Loading...
Skip to main content
GeekWala

CVE-2026-33176 — Vulnerability in activesupport — CVE Details

MEDIUM

Rails Active Support has a possible DoS vulnerability in its number helpers

Published March 23, 2026Updated September 10, 2026Source: osv

Summary

### Impact Active Support number helpers accept strings containing scientific notation (e.g. `1e10000`), which when converted to a string could be expanded into extremely large decimal representations. This can cause excessive memory allocation and CPU consumption when the expanded number is formatted, possibly resulting in a DoS vulnerability. ### Releases The fixed releases are available at the normal locations. ### Credit This issue was responsibly reported by Hackerone researcher [manun](https://hackerone.com/manun).

Advisory Timeline

  • First published March 23, 2026 (203 days ago).
  • Last revised September 10, 2026 — 170 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Bundler
Update activesupport to 7.2.3.1 or later
gem install activesupport -v 7.2.3.1
Bundler
Update activesupport to 8.1.2.1 or later
gem install activesupport -v 8.1.2.1
Bundler
Update activesupport to 8.0.4.1 or later
gem install activesupport -v 8.0.4.1

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

Affects 1 ecosystem: rubygems (1).

PackageEcosystemAffectedFixed In
activesupport
rubygems
1.0.0, 1.0.1, 1.0.2, 1.0.3 (+478 more)7.2.3.1
activesupport
rubygems
8.1.0, 8.1.0.beta1, 8.1.0.rc1, 8.1.1 (+1 more)8.1.2.1
activesupport
rubygems
8.0.0, 8.0.0.1, 8.0.0.beta1, 8.0.0.rc1 (+6 more)8.0.4.1

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-400
    Uncontrolled Resource ConsumptionMITRE
  • CWE-770
    Allocation of Resources Without LimitsMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

References

Frequently Asked Questions

What is CVE-2026-33176?
Rails Active Support has a possible DoS vulnerability in its number helpers This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2026-33176?
CVE-2026-33176 affects activesupport. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-33176 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.5

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-2j26-frm8-cmj9

Related CVEs

More RubyGems advisories

Check if you're affected

Scan your dependencies to see if this vulnerability affects your projects.

Scan Your Dependencies