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Fencer Intel
high 7.5

CVE-2020-29651 json

py vulnerable to Regular Expression Denial of Service

published 5y ago modified 4mo ago also GHSA-hj5v-574p-mj7c , PYSEC-2020-92 , EUVD-2020-0152

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.5%
EPSS 4.5% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

A denial of service via regular expression in the py.path.svnwc component of py (aka python-py) through 1.9.0 could be used by attackers to cause a compute-time denial of service attack by supplying malicious input to the blame functionality.

Patch / fix

  • pypi py 1.10.0
  • python-py Debian 13, Debian 12 1.10.0-1

debian advisories DEBIAN-CVE-2020-29651

  • python-py Ubuntu 18.04 LTS 1.5.2-1ubuntu0.1
  • python-py Ubuntu 20.04 LTS 1.8.1-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2020-29651

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python-py SLE Module for Python 2 15 SP3, SLE Module for Basesystem 15 SP4, SLE Module for Basesystem 15 SP3 +4 more 1.10.0-150000.5.9.2
  • python-apipkg SLE Module for Python 2 15 SP3, SLE Module for Basesystem 15 SP4, SLE Module for Basesystem 15 SP3 +2 more 1.4-150000.3.2.1
  • python-coverage SLE Module for Package Hub 15 SP4, SLE Module for Package Hub 15 SP3, SLE Module for Development Tools 15 SP4 +3 more 4.5.4-150000.3.3.2
  • python-pyflakes openSUSE Leap 15.4, openSUSE Leap 15.3 2.1.1-150000.3.2.2
  • python-iniconfig SLE Module for Python 2 15 SP3, SLE Module for Basesystem 15 SP4, SLE Module for Basesystem 15 SP3 1.1.1-150000.1.3.1
  • python-pycodestyle openSUSE Leap 15.4, openSUSE Leap 15.3 2.5.0-150000.3.2.2
  • python-atomicwrites SLE Module for Public Cloud 15 SP4, SLE Module for Public Cloud 15 SP3, SLE Module for Public Cloud 15 SP2 +5 more 1.1.5-150000.3.2.1
  • kibana OpenStack Cloud Crowbar 8, OpenStack Cloud 8, HPE Helion OpenStack 8 4.6.6-3.9.2

suse advisories SUSE-SU-2022:2831-1SUSE-SU-2021:2554-1SUSE-SU-2021:2236-1SUSE-SU-2021:1963-1SUSE-SU-2021:1962-1SUSE-SU-2021:1859-1

  • python-py openSUSE Tumbleweed 1.11.0-9.5
  • python-py openSUSE Tumbleweed 1.11.0-6.5
  • oci-cli openSUSE Tumbleweed 3.0.2-1.2
  • python-py openSUSE Leap 15.3 1.8.1-5.6.1
  • python-py openSUSE Leap 15.2 1.8.1-lp152.2.6.1
  • python-py-test openSUSE Leap 15.2 1.8.1-lp152.2.6.1

opensuse advisories openSUSE-SU-2026:12027-1openSUSE-SU-2024:14153-1openSUSE-SU-2024:11108-1openSUSE-SU-2021:1859-1openSUSE-SU-2021:0851-1

  • python-py Arch Linux 1.10.0-1

arch linux advisories AVG-1338

Is CVE-2020-29651 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-29651 updated cvss 4.3

python-py: ReDoS in the py.path.svnwc component via mailicious input to blame functionality

  • Red Hat Enterprise Linux 7 python-py
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 python-py, python2-py, python38-py, python39-py Red Hat OpenShift Container Platform 3.11 python-py
    affected: no fix available “Fix deferred”
  • Red Hat OpenStack Platform 10 (Newton) python-py
    affected: no fix planned “Out of support scope”
  • Red Hat OpenStack Platform 13 (Queens) python-py
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 9 python3-py
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.54% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi py
<1.10.0
1.10.0

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.