CVE-2026-82736 (GCVE-0-2026-82736)
Vulnerability from cvelistv5
Published
2026-09-01 03:21
Modified
2026-09-01 13:06
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
Summary
Incorrect Behavior Order: Validate Before Canonicalize vulnerability in ash-project ash lets an attacker store a case-insensitive string value that violates its length or match constraints.
Ash.Type.CiString.apply_constraints/2 (lib/ash/type/ci_string.ex) validated the max_length, min_length, and match constraints against the value as submitted, while the type case-folds the string (per its casing) for storage and comparison. Because validation ran before folding, an attacker can submit a value whose folded form breaks a constraint but whose original form passes: for example, against a match pattern requiring uppercase, an uppercase value that is stored lowercased persists a value the pattern rejects. The fix case-folds the value at the start of apply_constraints/2, so the constraints are checked against the form that is actually stored.
This issue affects ash: from 1.29.0-rc0 before 3.32.2.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ash-project | ash |
Version: 1.29.0-rc0 ≤ cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:* |
|||||||
|
|||||||||
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-82736",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-01T12:58:09.993835Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-01T13:06:35.213Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/ash-project/ash/security/advisories/GHSA-gg9w-7593-hxg9"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.Ash.Type.CiString\u0027"
],
"packageName": "ash",
"packageURL": "pkg:hex/ash",
"product": "ash",
"programFiles": [
"lib/ash/type/ci_string.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.Ash.Type.CiString\u0027:apply_constraints/2"
}
],
"repo": "https://github.com/ash-project/ash",
"vendor": "ash-project",
"versions": [
{
"lessThan": "3.32.2",
"status": "affected",
"version": "1.29.0-rc0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.Ash.Type.CiString\u0027"
],
"packageName": "ash-project/ash",
"packageURL": "pkg:github/ash-project/ash",
"product": "ash",
"programFiles": [
"lib/ash/type/ci_string.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.Ash.Type.CiString\u0027:apply_constraints/2"
}
],
"repo": "https://github.com/ash-project/ash",
"vendor": "ash-project",
"versions": [
{
"lessThan": "d8320b0127c8ef453679d70e5dd23a9506951d21",
"status": "affected",
"version": "f6f5d194bfc7802bd32e48bf2eabd2d97a0109a4",
"versionType": "git"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*",
"versionEndExcluding": "3.32.2",
"versionStartIncluding": "1.29.0-rc0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "Peter Ullrich"
},
{
"lang": "en",
"type": "coordinator",
"value": "Jonatan M\u00e4nnchen / EEF"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Zach Daniel / Ash Project"
},
{
"lang": "en",
"type": "finder",
"value": "Peter Ullrich"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eIncorrect Behavior Order: Validate Before Canonicalize vulnerability in ash-project ash lets an attacker store a case-insensitive string value that violates its length or match constraints.\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003eAsh.Type.CiString.apply_constraints/2\u003c/code\u003e (\u003ccode\u003elib/ash/type/ci_string.ex\u003c/code\u003e) validated the \u003ccode\u003emax_length\u003c/code\u003e, \u003ccode\u003emin_length\u003c/code\u003e, and \u003ccode\u003ematch\u003c/code\u003e constraints against the value as submitted, while the type case-folds the string (per its \u003ccode\u003ecasing\u003c/code\u003e) for storage and comparison. Because validation ran before folding, an attacker can submit a value whose folded form breaks a constraint but whose original form passes: for example, against a match pattern requiring uppercase, an uppercase value that is stored lowercased persists a value the pattern rejects. The fix case-folds the value at the start of \u003ccode\u003eapply_constraints/2\u003c/code\u003e, so the constraints are checked against the form that is actually stored.\u003c/p\u003e\n\u003cp\u003eThis issue affects ash: from 1.29.0-rc0 before 3.32.2.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Incorrect Behavior Order: Validate Before Canonicalize vulnerability in ash-project ash lets an attacker store a case-insensitive string value that violates its length or match constraints.\n\n`Ash.Type.CiString.apply_constraints/2` (`lib/ash/type/ci_string.ex`) validated the `max_length`, `min_length`, and `match` constraints against the value as submitted, while the type case-folds the string (per its `casing`) for storage and comparison. Because validation ran before folding, an attacker can submit a value whose folded form breaks a constraint but whose original form passes: for example, against a match pattern requiring uppercase, an uppercase value that is stored lowercased persists a value the pattern rejects. The fix case-folds the value at the start of `apply_constraints/2`, so the constraints are checked against the form that is actually stored.\n\nThis issue affects ash: from 1.29.0-rc0 before 3.32.2."
}
],
"value": "Incorrect Behavior Order: Validate Before Canonicalize vulnerability in ash-project ash lets an attacker store a case-insensitive string value that violates its length or match constraints.\n\nAsh.Type.CiString.apply_constraints/2 (lib/ash/type/ci_string.ex) validated the max_length, min_length, and match constraints against the value as submitted, while the type case-folds the string (per its casing) for storage and comparison. Because validation ran before folding, an attacker can submit a value whose folded form breaks a constraint but whose original form passes: for example, against a match pattern requiring uppercase, an uppercase value that is stored lowercased persists a value the pattern rejects. The fix case-folds the value at the start of apply_constraints/2, so the constraints are checked against the form that is actually stored.\n\nThis issue affects ash: from 1.29.0-rc0 before 3.32.2."
}
],
"impacts": [
{
"capecId": "CAPEC-267",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-267 Leverage Alternate Encoding"
}
]
}
],
"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-180",
"description": "CWE-180 Incorrect Behavior Order: Validate Before Canonicalize",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-01T03:21:47.332Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/ash-project/ash/security/advisories/GHSA-gg9w-7593-hxg9"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-82736.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-82736"
},
{
"tags": [
"patch"
],
"url": "https://github.com/ash-project/ash/commit/d8320b0127c8ef453679d70e5dd23a9506951d21"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Ash.Type.CiString validates length and match constraints before case folding, allowing constraint bypass"
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-82736",
"datePublished": "2026-09-01T03:21:47.332Z",
"dateReserved": "2026-08-31T00:59:10.001Z",
"dateUpdated": "2026-09-01T13:06:35.213Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-82736\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-01T12:58:09.993835Z\"}}}], \"references\": [{\"url\": \"https://github.com/ash-project/ash/security/advisories/GHSA-gg9w-7593-hxg9\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-01T13:04:58.408Z\"}}], \"cna\": {\"title\": \"Ash.Type.CiString validates length and match constraints before case folding, allowing constraint bypass\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Peter Ullrich\"}, {\"lang\": \"en\", \"type\": \"coordinator\", \"value\": \"Jonatan M\\u00e4nnchen / EEF\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Zach Daniel / Ash Project\"}, {\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Peter Ullrich\"}], \"impacts\": [{\"capecId\": \"CAPEC-267\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-267 Leverage Alternate Encoding\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 2.1, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"LOCAL\", \"baseSeverity\": \"LOW\", \"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\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"LOW\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/ash-project/ash\", \"vendor\": \"ash-project\", \"modules\": [\"\u0027Elixir.Ash.Type.CiString\u0027\"], \"product\": \"ash\", \"versions\": [{\"status\": \"affected\", \"version\": \"1.29.0-rc0\", \"lessThan\": \"3.32.2\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:hex/ash\", \"packageName\": \"ash\", \"programFiles\": [\"lib/ash/type/ci_string.ex\"], \"collectionURL\": \"https://repo.hex.pm\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.Ash.Type.CiString\u0027:apply_constraints/2\"}]}, {\"cpes\": [\"cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/ash-project/ash\", \"vendor\": \"ash-project\", \"modules\": [\"\u0027Elixir.Ash.Type.CiString\u0027\"], \"product\": \"ash\", \"versions\": [{\"status\": \"affected\", \"version\": \"f6f5d194bfc7802bd32e48bf2eabd2d97a0109a4\", \"lessThan\": \"d8320b0127c8ef453679d70e5dd23a9506951d21\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/ash-project/ash\", \"packageName\": \"ash-project/ash\", \"programFiles\": [\"lib/ash/type/ci_string.ex\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.Ash.Type.CiString\u0027:apply_constraints/2\"}]}], \"references\": [{\"url\": \"https://github.com/ash-project/ash/security/advisories/GHSA-gg9w-7593-hxg9\", \"tags\": [\"vendor-advisory\", \"related\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-82736.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-82736\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/ash-project/ash/commit/d8320b0127c8ef453679d70e5dd23a9506951d21\", \"tags\": [\"patch\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Incorrect Behavior Order: Validate Before Canonicalize vulnerability in ash-project ash lets an attacker store a case-insensitive string value that violates its length or match constraints.\\n\\nAsh.Type.CiString.apply_constraints/2 (lib/ash/type/ci_string.ex) validated the max_length, min_length, and match constraints against the value as submitted, while the type case-folds the string (per its casing) for storage and comparison. Because validation ran before folding, an attacker can submit a value whose folded form breaks a constraint but whose original form passes: for example, against a match pattern requiring uppercase, an uppercase value that is stored lowercased persists a value the pattern rejects. The fix case-folds the value at the start of apply_constraints/2, so the constraints are checked against the form that is actually stored.\\n\\nThis issue affects ash: from 1.29.0-rc0 before 3.32.2.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eIncorrect Behavior Order: Validate Before Canonicalize vulnerability in ash-project ash lets an attacker store a case-insensitive string value that violates its length or match constraints.\u003c/p\u003e\\n\u003cp\u003e\u003ccode\u003eAsh.Type.CiString.apply_constraints/2\u003c/code\u003e (\u003ccode\u003elib/ash/type/ci_string.ex\u003c/code\u003e) validated the \u003ccode\u003emax_length\u003c/code\u003e, \u003ccode\u003emin_length\u003c/code\u003e, and \u003ccode\u003ematch\u003c/code\u003e constraints against the value as submitted, while the type case-folds the string (per its \u003ccode\u003ecasing\u003c/code\u003e) for storage and comparison. Because validation ran before folding, an attacker can submit a value whose folded form breaks a constraint but whose original form passes: for example, against a match pattern requiring uppercase, an uppercase value that is stored lowercased persists a value the pattern rejects. The fix case-folds the value at the start of \u003ccode\u003eapply_constraints/2\u003c/code\u003e, so the constraints are checked against the form that is actually stored.\u003c/p\u003e\\n\u003cp\u003eThis issue affects ash: from 1.29.0-rc0 before 3.32.2.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"Incorrect Behavior Order: Validate Before Canonicalize vulnerability in ash-project ash lets an attacker store a case-insensitive string value that violates its length or match constraints.\\n\\n`Ash.Type.CiString.apply_constraints/2` (`lib/ash/type/ci_string.ex`) validated the `max_length`, `min_length`, and `match` constraints against the value as submitted, while the type case-folds the string (per its `casing`) for storage and comparison. Because validation ran before folding, an attacker can submit a value whose folded form breaks a constraint but whose original form passes: for example, against a match pattern requiring uppercase, an uppercase value that is stored lowercased persists a value the pattern rejects. The fix case-folds the value at the start of `apply_constraints/2`, so the constraints are checked against the form that is actually stored.\\n\\nThis issue affects ash: from 1.29.0-rc0 before 3.32.2.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-180\", \"description\": \"CWE-180 Incorrect Behavior Order: Validate Before Canonicalize\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"3.32.2\", \"versionStartIncluding\": \"1.29.0-rc0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-09-01T03:21:47.332Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-82736\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-01T13:06:35.213Z\", \"dateReserved\": \"2026-08-31T00:59:10.001Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-09-01T03:21:47.332Z\", \"assignerShortName\": \"EEF\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
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.
Loading…
Loading…