Vulnerability-Lookup

GHSA-H9MG-HH48-HRWV

Vulnerability from github – Published: 2026-09-16 09:30 – Updated: 2026-09-16 09:30

Details

This nilling was applied to attributes but not to calculations or aggregates. A user-supplied filter reference to a calculation or aggregate carries an Ash.Query.Calculation / Ash.Query.Aggregate struct, which the authorizer's reference replacement did not match (it only matched the Ash.Resource.* structs), so the filter ran against the real value.

As a result, an actor whose field policies forbid a calculation or aggregate can still filter by it (for example filter(secret_calc == "x") or filter(comment_count == n)) and learn the value from whether rows match — an oracle that recovers field-policy-protected values one probe at a time. Filtering is commonly exposed to lower-privileged actors (for example via AshGraphql or AshJsonApi filter arguments), which is exactly the surface field policies are meant to protect.

The fix routes filter references to calculations and aggregates through the same field-policy nilling as attributes.

This issue affects ash: from 2.11.0-rc.0 before 3.33.4.

Severity

6.0 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-86338"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1220"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T09:17:06Z",
    "severity": "MODERATE"
  },
  "details": "Ash field_policies are documented to protect against filter-based information disclosure: when a field the actor may not see is referenced in a filter, it is replaced with an expression that evaluates to nil, so a filter cannot be used as a yes/no oracle to read a value the actor cannot see.\n\nThis nilling was applied to attributes but not to calculations or aggregates. A user-supplied filter reference to a calculation or aggregate carries an Ash.Query.Calculation / Ash.Query.Aggregate struct, which the authorizer\u0027s reference replacement did not match (it only matched the Ash.Resource.* structs), so the filter ran against the real value.\n\nAs a result, an actor whose field policies forbid a calculation or aggregate can still filter by it (for example filter(secret_calc == \"x\") or filter(comment_count == n)) and learn the value from whether rows match \u2014 an oracle that recovers field-policy-protected values one probe at a time. Filtering is commonly exposed to lower-privileged actors (for example via AshGraphql or AshJsonApi filter arguments), which is exactly the surface field policies are meant to protect.\n\nThe fix routes filter references to calculations and aggregates through the same field-policy nilling as attributes.\n\nThis issue affects ash: from 2.11.0-rc.0 before 3.33.4.",
  "id": "GHSA-h9mg-hh48-hrwv",
  "modified": "2026-09-16T09:30:28Z",
  "published": "2026-09-16T09:30:28Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ash-project/ash/security/advisories/GHSA-7qr8-wrvq-566q"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86338"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ash-project/ash/commit/0b6d93c7c4637280b46ae66ea1d2eaf013701238"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ash-project/ash/commit/b3d4503241f3deacb5ceb955e10a4fa927da0f67"
    },
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-86338.html"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-86338"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-86338 (GCVE-0-2026-86338)

Vulnerability from cvelistv5 – Published: 2026-09-16 08:28 – Updated: 2026-09-16 14:49

Title

Ash field policies do not filter-nil forbidden calculations and aggregates, enabling an information-disclosure oracle

Summary

Ash field_policies are documented to protect against filter-based information disclosure: when a field the actor may not see is referenced in a filter, it is replaced with an expression that evaluates to nil, so a filter cannot be used as a yes/no oracle to read a value the actor cannot see. This nilling was applied to attributes but not to calculations or aggregates. A user-supplied filter reference to a calculation or aggregate carries an Ash.Query.Calculation / Ash.Query.Aggregate struct, which the authorizer's reference replacement did not match (it only matched the Ash.Resource.* structs), so the filter ran against the real value. As a result, an actor whose field policies forbid a calculation or aggregate can still filter by it (for example filter(secret_calc == "x") or filter(comment_count == n)) and learn the value from whether rows match — an oracle that recovers field-policy-protected values one probe at a time. Filtering is commonly exposed to lower-privileged actors (for example via AshGraphql or AshJsonApi filter arguments), which is exactly the surface field policies are meant to protect. The fix routes filter references to calculations and aggregates through the same field-policy nilling as attributes. This issue affects ash: from 2.11.0-rc.0 before 3.33.4.

Severity

6 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-16 14:49 UTC

CWE

CWE-1220 - Insufficient Granularity of Access Control

Assigner

EEF mitre root

References

5 references

URL	Tags
https://github.com/ash-project/ash/security/advis…	vendor-advisory
https://cna.erlef.org/cves/CVE-2026-86338.html	related
https://osv.dev/vulnerability/EEF-CVE-2026-86338	related
https://github.com/ash-project/ash/commit/0b6d93c…	related
https://github.com/ash-project/ash/commit/b3d4503…	patch

Impacted products

2 products

Vendor	Product	Version
ash-project	ash	Affected: 2.11.0-rc.0 , < 3.33.4 (semver) cpe:2.3:a:ash-project:ash::::::::
ash-project	ash	Affected: 0b6d93c7c4637280b46ae66ea1d2eaf013701238 , < b3d4503241f3deacb5ceb955e10a4fa927da0f67 (git) cpe:2.3:a:ash-project:ash::::::::

Credits

Jesse Williams Zach Daniel / Ash Project Jonatan Männchen / EEF Jesse Williams

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-86338",
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                "timestamp": "2026-09-16T14:49:09.195379Z",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.