Is CVE-2023-46136 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2023-46136 being exploited in the wild.

How severe is CVE-2023-46136?

Medium severity, with a CVSS score of 5.7, published 25 October 2023.

Which products and versions are affected?

werkzeug (PyPI) ECOSYSTEM:introduced=3.0.0,fixed=3.0.1, GIT:introduced=0,fixed=f3c803b3ade485a45f12b6d6617595350c0f03e2,fixed=f2300208d5e2a5076cbbb4c2aad71096fd040ef9|ECOSYSTEM:introduced=0,fixed=2.3.8,introduced=3.0.0,fixed=3.0.1.

Is there a fix for CVE-2023-46136?

Yes. werkzeug (PyPI): upgrade to 3.0.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2023-46136 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2023-46136?

Check whether you run werkzeug (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2023-46136: Pallets Werkzeug denial of service in multipart parser

CVE-2023-46136 · Severity: medium · CVSS 5.7 · Published 2023-10-25

Werkzeug is a widely used library for building web applications in Python. A flaw in how it handles file uploads allows an attacker to send a specially crafted request that consumes excessive CPU and memory. This can slow down or completely crash the web server, preventing legitimate users from accessing the service.

Technologies: werkzeug (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2023-46136 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2023-46136 being exploited in the wild.
How severe is CVE-2023-46136?: Medium severity, with a CVSS score of 5.7, published 25 October 2023.
Which products and versions are affected?: werkzeug (PyPI) ECOSYSTEM:introduced=3.0.0,fixed=3.0.1, GIT:introduced=0,fixed=f3c803b3ade485a45f12b6d6617595350c0f03e2,fixed=f2300208d5e2a5076cbbb4c2aad71096fd040ef9|ECOSYSTEM:introduced=0,fixed=2.3.8,introduced=3.0.0,fixed=3.0.1.
Is there a fix for CVE-2023-46136?: Yes. werkzeug (PyPI): upgrade to 3.0.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2023-46136 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2023-46136?: Check whether you run werkzeug (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

werkzeug (PyPI): upgrade to 3.0.1 or later
```
pip install "werkzeug>=3.0.1"
```

Technical details

A denial of service vulnerability exists in the Werkzeug multipart/form-data parser due to inefficient buffer management. When a multipart part begins with a carriage return (CR) or line feed (LF) character followed by a large amount of data without those characters, the parser inefficiently appends chunks to an internal bytearray. This results in quadratic-time complexity for boundary lookups on a growing buffer. An attacker can exploit this by sending crafted multipart data to any endpoint that parses such input, leading to high CPU usage and potential Out-of-Memory (OOM) kills. The issue is fixed in versions 3.0.1 and 2.3.8.

Affected products

Pallets Werkzeug >= 3.0.0, < 3.0.1; >= 2.0.0rc1, < 2.3.8

Identifiers

CVE-2023-46136
GHSA-hrfv-mqp8-q5rw
PYSEC-2023-221

Timeline

2023-10-24: patched: Fixes released in versions 3.0.1 and 2.3.8
2023-10-25: disclosed: GitHub Advisory published

References

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