CVE-2026-126067

LOWPre-NVD 3.13.1
EchelonGraph scoreHIGH confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 3.1 from GitHub Security Advisory (severity: LOW) published 2026-11-10. A secondary CVSS source baseline 3.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-122859 (ENISA EUVD) · GHSA-gmj8-hvj3-49mw (GitHub Security Advisories)Source: ENISA EUVD

3.1EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 3.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Action Pack is a framework for handling and responding to web requests. Prior to 8.1.4.1 and 8.0.5.2, Action Pack session stores other than ActionDispatch::Session::CookieStore (CacheStore, MemCacheStore, and third-party stores built on AbstractStore, AbstractSecureStore or the session mixins) write the session cookie without a SameSite attribute, regardless of config.action_dispatch.cookies_same_site_protection, which defaults to :lax. Only CookieStore applies the configured policy. In browsers that do not treat a cookie without the attribute as SameSite=Lax, a cross-site request could carry the session cookie, possibly leading to cross-site request forgery against actions that do not verify an authenticity token, such as those of API-only applications. Applications are affected when they use a session store other than CookieStore and do not pass same_site: to config.session_store. This issue is fixed in versions 8.1.4.1 and 8.0.5.2.

CVSS v3
3.1
EG Score
3.1LOWhigh confidence
EG Risk
14
EG Risk 14/100

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)
Severity31% × 45%
Impact severity (EG Severity): CVSS 3.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (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.
EPSS PROB
0.2%
EPSS %ILE
5th
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 (3.1): severity, escalated by confirmed exploitation. This CVE's 3.1 is its impact severity (EG Severity), not escalated.

EG Severity
3.1 LOWCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-13). 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 every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade 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 every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (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 13, 2026

References (5)

Vendor Advisories for CVE-2026-126067(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 / EcosystemFix (by version range) / PatchReleasedSource
rubygemsactionpack @ 8.1.4.1 (fixes >= 8.1.0.beta1, < 8.1.4.1)—ghsa
rubygemsactionpack @ 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)
PackageVulnerable rangeFix by version rangeDependents
actionpack0.9.0 ... 8.0.5.1 (511 versions)
  • 8.1.0.beta1 up to 8.1.4.1: fixed in 8.1.4.1
  • every version up to 8.0.5.2: fixed in 8.0.5.2
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 9× 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.

  1. 2026-11-13 16:51 UTCEchelonGraph re-scored
  2. 2026-11-13 16:51 UTCGHSA enrichmentGHSA-gmj8-hvj3-49mw · GitHub severity LOW · GitHub CVSS 3.1
  3. 2026-11-13 16:50 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  4. 2026-11-13 16:05 UTCEchelonGraph re-scored
  5. 2026-11-13 16:05 UTCGHSA enrichmentGHSA-gmj8-hvj3-49mw · GitHub severity LOW · GitHub CVSS 3.1
  6. 2026-11-12 22:32 UTCEchelonGraph re-scored
  7. 2026-11-12 22:32 UTCGHSA enrichmentGHSA-gmj8-hvj3-49mw · GitHub severity LOW · GitHub CVSS 3.1
  8. 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  9. 2026-11-11 16:38 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  10. 2026-11-10 21:33 UTCEchelonGraph re-scored
  11. 2026-11-10 21:33 UTCGHSA enrichmentGHSA-gmj8-hvj3-49mw · GitHub severity LOW · GitHub CVSS 3.1
  12. 2026-11-10 21:00 UTCENISA EUVD ID recordedEUVD-2026-122859 · Source: ENISA EUVD
  13. 2026-11-10 20:35 UTCEchelonGraph re-scoredFirst assessed: 3.1 LOW
  14. 2026-11-10 20:34 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-126067?
CVE-2026-126067 is a low-severity vulnerability; its CVE record was published on November 10, 2026. Action Pack is a framework for handling and responding to web requests. Prior to 8.1.4.1 and 8.0.5.2, Action Pack session stores other than ActionDispatch::Session::CookieStore (CacheStore, MemCacheStore, and third-party stores built on AbstractStore, AbstractSecureStore or the session mixins)…
When was the CVE record for CVE-2026-126067 published?
The CVE record for CVE-2026-126067 was published on November 10, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of November 13, 2026; the record at its source may have been updated since.
Is CVE-2026-126067 actively exploited?
CVE-2026-126067 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-126067?
CVE-2026-126067 has a CVSS base score of 3.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-126067?
A fix for CVE-2026-126067 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-126067 are linked in the Vendor Advisories panel on this page.

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