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CVE-2026-77831— Algorithmic-complexity denial of service in AshPaperTrail full-diff list tracking

Quick assessment

Affected
ash-project ash_paper_trail
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ash Framework AshPaperTrail是Ash Framework组织开源的一款记录数据变更历史的审计跟踪工具。 Ash Framework AshPaperTrail 0.1.1版本至0.7.0之前版本存在资源管理错误漏洞，该漏洞源于FullDiff变更跟踪中AshPaperTrail.ChangeBuilders.FullDiff.ListChange在配对数组元素时通过累加器重建导致复杂度随数组长度呈立方增长，且未限制数组长度，可能允许用户提交大型数组属性导致CPU和内存过度消耗，造

CVSS 2.1 · Low EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
ash-project ash_paper_trail 0.1.1< 0.7.0 affected
449cd2a93416853066378fa61c715e89f80dc854< e781f5d8840b07d57db99f9a4728298837d7b3a8 affected
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I. Basic Information for CVE-2026-77831

Vulnerability Information
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Vulnerability Title
Algorithmic-complexity denial of service in AshPaperTrail full-diff list tracking
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
Ash Framework AshPaperTrail 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ash Framework AshPaperTrail是Ash Framework组织开源的一款记录数据变更历史的审计跟踪工具。 Ash Framework AshPaperTrail 0.1.1版本至0.7.0之前版本存在资源管理错误漏洞，该漏洞源于FullDiff变更跟踪中AshPaperTrail.ChangeBuilders.FullDiff.ListChange在配对数组元素时通过累加器重建导致复杂度随数组长度呈立方增长，且未限制数组长度，可能允许用户提交大型数组属性导致CPU和内存过度消耗，造
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ash-project ash_paper_trail 0.1.1 ~ 0.7.0 cpe:2.3:a:ash-project:ash_paper_trail:*:*:*:*:*:*:*:*
ash-project ash_paper_trail 449cd2a93416853066378fa61c715e89f80dc854 ~ e781f5d8840b07d57db99f9a4728298837d7b3a8 cpe:2.3:a:ash-project:ash_paper_trail:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-77831

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III. Intelligence Information for CVE-2026-77831

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Patches & Fixes for CVE-2026-77831 (1)

Vendor Advisories for CVE-2026-77831 (3)

Same Patch Batch · ash-project · 2026-08-30 · 20 CVEs total

CVE-2026-81636 8.7 HIGH Query-complexity limit bypass via first/last pagination arguments in AshGraphql enables de
CVE-2026-78699 7.2 HIGH rename_tenant returns :ok on a failed rename, enabling cross-tenant access in AshPostgres
CVE-2026-80223 7.1 HIGH Cross-tenant subscription disclosure in AshGraphql authorizes notifications in memory with
CVE-2026-78693 6.9 MEDIUM Incomplete redaction re-attaches the original error path in AshGraphql, leaking internal f
CVE-2026-81633 6.9 MEDIUM Unhandled KeyError in AshGraphql relay node resolution crashes queries via an unknown type
CVE-2026-77970 5.9 MEDIUM Sensitive fields nested in embedded values are not redacted in AshPaperTrail versions
CVE-2026-81319 5.9 MEDIUM Unsafe deserialization of decrypted terms enables node DoS in AshCloak
CVE-2026-77454 5.9 MEDIUM exists/2 predicate silently dropped on limited relationships with a parent() filter in Ash
CVE-2026-78228 5.9 MEDIUM Unbounded handle_error recursion enables denial of service in AshOban triggers
CVE-2026-78038 5.9 MEDIUM Job argument injection via :args overrides primary_key and tenant in AshOban
CVE-2026-75847 5.9 MEDIUM Sensitive attribute values stored in a non-sensitive public changes map in AshPaperTrail
CVE-2026-82367 2.3 LOW Re-entrant synchronous publish in AshGraphql subscription batcher delivers one subscriber'
CVE-2026-81643 2.3 LOW Broken access control in AshGraphql subscription batcher applies authorization suppression
CVE-2026-80227 2.1 LOW SQL string_trim removes only spaces, diverging from in-memory trimming in AshSql
CVE-2026-81316 2.1 LOW Same-named aggregates with differing filters are conflated in AshSql
CVE-2026-81322 2.1 LOW Cloaked plaintext leaks through a non-sensitive action argument in AshCloak
CVE-2026-78691 2.1 LOW Unescaped backslash allows LIKE wildcard injection in AshSql string search
CVE-2026-81318 2.1 LOW Distinct-query aggregate drops the tenant schema prefix, leaking across tenants in AshSql
CVE-2026-77846 2.1 LOW JSON path injection via unescaped get_path segments in AshSqlite

IV. Related Vulnerabilities

Same product: ash_paper_trail
Same vendor: ash-project
Same weakness: CWE-407

V. Comments for CVE-2026-77831

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