Inefficient Regular Expression Complexity Affecting datahub-ingestion-fips package, versions <1.5.0.1-r2


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.02% (6th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-DATAHUBINGESTIONFIPS-16700945
  • published15 May 2026
  • disclosed6 May 2026

Introduced: 6 May 2026

NewCVE-2026-33079  (opens in a new tab)
CWE-1333  (opens in a new tab)

How to fix?

Upgrade Chainguard datahub-ingestion-fips to version 1.5.0.1-r2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream datahub-ingestion-fips package and not the datahub-ingestion-fips package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

In versions 3.0.0a1 through 3.2.0 of Mistune, there is a ReDoS (Regular Expression Denial of Service) vulnerability in LINK_TITLE_RE that allows an attacker who can supply Markdown for parsing to cause denial of service. The regular expression used for parsing link titles contains overlapping alternatives that can trigger catastrophic backtracking. In both the double-quoted and single-quoted branches, a backslash followed by punctuation can be matched either as an escaped punctuation sequence or as two ordinary characters, creating an ambiguous pattern inside a repeated group. If an attacker supplies Markdown containing repeated ! sequences with no closing quote, the regex engine explores an exponential number of backtracking paths. This is reachable through normal Markdown parsing of inline links and block link reference definitions. A small crafted input can therefore cause significant CPU consumption and make applications using Mistune unresponsive.

CVSS Base Scores

version 3.1