CVE-2026-12143: form-data does not escape CR/LF/quote in multipart field names and filenames (CRLF injection)
CSIRTS triage
- What
- The form-data library does not escape CR/LF/quote in multipart field names and filenames, leading to CRLF injection.
- Who is affected
- Applications using the form-data library are affected.
- Urgency
- Remediation is high urgency due to the high severity rating.
- Action
- Update the form-data library to a patched version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-12143
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-121430.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-12143 | coverage & exploitation status | NVD · CVE.org |
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