python: hash table collisions CPU usage DoS (oCERT-2011-003)
Published Oct 5, 2012
5.0
MEDIUMCVSS 2.0
EPSS 5.06%
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.
Affected products
No data.
Configuration 1
- ≤ 2.6.7
- 0.9.0
- 0.9.1
- 1.2
- 1.3
- 1.5.2
- 1.6
- 1.6.1
- 2.0
- 2.0.1
- 2.1
- 2.1.1
- 2.1.2
- 2.1.3
- 2.2
- 2.2.1
- 2.2.2
- 2.2.3
- 2.3.1
- 2.3.2
- 2.3.3
- 2.3.4
- 2.3.5
- 2.3.7
- 2.4.1
- 2.4.2
- 2.4.3
- 2.4.4
- 2.4.6
- 2.5.1
- 2.5.2
- 2.5.3
- 2.5.4
- 2.5.6
- 2.5.150
- 2.6.1
- 2.6.2
- 2.6.3
- 2.6.4
- 2.6.5
- 2.6.6
- 2.6.2150
- 2.6.6150
Configuration 2
Configuration 3
No data.
Red Hat Enterprise Linux 5
python-0:2.4.3-46.el5_8.2
Fixed · RHSA-2012:0745
Red Hat Enterprise Linux 6
python-0:2.6.6-29.el6_2.2
Fixed · RHSA-2012:0744
Red Hat Enterprise Linux 4
python
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | python-0:2.4.3-46.el5_8.2 | Fixed | RHSA-2012:0745 |
| Red Hat Enterprise Linux 6 | python-0:2.6.6-29.el6_2.2 | Fixed | RHSA-2012:0744 |
| Red Hat Enterprise Linux 4 | python | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 5.06% (0.05060) | 92.05th | v5 (v2026.06.15) |
| Jun 15, 2026 | 5.06% (0.05060) | 91.19th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.49% (0.01489) | 79.31th | v4 (v2025.03.14) |
| Mar 29, 2025 | 3.94% (0.03942) | 80.27th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.68% (0.01683) | 80.94th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.71% (0.00715) | 81.17th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.71% (0.00715) | 79.90th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.71% (0.00715) | 77.46th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.69% (0.02686) | 82.85th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.69% (0.02686) | 81.17th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.69% (0.02686) | 62.66th | v2 (v2022.01.01) |
References (21)
- http://bugs.python.org/issue13703 x_refsource_CONFIRMExploit
- http://lists.apple.com/archives/security-announce/2013/Oct/msg00004.html vendor-advisoryx_refsource_APPLE
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html vendor-advisoryx_refsource_SUSE
- http://mail.python.org/pipermail/python-dev/2011-December/115116.html mailing-listx_refsource_MLIST
- http://mail.python.org/pipermail/python-dev/2012-January/115892.html mailing-listx_refsource_MLIST
- http://python.org/download/releases/2.6.8/ x_refsource_CONFIRMPatchVendor Advisory
- http://python.org/download/releases/2.7.3/ x_refsource_CONFIRMPatchVendor Advisory
- http://python.org/download/releases/3.1.5/ x_refsource_CONFIRMPatchVendor Advisory
- http://python.org/download/releases/3.2.3/ x_refsource_CONFIRMPatchVendor Advisory
- http://secunia.com/advisories/50858 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/51087 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/51089 third-party-advisoryx_refsource_SECUNIA
- http://www.openwall.com/lists/oss-security/2012/03/10/3 mailing-listx_refsource_MLIST
- http://www.ubuntu.com/usn/USN-1592-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-1596-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-1615-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-1616-1 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2012-1150 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=750555 x_refsource_CONFIRMIssue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2012-1150
- https://www.cve.org/CVERecord?id=CVE-2012-1150
Change history (0)
No recorded changes yet.