CVE-2026-82744

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The reduce treated that identically to a guard whose condition was simply not met and bypassed the change. So when a guard raises (for example on attacker-influenced input), a change that enforces a security-relevant modification is skipped rather than failing the step. The fix distinguishes a raised exception (now <code>{:raised, error}</code>) and halts the step with an error, failing closed.</p>\n<p>This issue affects ash: from 3.0.0-rc.17 before 3.32.2.</p>"}, {"base64": false, "type": "text/markdown", "value": "Not Failing Securely (Failing Open) vulnerability in ash-project ash skips an `Ash.Reactor` change when the guard controlling it raises, so a change meant to run does not.\n\nAn `Ash.Reactor` `change` step can be gated by `where` validations that decide whether the change runs. `Ash.Reactor.ChangeStep` (`lib/ash/reactor/steps/change_step.ex`) evaluated those guards in `apply_where_clauses/3`, and `apply_validation` rescued any exception into `{:error, error}`. The reduce treated that identically to a guard whose condition was simply not met and bypassed the change. So when a guard raises (for example on attacker-influenced input), a change that enforces a security-relevant modification is skipped rather than failing the step. The fix distinguishes a raised exception (now `{:raised, error}`) and halts the step with an error, failing closed.\n\nThis issue affects ash: from 3.0.0-rc.17 before 3.32.2."}], "value": "Not Failing Securely (Failing Open) vulnerability in ash-project ash skips an Ash.Reactor change when the guard controlling it raises, so a change meant to run does not.\n\nAn Ash.Reactor change step can be gated by where validations that decide whether the change runs. Ash.Reactor.ChangeStep (lib/ash/reactor/steps/change_step.ex) evaluated those guards in apply_where_clauses/3, and apply_validation rescued any exception into {:error, error}. The reduce treated that identically to a guard whose condition was simply not met and bypassed the change. So when a guard raises (for example on attacker-influenced input), a change that enforces a security-relevant modification is skipped rather than failing the step. The fix distinguishes a raised exception (now {:raised, error}) and halts the step with an error, failing closed.\n\nThis issue affects ash: from 3.0.0-rc.17 before 3.32.2."}], "impacts": [{"capecId": "CAPEC-153", "descriptions": [{"lang": "en", "value": "CAPEC-153 Input Data Manipulation"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "baseScore": 2.1, "baseSeverity": "LOW", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-636", "description": "CWE-636 Not Failing Securely ('Failing Open')", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-09-01T03:39:42.668Z"}, "references": [{"tags": ["vendor-advisory", "related"], "url": "https://github.com/ash-project/ash/security/advisories/GHSA-3xq4-m876-fr88"}, {"tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-82744.html"}, {"tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-82744"}, {"tags": ["patch"], "url": "https://github.com/ash-project/ash/commit/6d2eb86ea8d2ba5ffac89c1b8b9bf46e331feabc"}], "source": {"discovery": "EXTERNAL"}, "title": "Ash.Reactor change step fails open, skipping a change when its where guard raises"}, "adp": [{"references": [{"url": "https://github.com/ash-project/ash/security/advisories/GHSA-3xq4-m876-fr88", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-01T15:15:37.062501Z", "id": "CVE-2026-82744", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-01T15:15:56.042Z"}}]}}

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Ash.Reactor.ChangeStep (lib/ash/reactor/steps/change_step.ex) evaluated those guards in apply_where_clauses/3, and apply_validation rescued any exception into {:error, error}. The reduce treated that identically to a guard whose condition was simply not met and bypassed the change. So when a guard raises (for example on attacker-influenced input), a change that enforces a security-relevant modification is skipped rather than failing the step. The fix distinguishes a raised exception (now {:raised, error}) and halts the step with an error, failing closed.\n\nThis issue affects ash: from 3.0.0-rc.17 before 3.32.2.", "supportingMedia": [{"type": "text/html", "value": "<p>Not Failing Securely (Failing Open) vulnerability in ash-project ash skips an <code>Ash.Reactor</code> change when the guard controlling it raises, so a change meant to run does not.</p>\n<p>An <code>Ash.Reactor</code> <code>change</code> step can be gated by <code>where</code> validations that decide whether the change runs. <code>Ash.Reactor.ChangeStep</code> (<code>lib/ash/reactor/steps/change_step.ex</code>) evaluated those guards in <code>apply_where_clauses/3</code>, and <code>apply_validation</code> rescued any exception into <code>{:error, error}</code>. The reduce treated that identically to a guard whose condition was simply not met and bypassed the change. So when a guard raises (for example on attacker-influenced input), a change that enforces a security-relevant modification is skipped rather than failing the step. The fix distinguishes a raised exception (now <code>{:raised, error}</code>) and halts the step with an error, failing closed.</p>\n<p>This issue affects ash: from 3.0.0-rc.17 before 3.32.2.</p>", "base64": false}, {"type": "text/markdown", "value": "Not Failing Securely (Failing Open) vulnerability in ash-project ash skips an `Ash.Reactor` change when the guard controlling it raises, so a change meant to run does not.\n\nAn `Ash.Reactor` `change` step can be gated by `where` validations that decide whether the change runs. `Ash.Reactor.ChangeStep` (`lib/ash/reactor/steps/change_step.ex`) evaluated those guards in `apply_where_clauses/3`, and `apply_validation` rescued any exception into `{:error, error}`. The reduce treated that identically to a guard whose condition was simply not met and bypassed the change. So when a guard raises (for example on attacker-influenced input), a change that enforces a security-relevant modification is skipped rather than failing the step. The fix distinguishes a raised exception (now `{:raised, error}`) and halts the step with an error, failing closed.\n\nThis issue affects ash: from 3.0.0-rc.17 before 3.32.2.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-636", "description": "CWE-636 Not Failing Securely ('Failing Open')"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "3.32.2", "versionStartIncluding": "3.0.0-rc.17"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-09-01T03:39:42.668Z"}}}, "cveMetadata": {"cveId": "CVE-2026-82744", "state": "PUBLISHED", "dateUpdated": "2026-09-01T15:15:56.042Z", "dateReserved": "2026-08-31T01:00:09.774Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-09-01T03:39:42.668Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

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Ash.Reactor.ChangeStep (lib/ash/reactor/steps/change_step.ex) evaluated those guards in apply_where_clauses/3, and apply_validation rescued any exception into {:error, error}. The reduce treated that identically to a guard whose condition was simply not met and bypassed the change. So when a guard raises (for example on attacker-influenced input), a change that enforces a security-relevant modification is skipped rather than failing the step. The fix distinguishes a raised exception (now {:raised, error}) and halts the step with an error, failing closed.\n\nThis issue affects ash: from 3.0.0-rc.17 before 3.32.2."}], "id": "CVE-2026-82744", "lastModified": "2026-09-01T21:15:00.147", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 2.1, "baseSeverity": "LOW", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-82744", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-01T15:15:37.062501Z", "version": "2.0.3"}}]}, "published": "2026-09-01T04:18:04.600", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-82744.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/ash-project/ash/commit/6d2eb86ea8d2ba5ffac89c1b8b9bf46e331feabc"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/ash-project/ash/security/advisories/GHSA-3xq4-m876-fr88"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-82744"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/ash-project/ash/security/advisories/GHSA-3xq4-m876-fr88"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-636"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

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