CRLF injection in Tesla.Multipart.add_content_type_param/2 allows HTTP header injection
Published Jun 2, 2026
2.1
LOWCVSS 4.0
EPSS 0.35%
Description
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.
Affected products
-
- Version 0.8.0StatusaffectedConstraints<1.18.3
- Version
-
- Version StatusaffectedConstraints
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Elixir-Tesla | Tesla | unaffected |
| ||||||
| Elixir-Tesla | Tesla | unaffected |
|
- ≥ 0.8.0 · < 1.18.3
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Vendor solution
Validate content-type parameter strings before passing them to Tesla.Multipart.add_content_type_param/2, rejecting any value that contains \r or \n.
Metrics
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
1 other source (NVD) ▾
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
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Jun 3, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
Jun–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.35% (0.00348) | 26.13th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.17% (0.00170) | 6.65th | v5 (v2026.06.15) |
| Jun 3, 2026 | 0.02% (0.00021) | 6.20th | v4 (v2025.03.14) |
References (7)
- https://cna.erlef.org/cves/CVE-2026-48596.html relatedThird Party Advisory
- https://github.com/advisories/GHSA-q7jx-v53g-848w Advisory
- https://github.com/elixir-tesla/tesla/commit/23601edac5d22ba9407b427967b5bdbda201aec2 patchBroken Link
- https://github.com/elixir-tesla/tesla/commit/6ebfdb9abe9c6f119408045b933d82462decd351 related
- https://github.com/elixir-tesla/tesla/security/advisories/GHSA-q7jx-v53g-848w exploitvendor-advisoryrelatedVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-48596
- https://osv.dev/vulnerability/EEF-CVE-2026-48596 relatedThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://cna.erlef.org/cves/CVE-2026-48596.html | relatedThird Party Advisory | |
| https://github.com/advisories/GHSA-q7jx-v53g-848w | Advisory | |
| https://github.com/elixir-tesla/tesla/commit/23601edac5d22ba9407b427967b5bdbda201aec2 | patchBroken Link | |
| https://github.com/elixir-tesla/tesla/commit/6ebfdb9abe9c6f119408045b933d82462decd351 | related | |
| https://github.com/elixir-tesla/tesla/security/advisories/GHSA-q7jx-v53g-848w | exploitvendor-advisoryrelatedVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-48596 | ||
| https://osv.dev/vulnerability/EEF-CVE-2026-48596 | relatedThird Party Advisory |
Change history (0)
No recorded changes yet.