CVE-2026-48596: CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') in elixir-tesla tesla
CVE-2026-48596 is a low-severity vulnerability in the elixir-tesla tesla library affecting versions from 0.8.0 up to but not including 1.18.3. It involves improper neutralization of CRLF sequences in HTTP headers, specifically in the Tesla.Multipart.add_content_type_param/2 function. This function appends user-supplied strings to the content_type_params list without validating for carriage return or line feed characters, allowing HTTP header injection via header splitting. Applications that forward untrusted input into this function are vulnerable.
AI Analysis
Technical Summary
The vulnerability in elixir-tesla tesla arises because Tesla.Multipart.add_content_type_param/2 does not sanitize input for CR (\r) or LF (\n) characters before appending to the multipart content_type_params list. Tesla.Multipart.headers/1 then concatenates these parameters with "; ", constructing the Content-Type header verbatim. If an attacker supplies a parameter containing CRLF sequences, they can split the HTTP header line and inject arbitrary headers into outbound HTTP requests. This affects tesla versions from 0.8.0 before 1.18.3.
Potential Impact
An attacker able to supply untrusted input to Tesla.Multipart.add_content_type_param/2 can inject arbitrary HTTP headers into outbound requests by exploiting CRLF injection. This can lead to HTTP request/response splitting issues, potentially affecting downstream HTTP processing. The CVSS 4.0 base score is 2.1, indicating low severity with limited attack vector (local), low complexity, and no privileges required.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, avoid passing untrusted input to Tesla.Multipart.add_content_type_param/2 or sanitize inputs to remove CR and LF characters before use.
CVE-2026-48596: CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') in elixir-tesla tesla
Description
CVE-2026-48596 is a low-severity vulnerability in the elixir-tesla tesla library affecting versions from 0.8.0 up to but not including 1.18.3. It involves improper neutralization of CRLF sequences in HTTP headers, specifically in the Tesla.Multipart.add_content_type_param/2 function. This function appends user-supplied strings to the content_type_params list without validating for carriage return or line feed characters, allowing HTTP header injection via header splitting. Applications that forward untrusted input into this function are vulnerable.
CVSS v4.0
Score 2.1low
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in elixir-tesla tesla arises because Tesla.Multipart.add_content_type_param/2 does not sanitize input for CR (\r) or LF (\n) characters before appending to the multipart content_type_params list. Tesla.Multipart.headers/1 then concatenates these parameters with "; ", constructing the Content-Type header verbatim. If an attacker supplies a parameter containing CRLF sequences, they can split the HTTP header line and inject arbitrary headers into outbound HTTP requests. This affects tesla versions from 0.8.0 before 1.18.3.
Potential Impact
An attacker able to supply untrusted input to Tesla.Multipart.add_content_type_param/2 can inject arbitrary HTTP headers into outbound requests by exploiting CRLF injection. This can lead to HTTP request/response splitting issues, potentially affecting downstream HTTP processing. The CVSS 4.0 base score is 2.1, indicating low severity with limited attack vector (local), low complexity, and no privileges required.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, avoid passing untrusted input to Tesla.Multipart.add_content_type_param/2 or sanitize inputs to remove CR and LF characters before use.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- EEF
- Date Reserved
- 2026-05-22T09:36:56.834Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1f3494e29bf47b50fa2537
Added to database: 06/02/2026, 19:52:52 UTC
Last enriched: 07/10/2026, 09:32:24 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 135
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