CVE-2026-120217 Delgan CVE debrief

Who should care

Defenders and security teams using Delgan loguru 0.7.3 should assess exposure and verify vendor remediation or compensating controls. The affected product is Delgan loguru 0.7.3. The vulnerability is located in the AnsiParser.feed function of the loguru/_colorizer.py file. The component ANSI Color-Markup Parser is affected by inefficient regular expression complexity.

Why it matters

CVE-2026-120217 is a vulnerability in Delgan loguru 0.7.3 that allows remote attackers to exploit inefficient regular expression complexity. Defenders and security teams using this version should assess exposure and verify vendor remediation or compensating controls.

• Verify exposure of Delgan loguru 0.7.3 in your environment
• Assess potential remote exploitation attempts
• Monitor for inefficient regular expression complexity

Technical summary

The vulnerability is located in the AnsiParser.feed function of the loguru/_colorizer.py file in Delgan loguru 0.7.3. The component ANSI Color-Markup Parser is affected by inefficient regular expression complexity, allowing remote attackers to exploit this vulnerability. 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. Defenders and security teams using Delgan loguru 0.7.3 should assess exposure and verify vendor remediation or compensating controls.

Defensive priority

Assess exposure of Delgan loguru 0.7.3 in your environment and verify vendor remediation.

Recommended defensive actions

• Assess exposure of Delgan loguru 0.7.3 in your environment
• Verify vendor remediation or compensating controls
• Monitor for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further verification is required to determine the affected scope and remediation. The affected product is Delgan loguru 0.7.3. The vulnerability is located in the AnsiParser.feed function of the loguru/_colorizer.py file. The component ANSI Color-Markup Parser is affected by inefficient regular expression complexity. Defenders should verify vendor remediation or compensating controls.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.