Bug 2565689

Summary:	CVE-2026-120217 python-loguru: loguru: Denial of Service via inefficient regular expression complexity [epel-10]
Product:	[Fedora] Fedora EPEL	Reporter:	Ganesh <gnaik>
Component:	python-loguru	Assignee:	Ben Beasley <code>
Status:	ON_QA ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	epel10	CC:	code, neuro-sig
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["d8de1a50-9f36-4cda-92c0-63173ce59d6b"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
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Regression:	---	Mount Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2564513

Description Ganesh 2026-11-03 11:02:48 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

A vulnerability was detected in Delgan loguru 0.7.3. The affected element is the function AnsiParser.feed of the file loguru/_colorizer.py of the component ANSI Color-Markup Parser. Performing a manipulation results in inefficient regular expression complexity. The attack is possible to be carried out remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Comment 1 Ben Beasley 2026-11-03 13:57:51 UTC

I reported this upstream. It has been a while since the last release, but the upstream developer has been active lately, so it’s reasonable to hope that they may come up with a patch in the near future. If that happens, I’ll apply it here. Meanwhile, anyone who is using the loguru Python package to log untrusted input should not configure their logger with color=True.

Comment 2 Ben Beasley 2026-11-03 13:58:27 UTC

*** Bug 2565694 has been marked as a duplicate of this bug. ***

Comment 3 Fedora Update System 2026-11-04 10:14:40 UTC

FEDORA-EPEL-2026-2035b2e21b (python-loguru-0.7.3-9.el10_4) has been submitted as an update to Fedora EPEL 10.4.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-2035b2e21b

Comment 4 Fedora Update System 2026-11-04 10:34:26 UTC

FEDORA-EPEL-2026-c167d2d2d7 (python-loguru-0.7.3-9.el10_3) has been submitted as an update to Fedora EPEL 10.3.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-c167d2d2d7

Comment 5 Fedora Update System 2026-11-05 02:49:13 UTC

FEDORA-EPEL-2026-2035b2e21b has been pushed to the Fedora EPEL 10.4 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-2035b2e21b

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-11-05 02:55:54 UTC

FEDORA-EPEL-2026-c167d2d2d7 has been pushed to the Fedora EPEL 10.3 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-c167d2d2d7

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.