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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.
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.
FEDORA-2026-3d50e0ef85 (python-loguru-0.7.3-23.fc46) has been submitted as an update to Fedora 46. https://bodhi.fedoraproject.org/updates/FEDORA-2026-3d50e0ef85
FEDORA-2026-3d50e0ef85 (python-loguru-0.7.3-23.fc46) has been pushed to the Fedora 46 stable repository. If problem still persists, please make note of it in this bug report.
FEDORA-2026-1ec7ec0a69 (python-loguru-0.7.3-23.fc45) has been submitted as an update to Fedora 45. https://bodhi.fedoraproject.org/updates/FEDORA-2026-1ec7ec0a69
FEDORA-2026-1b494a5097 (python-loguru-0.7.3-23.fc44) has been submitted as an update to Fedora 44. https://bodhi.fedoraproject.org/updates/FEDORA-2026-1b494a5097
FEDORA-2026-ea090e0910 (python-loguru-0.7.3-23.fc43) has been submitted as an update to Fedora 43. https://bodhi.fedoraproject.org/updates/FEDORA-2026-ea090e0910