Vulnerability-Lookup

CVE-2026-1527 (GCVE-0-2026-1527)

Vulnerability from cvelistv5 – Published: 2026-03-12 20:17 – Updated: 2026-03-13 18:06

Title

undici is vulnerable to CRLF Injection via upgrade option

Summary

ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to: * Inject arbitrary HTTP headers * Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch) The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters: // lib/dispatcher/client-h1.js:1121 if (upgrade) { header += `connection: upgrade\r\nupgrade: ${upgrade}\r\n` }

Severity

4.6 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-13 18:05 UTC

CWE

CWE-93 - Improper neutralization of CRLF sequences ('CRLF injection')

Assigner

openjs CNA under the redhat root

CNA scorecard C 66/100 over 142 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/nodejs/undici/security/advisor…
https://hackerone.com/reports/3487198
https://cna.openjsf.org/security-advisories.html

Impacted products

1 product

Vendor	Product	Version	CPE status
undici	undici	Affected: < 6.24.0; 7.0.0 < 7.24.0 Unaffected: 6.24.0: 7.24.0	guessed

Credits

Matteo Collina Ulises Gascón Raul Vega del Valle

Show details on NVD website

JSON

To clipboard

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RHSA-2026:7670

Vulnerability from csaf_redhat - Published: 2026-04-13 03:00 - Updated: 2026-11-12 17:11

Summary

Red Hat Security Advisory: nodejs:24 security update

Severity

Important

Scope

17 vulnerabilities in this advisory, including CVE-2026-1527.

CVE-2026-1527

A flaw was found in undici, a Node.js HTTP/1.1 client. This vulnerability allows a remote attacker to inject malicious data into HTTP headers or prematurely end HTTP requests by sending specially crafted input to the `upgrade` option of `client.request()`. This is possible because undici does not properly validate input for invalid header characters, which could lead to unauthorized information disclosure or bypassing of security controls.

6.5 (Medium)


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

Fixed: 40 products

https://access.redhat.com/errata/RHSA-2026:7670

Open the full advisory

RHSA-2026:7675

Vulnerability from csaf_redhat - Published: 2026-04-13 02:27 - Updated: 2026-11-12 17:11

Summary

Red Hat Security Advisory: nodejs24 security update

Severity

Important

Scope

18 vulnerabilities in this advisory, including CVE-2026-1527.

CVE-2026-1527

6.5 (Medium)


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

Fixed: 31 products

https://access.redhat.com/errata/RHSA-2026:7675

Open the full advisory

UBUNTU-CVE-2026-1527 (CVE-2026-1527)

Vulnerability from osv_ubuntu – Published: 2026-03-12 21:16 – Updated: 2026-10-17 09:37 – Source website

Details

Severity

4.6 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-1527	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-1527	REPORT

JSON

To clipboard

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          {
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      "package": {
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        }
      ],
      "versions": [
        "5.22.1+dfsg1+~cs20.10.10.2-1ubuntu1",
        "5.26.3+dfsg1+~cs23.10.12-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libllhttp9.2",
            "binary_version": "9.2.1~7.3.0+dfsg1+~cs24.12.11-2"
          },
          {
            "binary_name": "node-llhttp",
            "binary_version": "9.2.1~7.3.0+dfsg1+~cs24.12.11-2"
          },
          {
            "binary_name": "node-undici",
            "binary_version": "7.3.0+dfsg1+~cs24.12.11-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "node-undici",
        "purl": "pkg:deb/ubuntu/node-undici@7.3.0+dfsg1+~cs24.12.11-2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.3.0+dfsg1+~cs24.12.11-1",
        "7.3.0+dfsg1+~cs24.12.11-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-undici",
            "binary_version": "8.9.0+dfsg+~cs3.2.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "node-undici",
        "purl": "pkg:deb/ubuntu/node-undici@8.9.0+dfsg+~cs3.2.0-1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.18.2+dfsg+~cs3.2.0-1build1",
        "7.24.6+dfsg+~cs3.2.0-3",
        "8.5.0+dfsg+~cs3.2.0-2",
        "8.5.0+dfsg+~cs3.2.0-3",
        "8.9.0+dfsg+~cs3.2.0-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-undici",
            "binary_version": "7.18.2+dfsg+~cs3.2.0-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "node-undici",
        "purl": "pkg:deb/ubuntu/node-undici@7.18.2+dfsg+~cs3.2.0-1build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.3.0+dfsg1+~cs24.12.11-2",
        "7.16.0+dfsg+~cs3.2.0-2",
        "7.18.2+dfsg+~cs3.2.0-1",
        "7.18.2+dfsg+~cs3.2.0-1build1"
      ]
    }
  ],
  "aliases": [],
  "details": "ImpactWhen an application passes user-controlled input to the\u00a0upgrade\u00a0option of\u00a0client.request(), an attacker can inject CRLF sequences (\\r\\n) to:   *  Inject arbitrary HTTP headers   *  Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch) The vulnerability exists because undici writes the\u00a0upgrade\u00a0value directly to the socket without validating for invalid header characters: // lib/dispatcher/client-h1.js:1121 if (upgrade) {   header += `connection: upgrade\\r\\nupgrade: ${upgrade}\\r\\n` }",
  "id": "UBUNTU-CVE-2026-1527",
  "modified": "2026-10-17T09:37:47Z",
  "published": "2026-03-12T21:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-1527"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-1527"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-1527"
  ]
}

WID-SEC-W-2026-0933

Vulnerability from csaf_certbund - Published: 2026-03-30 22:00 - Updated: 2026-05-31 22:00

Summary

IBM App Connect Enterprise (Hono und Undici): Mehrere Schwachstellen

Severity

Hoch

Scope

9 vulnerabilities in this advisory, including CVE-2026-1527.

CVE-2026-1527

Known affected: 5 products

Open the full advisory

WID-SEC-W-2026-3596

Vulnerability from csaf_certbund - Published: 2026-09-27 22:00 - Updated: 2026-11-10 23:00

Summary

IBM App Connect Enterprise: Mehrere Schwachstellen

Severity

Hoch

Scope

52 vulnerabilities in this advisory, including CVE-2026-1527.

CVE-2026-1527

Known affected: 11 products

Open the full advisory

WID-SEC-W-2026-3621

Vulnerability from csaf_certbund - Published: 2026-09-28 22:00 - Updated: 2026-11-09 23:00

Summary

IBM App Connect Enterprise: Mehrere Schwachstellen

Severity

Hoch

Scope

16 vulnerabilities in this advisory, including CVE-2026-1527.

CVE-2026-1527

Known affected: 3 products

Open the full advisory

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-1527 (GCVE-0-2026-1527)

RHSA-2026:7670

RHSA-2026:7675

UBUNTU-CVE-2026-1527 (CVE-2026-1527)

WID-SEC-W-2026-0933

WID-SEC-W-2026-3596

WID-SEC-W-2026-3621

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour