EUVD-2026-72014Severity by source
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/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
Attack is network-delivered via API; AV:N corrects vendor AV:L; AC:L because combining-mark generation is trivial; I:L for constraint-bypass data write; A:H for storage exhaustion.
Primary rating from Vendor (EEF).
CVSS VectorVendor: EEF
Lifecycle Timeline
3DescriptionCVE.org
Improper Validation of Specified Quantity in Input vulnerability in ash-project ash allows an attacker to store a value of arbitrary size in an attribute whose length constraint should bound it.
Ash measures string length with Elixir's String.length/1, which counts Unicode graphemes, in the max_length and min_length constraints of Ash.Type.String (apply_constraints/2 in lib/ash/type/string.ex), in Ash.Resource.Validation.StringLength, and in the string_length expression function. A grapheme carries an unbounded number of combining marks, so a base character followed by a million combining acute accents is one grapheme and megabytes of data, and satisfies max_length: 2. Where the data layer imposes no independent limit (ETS, Mnesia, or a Postgres text column) the whole value is persisted, so an attacker can write an entire request body into an attribute declared with a small maximum and grow storage without bound.
The counting unit also disagrees with the storage layer, which counts codepoints rather than graphemes, so a value accepted by the constraint can still be rejected or truncated by the column. A Postgres varchar(n) column bounds the value itself and is not exposed.
This issue affects ash: from 0.10.0 before 3.33.0.
AnalysisAI
Unbounded string storage in Ash Framework versions 0.10.0 through 3.32.x allows unauthenticated attackers to bypass max_length and min_length constraints by submitting Unicode strings whose grapheme count is small but whose codepoint and byte footprint is arbitrarily large. Ash's constraint logic calls Elixir's String.length/1, which counts graphemes; a single base character followed by millions of combining accent codepoints is one grapheme but megabytes of data, satisfying max_length: 2 while writing the entire payload to storage. …
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Vulnerability AssessmentAI
| Exploitation | The target application must run Ash versions 0.10.0-3.32.x and must expose at least one attribute or validation using max_length, min_length, Ash.Resource.Validation.StringLength, or the string_length/1 expression function. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 4.0 vector (AV:L/AC:L/AT:P/PR:N/VA:H) scores 5.9 and correctly captures the high availability impact and the specific attack requirement (AT:P - unbounded storage backing). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to Ash 3.33.0 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
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