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Vulnerabilities

Vulnerability · CVE-2026-33169

Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework.

Published Mar 24, 2026 · catalog updated Jun 17, 2026 · Active Support is a

Check if you run it

No confirmed exploitation is on record for CVE-2026-33169. EPSS is 0.50%. Act only if a listed version of Active Support is a is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Active Support is a).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.50%
Remediation
Advisory link
Affected products
cpe rubyonrails/rails

Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. uses a lookahead-based regular expression with to insert thousands delimiters. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, the interaction between the repeated lookahead group and can produce quadratic time complexity on long digit strings. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe rubyonrails/railsversion unspecified

How to fix CVE-2026-33169

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-33169. EPSS is 0.50%. Act only if a listed version of Active Support is a is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-1333: Inefficient Regular Expression Complexity; CWE-400: Uncontrolled Resource Consumption. EPSS 0.50%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 24, 2026 · NIST NVD

    Detected

    Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. uses a lookahead-based regular expression with to insert thousands delimiters. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, the interaction between the repeated lookahead group and can produce quadratic time complexity on long digit strings. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 conta

  2. Jun 17, 2026 · NIST NVD

    Updated

    Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. uses a lookahead-based regular expression with to insert thousands delimiters. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, the interaction between the repeated lookahead group and can produce quadratic time complexity on long digit strings. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 conta

Sources

  • CVE.orgVulnerability recordCVE-2026-33169

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-33169

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-2026-33169

    Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. uses a lookahead-based regular expression with to insert thousands delimiters. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, the i

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.