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CVE-2023-46136

Palletsprojects Werkzeug buffer overflow

8.0 HIGHEPSS 1.07%
  1. Published25 Oct 2023

Description

Werkzeug is a comprehensive WSGI web application library. In versions on the 3.x branch prior to 3.0.1 and on the 2.x branch prior to 2.3.8, if an upload of a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer. This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. This vulnerability has been patched in version 3.0.1 and 2.3.8.

CVSS 3.1 breakdown

Attack vectorAdjacent
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Palletsprojects Werkzeug< 2.3.8 · 3.0.0

Remediation

Fixed in
Palletsprojects Werkzeug≥ 2.3.8

References

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Frequently asked

Is CVE-2023-46136 being actively exploited?

CVE-2023-46136 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.07%.

How severe is CVE-2023-46136?

CVE-2023-46136 has a CVSS 3.1 base score of 8.0, rated high. EPSS estimates a 1.07% probability of exploitation.

Which products are affected by CVE-2023-46136?

Affected products include Palletsprojects Werkzeug.

How do I fix CVE-2023-46136?

Upgrade affected software to a fixed version, for example Palletsprojects Werkzeug 2.3.8 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-46136 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.