CVE-2026-77831 (GCVE-0-2026-77831)
Vulnerability from cvelistv5
Published
2026-08-30 00:18
Modified
2026-08-30 00:18
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Summary
Inefficient Algorithmic Complexity vulnerability in ash-project ash_paper_trail allows a user who can submit a large array attribute to a paper-trailed create or update action to cause a denial of service through excessive CPU and memory use.
With full-diff change tracking, AshPaperTrail.ChangeBuilders.FullDiff.ListChange pairs each prior array element against the new list by rebuilding the remaining-elements accumulator with acc ++ [tuple] on every step, copying the growing list each time, so the pairing scales cubically in the array length. Nothing bounds the length and the value comes straight from action input, so one request carrying a large accepted {:array, _} attribute forces tens of seconds of CPU and multi-gigabyte allocations.
This issue affects ash_paper_trail: from 0.1.1 before 0.7.0.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ash-project | ash_paper_trail |
Version: 0.1.1 ≤ cpe:2.3:a:ash-project:ash_paper_trail:*:*:*:*:*:*:*:* |
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{
"containers": {
"cna": {
"affected": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:ash-project:ash_paper_trail:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.AshPaperTrail.ChangeBuilders.FullDiff.ListChange\u0027"
],
"packageName": "ash_paper_trail",
"packageURL": "pkg:hex/ash_paper_trail",
"product": "ash_paper_trail",
"programFiles": [
"lib/change_builders/full_diff/list_change.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.AshPaperTrail.ChangeBuilders.FullDiff.ListChange\u0027:build/2"
}
],
"repo": "https://github.com/ash-project/ash_paper_trail",
"vendor": "ash-project",
"versions": [
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"status": "affected",
"version": "0.1.1",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:ash-project:ash_paper_trail:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.AshPaperTrail.ChangeBuilders.FullDiff.ListChange\u0027"
],
"packageName": "ash-project/ash_paper_trail",
"packageURL": "pkg:github/ash-project/ash_paper_trail",
"product": "ash_paper_trail",
"programFiles": [
"lib/change_builders/full_diff/list_change.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.AshPaperTrail.ChangeBuilders.FullDiff.ListChange\u0027:build/2"
}
],
"repo": "https://github.com/ash-project/ash_paper_trail",
"vendor": "ash-project",
"versions": [
{
"lessThan": "e781f5d8840b07d57db99f9a4728298837d7b3a8",
"status": "affected",
"version": "449cd2a93416853066378fa61c715e89f80dc854",
"versionType": "git"
}
]
}
],
"configurations": [
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"value": "\u003cp\u003eThe resource must use full-diff change tracking (\u003ccode\u003echange_tracking_mode :full_diff\u003c/code\u003e) and accept an array attribute with no effective maximum length, reached through a create or update action exposed to the input.\u003c/p\u003e"
},
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"value": "The resource must use full-diff change tracking (`change_tracking_mode :full_diff`) and accept an array attribute with no effective maximum length, reached through a create or update action exposed to the input."
}
],
"value": "The resource must use full-diff change tracking (change_tracking_mode :full_diff) and accept an array attribute with no effective maximum length, reached through a create or update action exposed to the input."
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:ash-project:ash_paper_trail:*:*:*:*:*:*:*:*",
"versionEndExcluding": "0.7.0",
"versionStartIncluding": "0.1.1",
"vulnerable": true
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],
"negate": false,
"operator": "OR"
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],
"operator": "AND"
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"credits": [
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"lang": "en",
"type": "finder",
"value": "Peter Ullrich"
},
{
"lang": "en",
"type": "reporter",
"value": "Peter Ullrich"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Zach Daniel / Ash Project"
},
{
"lang": "en",
"type": "coordinator",
"value": "Jonatan M\u00e4nnchen / EEF"
}
],
"descriptions": [
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"lang": "en",
"supportingMedia": [
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"value": "\u003cp\u003eInefficient Algorithmic Complexity vulnerability in ash-project ash_paper_trail allows a user who can submit a large array attribute to a paper-trailed create or update action to cause a denial of service through excessive CPU and memory use.\u003c/p\u003e\n\u003cp\u003eWith full-diff change tracking, \u003ccode\u003eAshPaperTrail.ChangeBuilders.FullDiff.ListChange\u003c/code\u003e pairs each prior array element against the new list by rebuilding the remaining-elements accumulator with \u003ccode\u003eacc ++ [tuple]\u003c/code\u003e on every step, copying the growing list each time, so the pairing scales cubically in the array length. Nothing bounds the length and the value comes straight from action input, so one request carrying a large accepted \u003ccode\u003e{:array, _}\u003c/code\u003e attribute forces tens of seconds of CPU and multi-gigabyte allocations.\u003c/p\u003e\n\u003cp\u003eThis issue affects ash_paper_trail: from 0.1.1 before 0.7.0.\u003c/p\u003e"
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"value": "Inefficient Algorithmic Complexity vulnerability in ash-project ash_paper_trail allows a user who can submit a large array attribute to a paper-trailed create or update action to cause a denial of service through excessive CPU and memory use.\n\nWith full-diff change tracking, `AshPaperTrail.ChangeBuilders.FullDiff.ListChange` pairs each prior array element against the new list by rebuilding the remaining-elements accumulator with `acc ++ [tuple]` on every step, copying the growing list each time, so the pairing scales cubically in the array length. Nothing bounds the length and the value comes straight from action input, so one request carrying a large accepted `{:array, _}` attribute forces tens of seconds of CPU and multi-gigabyte allocations.\n\nThis issue affects ash_paper_trail: from 0.1.1 before 0.7.0."
}
],
"value": "Inefficient Algorithmic Complexity vulnerability in ash-project ash_paper_trail allows a user who can submit a large array attribute to a paper-trailed create or update action to cause a denial of service through excessive CPU and memory use.\n\nWith full-diff change tracking, AshPaperTrail.ChangeBuilders.FullDiff.ListChange pairs each prior array element against the new list by rebuilding the remaining-elements accumulator with acc ++ [tuple] on every step, copying the growing list each time, so the pairing scales cubically in the array length. Nothing bounds the length and the value comes straight from action input, so one request carrying a large accepted {:array, _} attribute forces tens of seconds of CPU and multi-gigabyte allocations.\n\nThis issue affects ash_paper_trail: from 0.1.1 before 0.7.0."
}
],
"impacts": [
{
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"descriptions": [
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}
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],
"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:N/VA:L/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "LOW",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
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"format": "CVSS",
"scenarios": [
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"value": "GENERAL"
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"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-407",
"description": "CWE-407 Inefficient Algorithmic Complexity",
"lang": "en",
"type": "CWE"
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],
"providerMetadata": {
"dateUpdated": "2026-08-30T00:18:38.078Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/ash-project/ash_paper_trail/security/advisories/GHSA-7c66-59m8-723c"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-77831.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-77831"
},
{
"tags": [
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"url": "https://github.com/ash-project/ash_paper_trail/commit/e781f5d8840b07d57db99f9a4728298837d7b3a8"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Algorithmic-complexity denial of service in AshPaperTrail full-diff list tracking"
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-77831",
"datePublished": "2026-08-30T00:18:38.078Z",
"dateReserved": "2026-08-27T16:30:01.792Z",
"dateUpdated": "2026-08-30T00:18:38.078Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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