CVE-2026-33169 | rails activesupport prior 7.2.3.1/8.0.4.1/8.1.2.1 Regular Expression resource consumption (GHSA-cg4j-q9v8-6v38)

VDB-352642 · CVE-2026-33169 · GHSA-CG4J-Q9V8-6V38 RAILS ACTIVESUPPORT PRIOR 7.2.3.1/8.0.4.1/8.1.2.1 REGULAR EXPRESSION RESOURCE CONSUMPTION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.1 $0-$5k 1.74+ Summaryinfo A vulnerability labeled as problematic has been found in rails activesupport. This issue affects some unknown processing of the component Regular Expression Handler. Executing a manipulation can lead to resource consumption. This vulnerability is tracked as CVE-2026-33169. The attack can be launched remotely. No exploit exists. The affected component should be upgraded. Detailsinfo A vulnerability has been found in rails activesupport and classified as problematic. This vulnerability affects an unknown part of the component Regular Expression Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. CVE summarizes: 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. The advisory is available at github.com. This vulnerability was named CVE-2026-33169 since 03/17/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project. Upgrading to version 7.2.3.1, 8.0.4.1 or 8.1.2.1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 29154f1097da13d48fdb3200760b3e3da66dcb11 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version. Productinfo Vendor rails Name activesupport License open-source CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 5.3 VulDB Meta Temp Score: 5.1 VulDB Base Score: 5.3 VulDB Temp Score: 5.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Resource consumption CWE: CWE-400 / CWE-404 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: activesupport 7.2.3.1/8.0.4.1/8.1.2.1 Patch: 29154f1097da13d48fdb3200760b3e3da66dcb11 Timelineinfo 03/17/2026 CVE reserved 03/24/2026 +7 days Advisory disclosed 03/24/2026 +0 days VulDB entry created 03/24/2026 +0 days VulDB entry last update Sourcesinfo Advisory: GHSA-cg4j-q9v8-6v38 Status: Confirmed CVE: CVE-2026-33169 (🔒) GCVE (CVE): GCVE-0-2026-33169 GCVE (VulDB): GCVE-100-352642 Entryinfo Created: 03/24/2026 02:53 Changes: 03/24/2026 02:53 (70) Complete: 🔍 Cache ID: 99:AB6:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸