CVE-2026-48598

Improper Encoding or Escaping of Output vulnerability in elixir-tesla tesla allows multipart part header injection via unescaped Content-Disposition parameter values. Tesla.Multipart.part_headers_for_disposition/1 interpolates each disposition parameter as #{k}="#{v}" with no validation of CR (\r), LF (\n), or double-quote characters. The values come verbatim from the caller via Tesla.Multipart.add_field/4 (the name parameter), Tesla.Multipart.add_file/3, and Tesla.Multipart.add_file_content/4 (both the filename parameter and other disposition opts). A " in the value closes the quoted parameter early; a \r\n ends the Content-Disposition header line and starts a new part header (such as a forged Content-Type), or, after a second \r\n, ends the entire part header block and prepends bytes to the part body. The default-filename path in add_file/3 derives the filename via Path.basename/1, which does not strip CR or LF, so any application forwarding a partially-attacker-controlled file path inherits the same issue. This issue affects tesla: from 0.8.0 before 1.18.3.

CVSS v3 3.7 LOW

3.7^/10

CVSS v3 : LOW

Vector :

Exploitability : 2.2 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://cna.erlef.org/cves/CVE-2026-48598.html	Third Party Advisory Mitigation
https://github.com/elixir-tesla/tesla/commit/bb1a2c3da2775924d96e3db8e315dcc4d5d2246e	Patch
https://github.com/elixir-tesla/tesla/security/advisories/GHSA-28jh-g32x-v9v4	Vendor Advisory
https://osv.dev/vulnerability/EEF-CVE-2026-48598	Third Party Advisory
https://github.com/elixir-tesla/tesla/security/advisories/GHSA-28jh-g32x-v9v4	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:elixir-tesla:tesla:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-06-02 20:16

Updated : 2026-08-18 19:32

NVD link : CVE-2026-48598

Mitre link : CVE-2026-48598

CVE.ORG link : CVE-2026-48598

JSON object : View

Products Affected

elixir-tesla

tesla

CWE

CWE-116

Improper Encoding or Escaping of Output

{"id": "CVE-2026-48598", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-48598", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-03T14:58:39.064613Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.7, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 2.2}], "cvssMetricV40": [{"type": "Secondary", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "cvssData": {"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:N/VA:N/SC:N/SI:L/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "LOW", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "affectedData": [{"cpes": ["cpe:2.3:a:elixir-tesla:tesla:*:*:*:*:*:*:*:*"], "repo": "https://github.com/elixir-tesla/tesla", "vendor": "elixir-tesla", "modules": ["'Elixir.Tesla.Multipart'"], "product": "tesla", "versions": [{"status": "affected", "version": "0.8.0", "lessThan": "1.18.3", "versionType": "semver"}], "packageURL": "pkg:hex/tesla", "packageName": "tesla", "programFiles": ["lib/tesla/multipart.ex"], "collectionURL": "https://repo.hex.pm", "defaultStatus": "unaffected", "programRoutines": [{"name": "'Elixir.Tesla.Multipart':part_headers_for_disposition/1"}, {"name": "'Elixir.Tesla.Multipart':add_field/4"}, {"name": "'Elixir.Tesla.Multipart':add_file/3"}, {"name": "'Elixir.Tesla.Multipart':add_file_content/4"}]}, {"cpes": ["cpe:2.3:a:elixir-tesla:tesla:*:*:*:*:*:*:*:*"], "repo": "https://github.com/elixir-tesla/tesla.git", "vendor": "elixir-tesla", "modules": ["'Elixir.Tesla.Multipart'"], "product": "tesla", "versions": [{"status": "affected", "version": "6ebfdb9abe9c6f119408045b933d82462decd351", "lessThan": "bb1a2c3da2775924d96e3db8e315dcc4d5d2246e", "versionType": "git"}], "packageURL": "pkg:github/elixir-tesla/tesla", "packageName": "elixir-tesla/tesla", "programFiles": ["lib/tesla/multipart.ex"], "collectionURL": "https://github.com", "defaultStatus": "unaffected", "programRoutines": [{"name": "'Elixir.Tesla.Multipart':part_headers_for_disposition/1"}, {"name": "'Elixir.Tesla.Multipart':add_field/4"}, {"name": "'Elixir.Tesla.Multipart':add_file/3"}, {"name": "'Elixir.Tesla.Multipart':add_file_content/4"}]}]}], "published": "2026-06-02T20:16:38.847", "references": [{"url": "https://cna.erlef.org/cves/CVE-2026-48598.html", "tags": ["Third Party Advisory", "Mitigation"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://github.com/elixir-tesla/tesla/commit/bb1a2c3da2775924d96e3db8e315dcc4d5d2246e", "tags": ["Patch"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://github.com/elixir-tesla/tesla/security/advisories/GHSA-28jh-g32x-v9v4", "tags": ["Vendor Advisory"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://osv.dev/vulnerability/EEF-CVE-2026-48598", "tags": ["Third Party Advisory"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://github.com/elixir-tesla/tesla/security/advisories/GHSA-28jh-g32x-v9v4", "tags": ["Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "description": [{"lang": "en", "value": "CWE-116"}]}], "descriptions": [{"lang": "en", "value": "Improper Encoding or Escaping of Output vulnerability in elixir-tesla tesla allows multipart part header injection via unescaped Content-Disposition parameter values.\n\nTesla.Multipart.part_headers_for_disposition/1 interpolates each disposition parameter as #{k}=\"#{v}\" with no validation of CR (\\r), LF (\\n), or double-quote characters. The values come verbatim from the caller via Tesla.Multipart.add_field/4 (the name parameter), Tesla.Multipart.add_file/3, and Tesla.Multipart.add_file_content/4 (both the filename parameter and other disposition opts). A \" in the value closes the quoted parameter early; a \\r\\n ends the Content-Disposition header line and starts a new part header (such as a forged Content-Type), or, after a second \\r\\n, ends the entire part header block and prepends bytes to the part body. The default-filename path in add_file/3 derives the filename via Path.basename/1, which does not strip CR or LF, so any application forwarding a partially-attacker-controlled file path inherits the same issue.\n\nThis issue affects tesla: from 0.8.0 before 1.18.3."}, {"lang": "es", "value": "Vulnerabilidad de codificaci\u00f3n o escape de salida incorrectos en elixir-tesla tesla permite la inyecci\u00f3n de encabezados de parte multipart a trav\u00e9s de valores de par\u00e1metros Content-Disposition sin escape.\n\nTesla.Multipart.part_headers_for_disposition/1 interpola cada par\u00e1metro de disposici\u00f3n como #{k}=\"#{v}\" sin validaci\u00f3n de caracteres CR (\\r), LF (\\n) o comillas dobles. Los valores provienen textualmente del llamador a trav\u00e9s de Tesla.Multipart.add_field/4 (el par\u00e1metro 'name'), Tesla.Multipart.add_file/3, y Tesla.Multipart.add_file_content/4 (tanto el par\u00e1metro 'filename' como otras opciones de disposici\u00f3n). Una ' en el valor cierra el par\u00e1metro entre comillas prematuramente; un \\r\\n termina la l\u00ednea del encabezado Content-Disposition y comienza un nuevo encabezado de parte (como un Content-Type falsificado), o, despu\u00e9s de un segundo \\r\\n, termina todo el bloque de encabezados de parte y antepone bytes al cuerpo de la parte. La ruta de nombre de archivo predeterminada en add_file/3 deriva el nombre de archivo a trav\u00e9s de Path.basename/1, que no elimina CR o LF, por lo que cualquier aplicaci\u00f3n que reenv\u00ede una ruta de archivo parcialmente controlada por el atacante hereda el mismo problema.\n\nEste problema afecta a tesla: desde 0.8.0 antes de 1.18.3."}], "lastModified": "2026-08-18T19:32:44.033", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:elixir-tesla:tesla:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "876BFB6A-2010-4450-9EA4-F4AF4B78F93F", "versionEndExcluding": "1.18.3", "versionStartIncluding": "0.8.0"}], "operator": "OR"}]}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}