Vulnerability-Lookup

FKIE_CVE-2026-15157

Vulnerability from fkie_nvd - Published: 2026-07-29 22:16 - Updated: 2026-08-04 15:41

Severity

4.2 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Summary

undici does not validate the type property of a duck-typed blob-like request body before using it as the Content-Type header on the HTTP/1.1 dispatcher. In undici before 6.28.0, from 7.0.0 up to before 7.29.0, and from 8.0.0 up to before 8.9.0, an application that passes a hand-rolled blob-like body (via request, stream, pipeline, or dispatch) whose type is derived from untrusted input allows an attacker to inject CRLF sequences and append arbitrary HTTP headers, potentially smuggling a second request past the upstream. Native Blob objects are safe because their constructor strips CRLF from the type, and fetch is unaffected because it validates headers, but ecosystem libraries that build duck-typed blob shapes from user input can reach the vulnerable path. This is the same defect class as CVE-2022-35948 and CVE-2026-1527, on a header sink that the earlier fixes did not cover. The issue is fixed in undici 6.28.0, 7.29.0, and 8.9.0.

References

	URL	Tags
	ce714d77-add3-4f53-aff5-83d477b104bb	https://cna.openjsf.org/security-advisories.html	Vendor Advisory
	ce714d77-add3-4f53-aff5-83d477b104bb	https://github.com/nodejs/undici/security/advisories/GHSA-m8rv-5g2x-5cg5	Mitigation, Vendor Advisory

Impacted products

Vendor	Product	Version
nodejs	undici	*
nodejs	undici	*
nodejs	undici	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/undici",
          "product": "undici",
          "vendor": "undici",
          "versions": [
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.28.0",
              "versionType": "semver"
            },
            {
              "lessThan": "7.29.0",
              "status": "affected",
              "version": "7.0.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "7.29.0",
              "versionType": "semver"
            },
            {
              "lessThan": "8.9.0",
              "status": "affected",
              "version": "8.0.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "8.9.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "7C381182-89BF-42BE-B894-F3471E5FFEF5",
              "versionEndExcluding": "6.28.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "A65A272C-EA4F-4F11-8CC6-465F9103A0A2",
              "versionEndExcluding": "7.29.0",
              "versionStartIncluding": "7.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "67B6A438-498D-481B-9C41-49DC00E3B439",
              "versionEndExcluding": "8.9.0",
              "versionStartIncluding": "8.0.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "undici does not validate the type property of a duck-typed blob-like request body before using it as the Content-Type header on the HTTP/1.1 dispatcher. In undici before 6.28.0, from 7.0.0 up to before 7.29.0, and from 8.0.0 up to before 8.9.0, an application that passes a hand-rolled blob-like body (via request, stream, pipeline, or dispatch) whose type is derived from untrusted input allows an attacker to inject CRLF sequences and append arbitrary HTTP headers, potentially smuggling a second request past the upstream. Native Blob objects are safe because their constructor strips CRLF from the type, and fetch is unaffected because it validates headers, but ecosystem libraries that build duck-typed blob shapes from user input can reach the vulnerable path. This is the same defect class as CVE-2022-35948 and CVE-2026-1527, on a header sink that the earlier fixes did not cover. The issue is fixed in undici 6.28.0, 7.29.0, and 8.9.0."
    }
  ],
  "id": "CVE-2026-15157",
  "lastModified": "2026-08-04T15:41:50.450",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.2,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
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        "impactScore": 2.5,
        "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "type": "Secondary"
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          "attackComplexity": "LOW",
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          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.5,
        "source": "nvd@nist.gov",
        "type": "Primary"
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          "timestamp": "2026-07-30T14:20:35.188091Z",
          "version": "2.0.3"
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  "published": "2026-07-29T22:16:52.463",
  "references": [
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      "tags": [
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      "url": "https://cna.openjsf.org/security-advisories.html"
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    }
  ],
  "sourceIdentifier": "ce714d77-add3-4f53-aff5-83d477b104bb",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      ],
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
      "type": "Secondary"
    }
  ]
}

CVE-2026-15157 (GCVE-0-2026-15157)

Vulnerability from cvelistv5 – Published: 2026-07-29 21:17 – Updated: 2026-07-30 15:18

Title

undici vulnerable to CRLF Injection via blob-like body 'type' property

Summary

Severity

4.2 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

Assigner

openjs

References

2 references

URL	Tags
https://github.com/nodejs/undici/security/advisor…
https://cna.openjsf.org/security-advisories.html

Impacted products

1 product

Vendor	Product	Version
undici	undici	Affected: 0 , < 6.28.0 (semver) Unaffected: 6.28.0 (semver) Affected: 7.0.0 , < 7.29.0 (semver) Unaffected: 7.29.0 (semver) Affected: 8.0.0 , < 8.9.0 (semver) Unaffected: 8.9.0 (semver)

Credits

mcollina UlisesGascon

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-15157",
                "options": [
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                    "Exploitation": "none"
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-30T14:20:35.188091Z",
                "version": "2.0.3"
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-15157

CVE-2026-15157 (GCVE-0-2026-15157)

Tags

Sightings

Nomenclature