Vulnerability · Published Nov 1, 2026 · Assigned by VulDB

CVE-2026-120217Delgan loguru ANSI Color-Markup _colorizer.py AnsiParser.feed redos

Medium 4.3

In plain English

A medium-severity regular-expression denial of service in loguru from Delgan. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 80.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Delgan	loguru	0.7.3

Weakness: CWE-1333, CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:C

References

VDB-429568 | Delgan loguru ANSI Color-Markup _colorizer.py AnsiParser.feed redos vdb-entry, technical-description
VDB-429568 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
CVE-2026-120217 | CVE Analysis and Report third-party-advisory
Submit #992264 | Delgan loguru 0.7.3 Denial of Service third-party-advisory