CVE-2026-33176

highpriority · track · 30EPSS 0.009 · 58 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.86% (58th) EPSS

CVSS 7.5 · high

Is it mine?

27 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.6–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v4.06.6mediumCVSS: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:Usecondary · ENISA EU

v4.06.6mediumCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · security-advisories@github.com

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-400USCWE-400USCWE-400USCWE-770USCWE-770US

affected products (27)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
HCL BigFix≤ Compliance <2.0.18cert_bundDE
Open Source Ruby on Rails< 7.2.3.1cert_bundDE
Open Source Ruby on Rails< 8.0.4.1cert_bundDE
Open Source Ruby on Rails< 8.1.2.1cert_bundDE
rails ActiveSupport≤ < 7.2.3.1enisa_euvdEU
rails ActiveSupport8.0.0.beta1, → 8.0.4.1enisa_euvdEU
rails ActiveSupport8.1.0.beta1, → 8.1.2.1enisa_euvdEU
Rails Core Team Ruby on Rails≤ 7.2.3.1fstec_bduRU
Rails Core Team Ruby on Rails8.0 → 8.0.4.1fstec_bduRU
Rails Core Team Ruby on Rails8.1 → 8.1.2.1fstec_bduRU
Red Hat Inc. Red Hat Satellite≤ 6.16 for RHEL 9fstec_bduRU
Red Hat Inc. Red Hat Satellite≤ 6fstec_bduRU
Red Hat Inc. Red Hat Satellite≤ 6.18 for RHEL 9fstec_bduRU
Red Hat Inc. Red Hat Satellite≤ 6.17 for RHEL 9fstec_bduRU
Red Hat Inc. Red Hat Satellite≤ 6.16 for RHEL 8fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 7.3fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 8.0fstec_bduRU
ООО «РусБИТех-Астра» ПК СВ «Брест»≤ 3.3.4fstec_bduRU

showing 20 of 27

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-0833Ruby on Rails: Mehrere SchwachstellenDeutsch2026-03-23csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Ruby on Rails ausnutzen, um einen Denial of Service Angriff durchzuführen, um Dateien zu manipulieren, und um einen Cross-Site Scripting Angriff durchzuführen.
WID-SEC-W-2026-1687IBM License Metric Tool: Mehrere Schwachstellen ermöglichen nicht spezifizierten AngriffDeutsch2026-05-26csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in IBM License Metric Tool ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.
GHSA-2j26-frm8-cmj9Rails Active Support has a possible DoS vulnerability in its number helpers2026-03-23ghsa · osvUS
### 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).

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund osv NVD CVE.org MITRE

published 2026-03-24modified 2026-08-04

references (23)

External citations — patches, advisories, analysis.

scry

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