CVE-2026-48598: tesla · Improper Encoding or Escaping of Output
Affects teslaSource CVE Database V5
Not known to be exploited · CVSS 2.1 Low : upgrade to 1.18.3 when convenient.
Data as of 30 Oct 2026, 06:59 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 19% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 1.18.3, bb1a2c3da2775924d96e3db8e315dcc4d5d2246e
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 2 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
Public exploit code: GitHub proofs of concept
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Upgrade tesla to 1.18.3; tesla to bb1a2c3da2775924d96e3db8e315dcc4d5d2246e.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| elixir-teslatesla | Affected
| Fixed in
|
| elixir-teslatesla | Affected
| Fixed in
|
Hexteslapkg:hex/teslaOther threats | Affected
| Fixed in
|
Hexteslapkg:hex/teslaOther threats | Affected
| Fixed in
|
CPE configurations (1)
cpe:2.3:a:elixir-tesla:tesla:*:*:*:*:*:*:*:*
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
If you cannot patch yet, users should avoid passing untrusted input directly to multipart disposition parameters or sanitize inputs to remove CR, LF, and double-quote characters before use.
Description
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.
References
- github.com/elixir-tesla/tesla/security/advisories/GHSA-28jh-g32x-v9v4 (opens in a new tab)
- cna.erlef.org/cves/CVE-2026-48598.html (opens in a new tab)
- osv.dev/vulnerability/EEF-CVE-2026-48598 (opens in a new tab)
- github.com/elixir-tesla/tesla/commit/bb1a2c3da2775924d96e3db8e315dcc4d5d2246e (opens in a new tab)
- github.com/elixir-tesla/tesla/commit/6ebfdb9abe9c6f119408045b933d82462decd351 (opens in a new tab)