CRLF injection in Tesla.Multipart.add_content_type_param/2 allows HTTP header injection
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') vulnerability in elixir-tesla tesla allows HTTP header injection via Tesla.Multipart.add_content_type_param/2. Tesla.Multipart.add_content_type_param/2 appends caller-supplied strings to the multipart content_type_params list without validating for CR (\r) or LF (\n) characters. Tesla.Multipart.headers/1 then joins these params verbatim with "; " to construct the outgoing Content-Type header value. A param containing \r\n splits the header line, allowing arbitrary headers to be injected into the outbound HTTP request. Any application that forwards untrusted input (such as a user-supplied charset or parameter string) into add_content_type_param/2 is affected. This issue affects tesla: from 0.8.0 before 1.18.3.
CVE-2026-48596
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-48596
tesla
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
tesla
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"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':add_content_type_param/2"
},
{
"name": "'Elixir.Tesla.Multipart':headers/1"
}
]
},
{
"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": "6ebfdb9abe9c6f119408045b933d82462decd351",
"lessThan": "23601edac5d22ba9407b427967b5bdbda201aec2",
"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':add_content_type_param/2"
},
{
"name": "'Elixir.Tesla.Multipart':headers/1"
}
]
}
]- Related CVEs
- CVE-2026-48596
Source reference:
/cveMetadata/cveId
Publisher severity
low
Source reference: /containers/cna/metrics
- Event
- #1903 · Revision 1
- Added to Heist Feed
- Publisher date