Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| urllib3 | urllib3 | affected |
|
No data.
OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.
| Vendors | Products |
|---|---|
|
Urllib3
Subscribe
|
Urllib3
Subscribe
|
Project Subscriptions
| Source | ID | Title |
|---|---|---|
 Debian DLA |
DLA-4446-1 | python-urllib3 security update |
 Debian DSA |
DSA-6102-1 | python-urllib3 security update |
| Debian DSA |
DSA-6102-2 | python-urllib3 regression update |
 Github GHSA |
GHSA-38jv-5279-wg99 | Decompression-bomb safeguards bypassed when following HTTP redirects (streaming API) |
 Ubuntu USN |
USN-7955-1 | urllib3 vulnerability |
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Fri, 23 Jan 2026 09:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
Thu, 15 Jan 2026 19:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Python
Python urllib3 |
|
| CPEs | cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Python
Python urllib3 |
|
| Metrics |
cvssV3_1
|
Fri, 09 Jan 2026 00:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
| |
| Metrics |
threat_severity
|
threat_severity
|
Thu, 08 Jan 2026 20:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Thu, 08 Jan 2026 10:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Urllib3
Urllib3 urllib3 |
|
| Vendors & Products |
Urllib3
Urllib3 urllib3 |
Wed, 07 Jan 2026 22:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API) | |
| Weaknesses | CWE-409 | |
| References |
| |
| Metrics |
cvssV4_0
|
Projects
Sign in to view the affected projects.
MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-08-13T12:04:26.343Z
Reserved: 2025-12-29T03:00:29.276Z
Link: CVE-2026-21441
Vulnrichment
Updated: 2026-01-23T09:07:22.785Z
NVD
Status : Modified
Published: 2026-01-07T22:15:44.040
Modified: 2026-08-12T12:17:48.293
Link: CVE-2026-21441
Redhat
OpenCVE Enrichment
Updated: 2026-06-30T16:00:15Z