CVE-2012-1150

CVE-2012-1150 is a medium-severity vulnerability in Python with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-310.

Key facts

• Severity: Medium (CVSS 2.0 base score 5.0)
• EPSS exploit prediction: 5% (91st percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-310
• Affected product: Python
• Published: 2012-10-05
• Last modified: 2026-06-16

Description

Python before 2.6.8, 2.7.x before 2.7.3, 3.x before 3.1.5, and 3.2.x before 3.2.3 computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table.

Frequently asked questions

What is CVE-2012-1150?

Python before 2.6.8, 2.7.x before 2.7.3, 3.x before 3.1.5, and 3.2.x before 3.2.3 computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table.

How severe is CVE-2012-1150?

CVE-2012-1150 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2012-1150 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-1150?

CVE-2012-1150 primarily affects Python. In total, 58 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-1150?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2012-1150 published?

CVE-2012-1150 was published on 2012-10-05 and last updated on 2026-06-16.

References

• http://bugs.python.org/issue13703
• http://lists.apple.com/archives/security-announce/2013/Oct/msg00004.html
• http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
• http://mail.python.org/pipermail/python-dev/2011-December/115116.html
• http://mail.python.org/pipermail/python-dev/2012-January/115892.html
• http://python.org/download/releases/2.6.8/
• http://python.org/download/releases/2.7.3/
• http://python.org/download/releases/3.1.5/
• http://python.org/download/releases/3.2.3/
• http://secunia.com/advisories/50858
• http://secunia.com/advisories/51087
• http://secunia.com/advisories/51089
• http://www.openwall.com/lists/oss-security/2012/03/10/3
• http://www.ubuntu.com/usn/USN-1592-1
• http://www.ubuntu.com/usn/USN-1596-1
• http://www.ubuntu.com/usn/USN-1615-1
• http://www.ubuntu.com/usn/USN-1616-1
• https://bugzilla.redhat.com/show_bug.cgi?id=750555

Affected products (58)

• cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:0.9.0:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:0.9.1:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:1.2:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:1.3:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:1.5.2:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:1.6:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:1.6.1:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.0:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.1:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.1.2:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.1.3:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.2:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.2.2:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.2.3:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.3.1:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.3.2:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.3.3:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.3.4:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.3.5:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.3.7:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.4.1:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.4.2:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.4.3:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.4.4:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.4.6:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.5.1:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.5.2:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.5.3:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.5.4:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.5.6:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.5.150:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.6.1:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.6.2:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.6.3:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.6.4:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:2.6.5:*:*:*:*:*:*:*

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• CVE-2013-0137 — Critical (CVSS 10.0): The default configuration of the Digital Alert Systems DASDEC EAS device before 2.0-2 and the Monroe Electronics R189…
• CVE-2011-5123 — Critical (CVSS 10.0): The Antivirus component in Comodo Internet Security before 5.3.175888.1227 does not check whether X.509 certificates in…

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Threat intelligence

Threat-intel indicators referencing this CVE:

• 121.164.135.251 (ipv4-addr)