CVE-2026-21619 (GCVE-0-2026-21619)
Vulnerability from cvelistv5 – Published: 2026-02-27 17:57 – Updated: 2026-05-27 15:40
VLAI
EPSS
VEX
Title
Unsafe Deserialization of Erlang Terms in hex_core
Summary
Uncontrolled Resource Consumption, Deserialization of Untrusted Data vulnerability in hexpm hex_core (hex_api modules), hexpm hex (mix_hex_api modules), erlang rebar3 (r3_hex_api modules) allows Object Injection, Excessive Allocation. This vulnerability is associated with program files src/hex_api.erl, src/mix_hex_api.erl, apps/rebar/src/vendored/r3_hex_api.erl and program routines hex_core:request/4, mix_hex_api:request/4, r3_hex_api:request/4.
This issue affects hex_core: from 0.1.0 before 0.12.1; hex: from 2.3.0 before 2.3.2; rebar3: from 3.9.1 before 3.27.0.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-27 19:08 UTC
Assigner
References
6 references
Impacted products
6 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| hexpm | hex_core |
Affected:
eb327f8edfe45507351e38cc0805aa12fa647f0b , < cdf726095bca85ad2549d146df1e831ae93c2b13
(git)
cpe:2.3:a:hexpm:hex_core:*:*:*:*:*:*:*:* |
||
| hexpm | hex_core |
Affected:
0.1.0 , < 0.12.1
(semver)
cpe:2.3:a:hexpm:hex_core:*:*:*:*:*:*:*:* |
||
| hexpm | hex |
Affected:
314546ac432229518714cc8e3336e916b9da6305 , < 636739f3322514e9303ca335fb630696fcbb3c95
(git)
cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:* |
||
| hexpm | hex |
Affected:
2.3.0 , < 2.3.2
(semver)
cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:* |
||
| erlang | rebar3 |
Affected:
209c02ec57c2cc3207ee0174c3af3675b8dc8f79 , < 1d4478f527e373de0b225951e53115450e0d9b9d
(git)
cpe:2.3:a:erlang:rebar3:*:*:*:*:*:*:*:* |
||
| erlang | rebar3 |
Affected:
3.9.1 , < 3.27.0
(semver)
cpe:2.3:a:erlang:rebar3:*:*:*:*:*:*:*:* |
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"value": "Consumo de Recursos No Controlado, vulnerabilidad de Deserializaci\u00f3n de Datos No Confiables en hexpm hex_core (m\u00f3dulos hex_api), hexpm hex (m\u00f3dulos mix_hex_api), erlang rebar3 (m\u00f3dulos r3_hex_api) permite Inyecci\u00f3n de Objetos, Asignaci\u00f3n Excesiva. Esta vulnerabilidad est\u00e1 asociada con los archivos de programa src/hex_api.erl, src/mix_hex_api.erl, apps/rebar/src/vendored/r3_hex_api.erl y las rutinas de programa hex_core:request/4, mix_hex_api:request/4, r3_hex_api:request/4.\n\nEste problema afecta a hex_core: desde 0.1.0 antes de 0.12.1; hex: desde 2.3.0 antes de 2.3.2; rebar3: desde 3.9.1 antes de 3.27.0."
}
],
"id": "CVE-2026-21619",
"lastModified": "2026-06-17T10:18:48.953",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
"cvssMetricV40": [
{
"cvssData": {
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"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 2.0,
"baseSeverity": "LOW",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "LOW",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "ACTIVE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:L/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",
"version": "4.0",
"vulnAvailabilityImpact": "LOW",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
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"options": [
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},
{
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{
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],
"role": "CISA Coordinator",
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"version": "2.0.3"
}
}
]
},
"published": "2026-02-27T18:16:11.373",
"references": [
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://cna.erlef.org/cves/CVE-2026-21619.html"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"tags": [
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},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"tags": [
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],
"url": "https://github.com/hexpm/hex/commit/636739f3322514e9303ca335fb630696fcbb3c95"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"tags": [
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},
{
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"tags": [
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"Vendor Advisory"
],
"url": "https://github.com/hexpm/hex_core/security/advisories/GHSA-hx9w-f2w9-9g96"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-21619"
}
],
"sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-400"
},
{
"lang": "en",
"value": "CWE-502"
}
],
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
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"cve": "CVE-2026-21619",
"id": "CVE-2026-21619",
"initial_release_date": "2026-02-27T17:57:11.513000+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "hex_core: hex_core, hex, rebar3: Denial of Service due to uncontrolled resource consumption",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21619.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-21619",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-02-27T19:08:49.652728Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-02-27T19:08:54.436Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:hexpm:hex_core:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"hex_api"
],
"packageName": "hexpm/hex_core",
"packageURL": "pkg:github/hexpm/hex_core",
"product": "hex_core",
"programFiles": [
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],
"programRoutines": [
{
"name": "hex_core:request/4"
}
],
"repo": "https://github.com/hexpm/hex_core",
"vendor": "hexpm",
"versions": [
{
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"status": "affected",
"version": "eb327f8edfe45507351e38cc0805aa12fa647f0b",
"versionType": "git"
}
]
},
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
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"defaultStatus": "unaffected",
"modules": [
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"packageName": "hex_core",
"packageURL": "pkg:hex/hex_core",
"product": "hex_core",
"programFiles": [
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],
"programRoutines": [
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}
],
"repo": "https://github.com/hexpm/hex_core",
"vendor": "hexpm",
"versions": [
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"status": "affected",
"version": "0.1.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
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],
"defaultStatus": "unaffected",
"modules": [
"mix_hex_api"
],
"packageName": "hexpm/hex",
"packageURL": "pkg:github/hexpm/hex",
"product": "hex",
"programFiles": [
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],
"programRoutines": [
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"vendor": "hexpm",
"versions": [
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"status": "affected",
"version": "314546ac432229518714cc8e3336e916b9da6305",
"versionType": "git"
}
]
},
{
"cpes": [
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],
"defaultStatus": "unaffected",
"modules": [
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],
"packageName": "hex",
"packageURL": "pkg:otp/hex?repository_url=https:%2F%2Fgithub.com%2Fhexpm%2Fhex.git\u0026vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Fhexpm%2Fhex.git",
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"status": "affected",
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]
},
{
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"cpes": [
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],
"defaultStatus": "unaffected",
"modules": [
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"packageName": "erlang/rebar3",
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"programFiles": [
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],
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"vendor": "erlang",
"versions": [
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"status": "affected",
"version": "209c02ec57c2cc3207ee0174c3af3675b8dc8f79",
"versionType": "git"
}
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},
{
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"cpes": [
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"defaultStatus": "unaffected",
"modules": [
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"packageName": "rebar3",
"packageURL": "pkg:otp/rebar3?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Frebar3.git\u0026vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Frebar3.git",
"product": "rebar3",
"programFiles": [
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],
"programRoutines": [
{
"name": "r3_hex_api:request/4"
}
],
"repo": "https://github.com/erlang/rebar3",
"vendor": "erlang",
"versions": [
{
"lessThan": "3.27.0",
"status": "affected",
"version": "3.9.1",
"versionType": "semver"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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"versionEndExcluding": "0.12.1",
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"vulnerable": true
}
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"operator": "AND"
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],
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],
"credits": [
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"lang": "en",
"type": "finder",
"value": "Michael Lubas / Paraxial.io"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Jonatan M\u00e4nnchen / EEF"
},
{
"lang": "en",
"type": "remediation reviewer",
"value": "Eric Meadows-J\u00f6nsson / Hex.pm"
}
],
"descriptions": [
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"supportingMedia": [
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"value": "Uncontrolled Resource Consumption, Deserialization of Untrusted Data vulnerability in hexpm hex_core (hex_api modules), hexpm hex (mix_hex_api modules), erlang rebar3 (r3_hex_api modules) allows Object Injection, Excessive Allocation.\u003cp\u003e This vulnerability is associated with program files \u003ctt\u003esrc/hex_api.erl\u003c/tt\u003e, \u003ctt\u003esrc/mix_hex_api.erl\u003c/tt\u003e, \u003ctt\u003eapps/rebar/src/vendored/r3_hex_api.erl\u003c/tt\u003e and program routines \u003ctt\u003ehex_core:request/4\u003c/tt\u003e, \u003ctt\u003emix_hex_api:request/4\u003c/tt\u003e, \u003ctt\u003er3_hex_api:request/4\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThis issue affects hex_core: from 0.1.0 before 0.12.1; hex: from 2.3.0 before 2.3.2; rebar3: from 3.9.1 before 3.27.0.\u003c/p\u003e"
}
],
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}
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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
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.
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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.
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