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.
CVE-2026-33176
MEDIUMNVD 7.56.6Trending — 4 sources updated this week
EchelonGraph scoreLOW confidence
This medium-severity CVE scores 6.6 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: cna:github_m
6.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 6.6(low)
- EG Risk
- 45(Track)EG Risk 45/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity66% × 45%Exploitation0% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 1%
- EPSS %ILE
- 46%
- KEV
- Not listed
Published
March 23, 2026
Last Modified
June 17, 2026
References (7)
- security-advisories@githubhttps://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcb
- security-advisories@githubhttps://github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1a
- security-advisories@githubhttps://github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856
- security-advisories@githubhttps://github.com/rails/rails/releases/tag/v7.2.3.1
- security-advisories@githubhttps://github.com/rails/rails/releases/tag/v8.0.4.1
- security-advisories@githubhttps://github.com/rails/rails/releases/tag/v8.1.2.1
- security-advisories@githubhttps://github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9
Vendor Advisories for CVE-2026-33176(3)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Patch Availability(2)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | rubygem-activesupport-0:6.1.7.8-2.el9sat | 2026-05-07 | redhat |
| redhat | rubygem-activesupport-0:7.0.8.7-2.el9sat | 2026-05-07 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 4× in last 7d / 4× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-27 14:13 UTCEPSS rescore
- 2026-07-27 12:50 UTCEG score recompute
- 2026-07-27 12:50 UTCVendor advisory
- 2026-07-27 12:50 UTCOSV refresh
Related CVEs(same vendor + same CWE)
Same vendor
10 shownredhat
- CVE-2001-0825EG 10.0HIGH
- CVE-2001-1009EG 10.0EPSS p93HIGH
- CVE-2001-0554EG 10.0EPSS p98HIGH
- CVE-2001-1162EG 10.0EPSS p96HIGH
- CVE-2001-0414EG 10.0EPSS p100HIGH
- CVE-2001-0191EG 10.0EPSS p92HIGH
- CVE-2001-0301EG 10.0EPSS p90HIGH
- CVE-2001-0197EG 10.0EPSS p96HIGH
- CVE-2001-0233EG 10.0EPSS p96HIGH
- CVE-2001-0010EG 10.0EPSS p98HIGH
Same CWE
10 shownCWE-400 · CWE-770
- CVE-2004-1464NVD 5.9EG 9.0 KEVEPSS p92CRITICAL
- CVE-2010-3705EG 8.3HIGH
- CVE-2006-1364NVD 7.5EG 8.2EPSS p99HIGH
- CVE-2008-5180NVD 5.3EG 7.9EPSS p99HIGH
- CVE-2012-0024EG 7.8HIGH
- CVE-2011-3192EG 7.8EPSS p100HIGH
- CVE-2010-4686EG 7.8HIGH
- CVE-2010-4671EG 7.8HIGH
- CVE-2009-2054EG 7.8HIGH
- CVE-2009-2726EG 7.8EPSS p93HIGH
Frequently asked(5)
What is CVE-2026-33176?
CVE-2026-33176 is a medium vulnerability published on March 23, 2026. 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…
When was CVE-2026-33176 disclosed?
CVE-2026-33176 was first published in the National Vulnerability Database on March 23, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33176 actively exploited?
CVE-2026-33176 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.4% of all scored CVEs.
What is the CVSS score of CVE-2026-33176?
CVE-2026-33176 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.6. The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-33176?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33176, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-33176
Is Your Infrastructure Affected by CVE-2026-33176?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.