Active Support is a collection of utility classes and standard library extensions used by Rails and other Ruby projects. Prior to 8.1.4.1 and 8.0.5.2, when constant lookup raises LoadError, ActiveSupport::Inflector#safe_constantize (and String#safe_constantize) builds a regular expression from the requested constant name without escaping it, so a caller that passes untrusted input lets the attacker choose the source of a pattern that the application compiles. Crafted patterns can trigger defects in Ruby's regular expression compiler, possibly leading to a crash of the server process, and repeated requests could keep the application unavailable. Action Cable passes the channel value of each subscribe command to safe_constantize before any channel lookup, so an unauthenticated client can reach this code when the application mounts Action Cable and accepts connections from untrusted clients without an added authentication check. This issue is fixed in versions 8.1.4.1 and 8.0.5.2.
CVE-2026-126080
“—” beside the score: it is equal to the CVSS score beside it.
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-11-10. A secondary CVSS source baseline 7.5; sources differ by 0.0.
Also known asEUVD-2026-122930 (ENISA EUVD) · GHSA-8474-xrp6-wh69 (GitHub Security Advisories)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHhigh confidence
- EG Risk
- 49EG Risk 49/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity75% × 45%Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.8% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.8%
- EPSS %ILE
- 58th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.8% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
November 10, 2026
Last Modified
November 12, 2026
Advisory Details (5)
Auto-updated Nov 11, 2026Possible DoS vulnerability in Active Support safe_constantize · Advisory · rails/rails · GitHub
https://github.com/rails/rails/security/advisories/GHSA-8474-xrp6-wh698.1.4.1
Patch available: rails/rails v8.1.4.1
https://github.com/rails/rails/releases/tag/v8.1.4.18.0.5.2
Patch available: rails/rails v8.0.5.2
https://github.com/rails/rails/releases/tag/v8.0.5.2commit 95aa9e416016 (rails/rails)
Fix landed in rails/rails commit 95aa9e416016 — awaiting tagged release
https://github.com/rails/rails/commit/95aa9e416016524956d4904fed96eaed079580bbcommit 210ac22d446c (rails/rails)
Fix landed in rails/rails commit 210ac22d446c — awaiting tagged release
https://github.com/rails/rails/commit/210ac22d446c8e2625b091e79256806b836eee20Vendor Advisories for CVE-2026-126080(1)
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 | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| rubygems | activesupport @ 8.1.4.1 (fixes >= 8.1.0.beta1, < 8.1.4.1) | — | ghsa |
| rubygems | activesupport @ 8.0.5.2 (fixes < 8.0.5.2) | — | ghsa |
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.
Affected Packages
(1 across 1 ecosystem)
RubyGems(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| activesupport | 1.0.0 ... 8.0.5.1 (498 versions) |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 8× in last 7d / 8× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.
- 2026-11-13 16:50 UTCEPSS rescoreEPSS 0.8% · 58th percentile
- 2026-11-12 22:29 UTCEchelonGraph re-scored
- 2026-11-12 22:29 UTCGHSA enrichmentGHSA-8474-xrp6-wh69 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-11-12 19:18 UTCEchelonGraph re-scored
- 2026-11-12 19:17 UTCGHSA enrichmentGHSA-8474-xrp6-wh69 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.8% · 58th percentile
- 2026-11-11 16:38 UTCEPSS rescoreEPSS 0.8% · 57th percentile
- 2026-11-10 23:51 UTCEchelonGraph re-scored
- 2026-11-10 23:51 UTCGHSA enrichmentGHSA-8474-xrp6-wh69 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-11-10 22:00 UTCENISA EUVD ID recordedEUVD-2026-122930 · Source: ENISA EUVD
- 2026-11-10 21:29 UTCEchelonGraph re-scored
- 2026-11-10 21:15 UTCEchelonGraph re-scoredFirst assessed: 7.5 HIGH
- 2026-11-10 21:15 UTCMITRE cvelistV5first tracked
Related CVEs(same product + same CWE)
Same product
10 shownRubyGems:activesupport
Frequently asked(5)
What is CVE-2026-126080?
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Dependency Blast Radius
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