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TI-2018-14458 Aliases CVE-2018-20406GHSA-p5h6-p5x2-5qxf

Modules/_pickle.c in Python before 3.7.1 has an integer overflow via a large LONG_BINPUT…

Priority MEDIUM 42CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 7 fixed, 1 without a fix

Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-190 and the CVSS impact.

Summary

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, but is only relevant if the pickle format is used for serializing tens or hundreds of gigabytes of data. This issue is fixed in: v3.4.10, v3.4.10rc1; v3.5.10, v3.5.10rc1, v3.5.7, v3.5.7rc1, v3.5.8, v3.5.8rc1, v3.5.8rc2, v3.5.9; v3.6.10, v3.6.10rc1, v3.6.11, v3.6.11rc1, v3.6.12, v3.6.7, v3.6.7rc1, v3.6.7rc2, v3.6.8, v3.6.8rc1, v3.6.9, v3.6.9rc1; v3.7.1, v3.7.1rc1, v3.7.1rc2, v3.7.2, v3.7.2rc1, v3.7.3, v3.7.3rc1, v3.7.4, v3.7.4rc1, v3.7.4rc2, v3.7.5, v3.7.5rc1, v3.7.6, v3.7.6rc1, v3.7.7, v3.7.7rc1, v3.7.8, v3.7.8rc1, v3.7.9.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.05789 93rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 1 advisoryRed Hat: 7 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*3.4.0 to before 3.7.1Vulnerablepython-pillow
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
cpe:2.3:o:fedoraproject:fedora:28:*:*:*:*:*:*:*28VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*29VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*30VulnerableFedoraproject
  • cpe:2.3:a:python:python:*:*:*:*:*:*:*:* Versions 3.4.0 to before 3.7.1 Vulnerable ·python-pillow
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
  • cpe:2.3:o:fedoraproject:fedora:28:*:*:*:*:*:*:* Versions 28 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:* Versions 29 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* Versions 30 Vulnerable ·Fedoraproject

Remediation

Red Hat 1 advisory

  • RHSA-2019:3725 Released 2019-11-06 · Red Hat rating Moderate
    rh-python36-python security, bug fix, and enhancement update
    • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) rh-python36-python-3.6.9-2.el6, rh-python36-python-debug-3.6.9-2.el6, rh-python36-python-devel-3.6.9-2.el6 +4
    • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-python36-python-3.6.9-2.el7, rh-python36-python-debug-3.6.9-2.el7, rh-python36-python-devel-3.6.9-2.el7 +4
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) rh-python36-python-3.6.9-2.el7, rh-python36-python-debug-3.6.9-2.el7, rh-python36-python-devel-3.6.9-2.el7 +4
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) rh-python36-python-3.6.9-2.el7, rh-python36-python-debug-3.6.9-2.el7, rh-python36-python-devel-3.6.9-2.el7 +4
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-python36-python-3.6.9-2.el7, rh-python36-python-debug-3.6.9-2.el7, rh-python36-python-devel-3.6.9-2.el7 +4
    • Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) rh-python36-python-3.6.9-2.el6, rh-python36-python-debug-3.6.9-2.el6, rh-python36-python-devel-3.6.9-2.el6 +4
    • Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-python36-python-3.6.9-2.el7, rh-python36-python-debug-3.6.9-2.el7, rh-python36-python-devel-3.6.9-2.el7 +4

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Software CollectionsAffectedNo fix yet: Fix deferred
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2019:3725
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2019:3725
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5)Fixed RHSA-2019:3725
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6)Fixed RHSA-2019:3725
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)Fixed RHSA-2019:3725
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2019:3725
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2019:3725
Not affected: 4 products
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-20406
  2. 2026-10-03 Alias added: GHSA-p5h6-p5x2-5qxf
  3. 2026-10-16 CISA SSVC decision points changed

References

Exploit 1

Patch 1

Advisory 11

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences