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Findings

CVE-2026-33170

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

Published Mar 24, 2026 · updated Jun 17, 2026 · rubyonrails rails

Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, does not propagate the flag to the newly created buffer. If a is mutated in place (e.g. via ) and then formatted with using untrusted arguments, the result incorrectly reports , bypassing ERB auto-escaping and possibly leading to XSS. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

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. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, does not propagate the flag to the newly created buffer. If a is mutated in place (e.g. via ) and then formatted with using untrusted arguments, the result incorrectly reports , bypassing ERB auto-escaping and possibly leading to XSS. Versio

  2. Jun 17, 2026 · NIST NVD

    Updated

    Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, does not propagate the flag to the newly created buffer. If a is mutated in place (e.g. via ) and then formatted with using untrusted arguments, the result incorrectly reports , bypassing ERB auto-escaping and possibly leading to XSS. Versio

Affected

  • cpe rubyonrails/railsversion unspecified

Sources

  • CVE.orgVulnerability recordCVE-2026-33170

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2026-33170

    Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, does not propagate the flag to the newly created buffer. If a is mutated in pl

    nvd.nist.gov

References