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CVE Record

CVE-2020-29651: A denial of service via regular expression in the py.path.svnwc component of py (aka python-py) through 1.9...

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This vulnerability can let a crafted input make the Python py package spend excessive CPU time in SVN blame handling. The practical business impact is service slowdown or denial of service where affected code processes attacker-controlled blame input. No active exploitation is cited in the supplied sources.

Executive priority

Treat this as a targeted availability risk, not a broad remote takeover issue. Prioritize remediation where SVN blame processing handles external data or where CPU exhaustion could disrupt customer-facing services or CI operations.

Technical view

CVE-2020-29651 is a regular-expression denial of service in py, also called python-py, through 1.9.0. The affected component is py.path.svnwc, specifically blame functionality. The source bundle provides no CVSS score, CWE, or precise vendor product matrix.

Likely exposure

Exposure is most likely in systems that include py/python-py through 1.9.0 and use py.path.svnwc blame against untrusted or attacker-influenced SVN data. General dependency presence alone may not mean reachable exposure.

Exploitation context

The supplied CVE description says malicious input to blame functionality can trigger compute-time denial of service. KEV status is false, and the bundle does not cite public exploitation in the wild.

Researcher notes

Evidence is limited to a ReDoS description, upstream issue and pull request, and vendor advisories. The bundle does not provide CVSS, CWE, exploit maturity, or exact fixed version details beyond affected versions through 1.9.0.

Mitigation direction

  • Inventory uses of py or python-py, especially versions through 1.9.0.
  • Apply relevant vendor or distribution updates from Fedora, Debian, Oracle, or upstream guidance.
  • Reduce or disable untrusted access to SVN blame processing until patched.
  • Prioritize internet-facing or shared automation systems that process external repository data.

Validation and detection

  • Confirm whether py.path.svnwc blame is reachable in applications, CI jobs, or automation.
  • Check package inventories for py/python-py through version 1.9.0.
  • Verify installed packages align with current vendor advisory versions.
  • Review logs for unusual CPU exhaustion during SVN blame operations.
Prepared
Confidence
medium
Sources
9

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
8Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.