HOMEVULNERABILITIESCVE-2026-33176
HIGH

CVE-2026-33176

CWE-400Published: March 24, 2026· Updated: Mar 24, 2026

7.5
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:3.6th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-33176 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

rubyonrails1 product
rails
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcb
PATCHhttps://github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1a
PATCHhttps://github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856
ADVISORYhttps://github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9

All References (7)

→
https://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcbPatch
→
https://github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1aPatch
→
https://github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856Patch
→
https://github.com/rails/rails/releases/tag/v7.2.3.1Release Notes
→
https://github.com/rails/rails/releases/tag/v8.0.4.1Release Notes
→
https://github.com/rails/rails/releases/tag/v8.1.2.1Release Notes
→
https://github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9Vendor Advisory

Quick Facts

CVE IDCVE-2026-33176
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-400
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedMar 24, 2026

Related CVEs (CWE-400)

CVE-2026-30141
9.8
CVE-2026-8856
9.1
CVE-2026-33155
8.7
CVE-2025-32422
8.7
CVE-2026-7790
8.7
CVE-2025-32437
8.7

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-33176 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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