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01 Record

CVE-2018-20406

Modules/_pickle.c in Python before 3.7.1 has an integer overflow via a large LONG_BINPUT value that is mishandled during a "resize to twice the size" attempt. This issue might cause memory exhaustion,

UnratedPUBLISHEDCNA: mitre
CNA base scoreUnratedNo CNA CVSS vector
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02 Description

Modules/_pickle.c in Python before 3.7.1 has an integer overflow via a large LONG_BINPUT value that is mishandled during a "resize to twice the size" attempt. This issue might cause memory exhaustion,

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
5.78% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 92.7% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-10-15.
Red Hat severity
Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2018-12-23 23:00Z7 YR AGO
Last updated
2026-10-15 17:41Z13 DAYS AGO
Reserved
2018-12-23
Assigning CNA
mitre
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-190Integer Overflow or WraparoundBase
Data version
5.2
Document digest
5c2f95569b696801506f8ae584c005611ec5be85fb6acf58b66dd06067de1164

05 Affected products

VendorProductVersionsPlatforms
debiandebian_linuxNot specified—
fedoraprojectfedoraNot specified—
pythonpythonNot specified—
redhatenterprise_linuxNot specified—
redhatrhel_software_collectionsNot specified—

06 References

07 Fixed in

Ubuntu 16.04 LTS

  • python3.5
    Fixed in 3.5.2-2ubuntu0~16.04.8

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • python3.6
    Fixed in 3.6.7-1~18.04

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • python3.4
    Fixed in 3.4.3-1ubuntu1~14.04.7+esm2
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • python3.5
    Fixed in 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.