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CVE-2026-12143: form-data does not escape CR/LF/quote in multipart field names and filenames (CRLF injection)

highCVSS 7.5CVE-2026-12143

CSIRTS triage

vendor: nullproduct: form-dataCross-site scripting
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.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.5
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-12143coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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