CVE-2026-56814 (GCVE-0-2026-56814)
Vulnerability from cvelistv5 – Published: 2026-07-10 11:14 – Updated: 2026-09-24 21:31
VLAI
EPSS
VEX
Title
Plug: multipart :length limit is not charged for part headers, enabling unbounded temp-file creation (denial of service)
Summary
Plug.Parsers.MULTIPART, the multipart request-body parser used to handle file uploads and multipart forms, does not enforce its :length budget against all consumed resources, allowing an unauthenticated remote attacker to cause denial of service. The parser charges the :length limit only for part body bytes; part header bytes are never counted, and a part with an empty body costs zero.
Because every part whose Content-Disposition carries a non-empty filename creates a fresh temporary file (via Plug.Upload) and retains a Plug.Upload struct for the duration of the request, an attacker can send a single request composed of many empty-body file parts. Such a request stays well under the configured :length limit (8,000,000 bytes by default) while creating one temporary file per part, leading to inode and disk exhaustion and unbounded memory growth. Any application using Plug.Parsers with the :multipart parser is affected, and no authentication is required, only reachability of a multipart endpoint over HTTP.
This vulnerability is associated with program files lib/plug/parsers/multipart.ex and program routines Plug.Parsers.MULTIPART.parse_multipart/2, Plug.Parsers.MULTIPART.parse_multipart_headers/5, Plug.Parsers.MULTIPART.parse_multipart_body/4, and Plug.Parsers.MULTIPART.parse_multipart_file/4.
This issue affects plug: from 1.4.0-rc.0 before 1.16.6, from 1.17.0 before 1.17.4, from 1.18.0 before 1.18.5, from 1.19.1 before 1.19.5, and from 1.20.0 before 1.20.3.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-10 14:03 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
10 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| elixir-plug | plug |
Affected:
1.4.0-rc.0 , < 1.16.6
(semver)
Affected: 1.17.0 , < 1.17.4 (semver) Affected: 1.18.0 , < 1.18.5 (semver) Affected: 1.19.1 , < 1.19.5 (semver) Affected: 1.20.0 , < 1.20.3 (semver) cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:* |
||
| elixir-plug | plug |
Affected:
c52b2f32c90bccd718202bafccb5f95594e30183 , < *
(git)
cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:* |
Date Public
2026-07-10 11:14
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"value": "Plug.Parsers.MULTIPART, the multipart request-body parser used to handle file uploads and multipart forms, does not enforce its :length budget against all consumed resources, allowing an unauthenticated remote attacker to cause denial of service. The parser charges the :length limit only for part body bytes; part header bytes are never counted, and a part with an empty body costs zero.\n\nBecause every part whose Content-Disposition carries a non-empty filename creates a fresh temporary file (via Plug.Upload) and retains a Plug.Upload struct for the duration of the request, an attacker can send a single request composed of many empty-body file parts. Such a request stays well under the configured :length limit (8,000,000 bytes by default) while creating one temporary file per part, leading to inode and disk exhaustion and unbounded memory growth. Any application using Plug.Parsers with the :multipart parser is affected, and no authentication is required, only reachability of a multipart endpoint over HTTP.\n\nThis vulnerability is associated with program files lib/plug/parsers/multipart.ex and program routines Plug.Parsers.MULTIPART.parse_multipart/2, Plug.Parsers.MULTIPART.parse_multipart_headers/5, Plug.Parsers.MULTIPART.parse_multipart_body/4, and Plug.Parsers.MULTIPART.parse_multipart_file/4.\n\nThis issue affects plug: from 1.4.0-rc.0 before 1.16.6, from 1.17.0 before 1.17.4, from 1.18.0 before 1.18.5, from 1.19.1 before 1.19.5, and from 1.20.0 before 1.20.3."
},
{
"lang": "es",
"value": "Plug.Parsers.MULTIPART, el analizador de cuerpo de solicitud multipart utilizado para manejar cargas de archivos y formularios multipart, no aplica su presupuesto de :length contra todos los recursos consumidos, permitiendo a un atacante remoto no autenticado causar denegaci\u00f3n de servicio. El analizador cobra el l\u00edmite de :length solo por los bytes del cuerpo de la parte; los bytes del encabezado de la parte nunca se cuentan, y una parte con un cuerpo vac\u00edo cuesta cero.\n\nDebido a que cada parte cuyo Content-Disposition lleva un nombre de archivo no vac\u00edo crea un archivo temporal nuevo (a trav\u00e9s de Plug.Upload) y retiene una estructura Plug.Upload durante la duraci\u00f3n de la solicitud, un atacante puede enviar una \u00fanica solicitud compuesta de muchas partes de archivo con cuerpo vac\u00edo. Dicha solicitud se mantiene muy por debajo del l\u00edmite de :length configurado (8,000,000 bytes por defecto) mientras crea un archivo temporal por parte, lo que lleva al agotamiento de inodos y disco y a un crecimiento ilimitado de la memoria. Cualquier aplicaci\u00f3n que utilice Plug.Parsers con el analizador :multipart se ve afectada, y no se requiere autenticaci\u00f3n, solo la accesibilidad de un punto final multipart a trav\u00e9s de HTTP.\n\nEsta vulnerabilidad est\u00e1 asociada con los archivos de programa lib/plug/parsers/multipart.ex y las rutinas de programa Plug.Parsers.MULTIPART.parse_multipart/2, Plug.Parsers.MULTIPART.parse_multipart_headers/5, Plug.Parsers.MULTIPART.parse_multipart_body/4 y Plug.Parsers.MULTIPART.parse_multipart_file/4.\n\nEste problema afecta a plug: desde 1.4.0 antes de 1.16.6, desde 1.17.0 antes de 1.17.4, desde 1.18.0 antes de 1.18.5, desde 1.19.0 antes de 1.19.5 y desde 1.20.0 antes de 1.20.3."
}
],
"id": "CVE-2026-56814",
"lastModified": "2026-10-24T23:10:00.160",
"metrics": {
"cvssMetricV40": [
{
"cvssData": {
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"Recovery": "NOT_DEFINED",
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"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 6.9,
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"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",
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"providerUrgency": "NOT_DEFINED",
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"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/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",
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"version": "2.0.3"
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},
"published": "2026-07-10T12:17:24.837",
"references": [
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{
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{
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{
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},
"vulnrichment": {
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"metrics": [
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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{
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"defaultStatus": "unaffected",
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],
"packageName": "plug",
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"product": "plug",
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"programRoutines": [
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},
{
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},
{
"name": "\u0027Elixir.Plug.Parsers.MULTIPART\u0027:parse_multipart_body/4"
},
{
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}
],
"repo": "https://github.com/elixir-plug/plug",
"vendor": "elixir-plug",
"versions": [
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{
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"status": "affected",
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{
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"status": "affected",
"version": "1.19.0",
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{
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"status": "affected",
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"cpes": [
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"programRoutines": [
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{
"name": "\u0027Elixir.Plug.Parsers.MULTIPART\u0027:parse_multipart_headers/5"
},
{
"name": "\u0027Elixir.Plug.Parsers.MULTIPART\u0027:parse_multipart_body/4"
},
{
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"repo": "https://github.com/elixir-plug/plug",
"vendor": "elixir-plug",
"versions": [
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"status": "unaffected"
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{
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},
{
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{
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{
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"lessThan": "*",
"status": "affected",
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"credits": [
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"value": "\u003cp\u003e\u003ctt\u003ePlug.Parsers.MULTIPART\u003c/tt\u003e, the multipart request-body parser used to handle file uploads and multipart forms, does not enforce its \u003ctt\u003e:length\u003c/tt\u003e budget against all consumed resources, allowing an unauthenticated remote attacker to cause denial of service. The parser charges the \u003ctt\u003e:length\u003c/tt\u003e limit only for part body bytes; part header bytes are never counted, and a part with an empty body costs zero.\u003c/p\u003e\u003cp\u003eBecause every part whose \u003ctt\u003eContent-Disposition\u003c/tt\u003e carries a non-empty \u003ctt\u003efilename\u003c/tt\u003e creates a fresh temporary file (via \u003ctt\u003ePlug.Upload\u003c/tt\u003e) and retains a \u003ctt\u003ePlug.Upload\u003c/tt\u003e struct for the duration of the request, an attacker can send a single request composed of many empty-body file parts. Such a request stays well under the configured \u003ctt\u003e:length\u003c/tt\u003e limit (8,000,000 bytes by default) while creating one temporary file per part, leading to inode and disk exhaustion and unbounded memory growth. Any application using \u003ctt\u003ePlug.Parsers\u003c/tt\u003e with the \u003ctt\u003e:multipart\u003c/tt\u003e parser is affected, and no authentication is required, only reachability of a multipart endpoint over HTTP.\u003c/p\u003e\u003cp\u003eThis vulnerability is associated with program files \u003ctt\u003elib/plug/parsers/multipart.ex\u003c/tt\u003e and program routines \u003ctt\u003ePlug.Parsers.MULTIPART.parse_multipart/2\u003c/tt\u003e, \u003ctt\u003ePlug.Parsers.MULTIPART.parse_multipart_headers/5\u003c/tt\u003e, \u003ctt\u003ePlug.Parsers.MULTIPART.parse_multipart_body/4\u003c/tt\u003e, and \u003ctt\u003ePlug.Parsers.MULTIPART.parse_multipart_file/4\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThis issue affects plug: from 1.4.0 before 1.16.6, from 1.17.0 before 1.17.4, from 1.18.0 before 1.18.5, from 1.19.0 before 1.19.5, and from 1.20.0 before 1.20.3.\u003c/p\u003e"
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"dateReserved": "2026-06-23T12:29:02.507Z",
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}
}
}
Loading…
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.