CVE-2026-15157: undici vulnerable to CRLF Injection via blob-like body 'type' property
CSIRTS triage
- What
- CRLF injection vulnerability in handling of blob-like body 'type' property allows injection of carriage return and line feed characters.
- Who is affected
- Applications using undici HTTP client library with untrusted blob-like request bodies.
- Urgency
- Medium priority; not yet exploited in the wild but CRLF injection can enable protocol confusion attacks.
- Action
- Update undici to patched version when available.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-15157
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-2026-151570.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-15157 | coverage & exploitation status | NVD · CVE.org |
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