HOMEVULNERABILITIESCVE-2026-33169
MEDIUM

CVE-2026-33169

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

5.3
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:2.6th

Official Description

Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. `NumberToDelimitedConverter` uses a lookahead-based regular expression with `gsub!` to insert thousands delimiters. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, the interaction between the repeated lookahead group and `gsub!` can produce quadratic time complexity on long digit strings. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

NVD Source

Technical Analysis

CVE-2026-33169 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.

CVSS v3.1 Vector Breakdown

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

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/29154f1097da13d48fdb3200760b3e3da66dcb11
PATCHhttps://github.com/rails/rails/commit/b54a4b373c6f042cab6ee2033246b1c9ecc38974
PATCHhttps://github.com/rails/rails/commit/ec1a0e215efd27a3b3911aae6df978a80f456a49
ADVISORYhttps://github.com/rails/rails/security/advisories/GHSA-cg4j-q9v8-6v38

All References (7)

→
https://github.com/rails/rails/commit/29154f1097da13d48fdb3200760b3e3da66dcb11Patch
→
https://github.com/rails/rails/commit/b54a4b373c6f042cab6ee2033246b1c9ecc38974Patch
→
https://github.com/rails/rails/commit/ec1a0e215efd27a3b3911aae6df978a80f456a49Patch
→
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-cg4j-q9v8-6v38Vendor Advisory

Quick Facts

CVE IDCVE-2026-33169
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-400
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedMar 24, 2026

Related CVEs (CWE-400)

CVE-2026-30141
9.8
CVE-2026-8856
9.1
CVE-2026-7790
8.7
CVE-2025-32424
8.7
CVE-2026-45169
8.7
CVE-2026-33155
8.7

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-33169 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.
← All Vulnerabilities·Search for CVE-2026-33169·NVD