PYSEC-2026-60

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/fastfeedparser/PYSEC-2026-60.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-60
Aliases
Published
2026-04-07T20:16:32Z
Modified
2026-05-20T09:19:00Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

FastFeedParser is a high performance RSS, Atom and RDF parser. Prior to 0.5.10, when parse() fetches a URL that returns an HTML page containing a tag, it recursively calls itself with the redirect URL — with no depth limit, no visited-URL deduplication, and no redirect count cap. An attacker-controlled server that returns an infinite chain of HTML meta-refresh responses causes unbounded recursion, exhausting the Python call stack and crashing the process. This vulnerability can also be chained with the companion SSRF issue to reach internal network targets after bypassing the initial URL check. This vulnerability is fixed in 0.5.10.

References

Affected packages

PyPI / fastfeedparser

Package

Name
fastfeedparser
View open source insights on deps.dev
Purl
pkg:pypi/fastfeedparser

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.5.10

Affected versions

0.*
0.1.0
0.2.0
0.2.1
0.2.2
0.3.0
0.3.1
0.3.2
0.3.3
0.3.4
0.3.5
0.3.7
0.3.8
0.3.9
0.4.0
0.4.1
0.4.2
0.4.3
0.4.4
0.4.5
0.4.6
0.4.7
0.4.8
0.4.9
0.5.0
0.5.1
0.5.2
0.5.3
0.5.4
0.5.5
0.5.6
0.5.7
0.5.8
0.5.9

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/fastfeedparser/PYSEC-2026-60.yaml"