CVE-2026-21441 (CNNVD-202601-1138)
中文标题:
urllib3 安全漏洞
英文标题:
urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)
漏洞描述
中文描述:
urllib3是urllib3开源的一款Python HTTP库。该产品具有线程安全连接池、文件发布支持等。 urllib3 2.6.3之前版本存在安全漏洞，该漏洞源于处理HTTP重定向响应时未限制解压缩数据量，可能导致资源消耗过多。
英文描述:
urllib3 is an HTTP client library for Python. 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. urllib3 can perform decoding or decompression based on the HTTP `Content-Encoding` header (e.g., `gzip`, `deflate`, `br`, or `zstd`). When using the streaming API, the library decompresses only the necessary bytes, enabling partial content consumption. Starting in version 1.22 and prior to version 2.6.3, for HTTP redirect responses, the library would read the entire response body to drain the connection and decompress the content unnecessarily. This decompression occurred even before any read methods were called, and configured read limits did not restrict the amount of decompressed data. As a result, there was no safeguard against decompression bombs. A malicious server could exploit this to trigger excessive resource consumption on the client. Applications and libraries are affected when they stream content from untrusted sources by setting `preload_content=False` when they do not disable redirects. Users should upgrade to at least urllib3 v2.6.3, in which the library does not decode content of redirect responses when `preload_content=False`. If upgrading is not immediately possible, disable redirects by setting `redirect=False` for requests to untrusted source.
CWE类型:
标签:
受影响产品
| 厂商 | 产品 | 版本 | 版本范围 | 平台 | CPE |
|---|---|---|---|---|---|
| urllib3 | urllib3 | >= 1.22, < 2.6.3 | - | - |
cpe:2.3:a:urllib3:urllib3:>=_1.22,_<_2.6.3:*:*:*:*:*:*:*
|
| python | urllib3 | * | - | - |
cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:*
|
解决方案
中文解决方案:
英文解决方案:
临时解决方案:
CVSS评分详情
4.0 (cna)
HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
时间信息
利用信息
数据源详情
| 数据源 | 记录ID | 版本 | 提取时间 |
|---|---|---|---|
| CVE | cve_CVE-2026-21441 |
2026-01-09 02:02:07 | 2026-01-12 02:12:36 |
| NVD | nvd_CVE-2026-21441 |
2026-01-09 03:00:09 | 2026-01-12 02:28:16 |
| CNNVD | cnnvd_CNNVD-202601-1138 |
2026-01-11 06:15:08 | 2026-01-12 02:38:12 |
版本与语言
安全公告
变更历史
查看详细变更
- affected_products_count: 1 -> 2
查看详细变更
- vulnerability_type: 未提取 -> 其他
- cnnvd_id: 未提取 -> CNNVD-202601-1138
- data_sources: ['cve', 'nvd'] -> ['cnnvd', 'cve', 'nvd']
查看详细变更
- data_sources: ['cve'] -> ['cve', 'nvd']