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CVE-2026-33176

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

No known exploitation. EPSS puts it in the 59th percentile. Fixed in 7.2.3.1.

CVSS 3.17.5HighEPSS percentile59th0.9% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix7.2.3.1Upgrade to this build
Check it yourself

OpenVAS · 2 checks

e.g. OID 1.3.6.1.4.1.25623.1.1.1.1.2026.6546

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Published Updated Sources: CVE.org, NVD, BDU

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • Rails ActivesupportAffected: >= 8.1.0.beta1, < 8.1.2.1Upgrade to: not statedAffected: >= 8.0.0.beta1, < 8.0.4.1Upgrade to: not statedAffected: < 7.2.3.1Upgrade to: not statedStated by: CVE record
  • Rubyonrails RailsAffected: < 7.2.3.1Upgrade to: 7.2.3.1Stated by: NVD
  • ООО «Ред Софт» РЕД ОСAffected: 7.3Upgrade to: not statedStated by: BDU
  • Red Hat Inc. Red Hat SatelliteAffected: 6Upgrade to: not statedStated by: BDU
  • Rails Core Team Ruby on RailsAffected: до 7.2.3.1Upgrade to: not statedStated by: BDU

Versions as the sources state them. Full version matrix after sign-in

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

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, Active Support number helpers accept strings containing scientific notation (e.g. `1e10000`), which `BigDecimal` expands 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. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS59th
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.9% chance of exploitation activity in the next 30 days, which ranks it in the 59th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

6 events over 213 days, from the signal feeds we watch.

  1. OpenVAS check added
  2. Patch availablerecord updated
  3. Publishedweakness classified, att&ck mapped

Affected products

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Scored 7.5 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality NoneNo confidentiality impact
  • Integrity NoneNo integrity impact
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

And 14 more references. See all after sign-in

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