zstd). The library must read compressed data from the network and decompress it until the requested chunk size is met. Any resulting decompressed data that exceeds the requested amount is held in an internal buffer for the next read operation. The decompression logic could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This can result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data.
Remediation Steps
- Update the affected package
urllib3 from version 1.26.19 to 2.6.0.
About this issue
- This issue may not contain all the information about the CVE nor the images it affects.
- This issue will not be updated with new information and the list of affected images may have changed since the creation of this issue.
- For more, visit Lambda Watchdog.
- This issue was created automatically by Lambda Watchdog.
