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CVE-2026-3783 (GCVE-0-2026-3783)

Vulnerability from cvelistv5 – Published: 2026-03-11 10:09 – Updated: 2026-09-15 06:02
VLAI
Title
token leak with redirect and netrc
Summary
When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a redirect to a second URL, curl could leak that token to the second hostname under some circumstances. If the hostname that the first request is redirected to has information in the used .netrc file, with either of the `machine` or `default` keywords, curl would pass on the bearer token set for the first host also to the second one.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-11 14:25 UTC
CWE
  • CWE-522 - Insufficiently Protected Credentials
Assigner
References
Impacted products
Vendor Product Version CPE status
curl curl Affected: 7.33.0 , < 8.14.2 (semver)
Affected: 8.15.0 , < 8.16.1 (semver)
Affected: 8.17.0 , < 8.19.0 (semver)
guessed Create a notification for this product.
curl curl Affected: 06c1bea72faabb6fad4b7ef818aafaa336c9a7aa , < e3d7401a32a46516c9e5ee877e613e62ed35bddc (git)
guessed Create a notification for this product.
curl curl Affected: 8.18.0
Affected: 8.17.0
Affected: 8.16.0
Affected: 8.15.0
Affected: 8.14.1
Affected: 8.14.0
Affected: 8.13.0
Affected: 8.12.1
Affected: 8.12.0
Affected: 8.11.1
Affected: 8.11.0
Affected: 8.10.1
Affected: 8.10.0
Affected: 8.9.1
Affected: 8.9.0
Affected: 8.8.0
Affected: 8.7.1
Affected: 8.7.0
Affected: 8.6.0
Affected: 8.5.0
Affected: 8.4.0
Affected: 8.3.0
Affected: 8.2.1
Affected: 8.2.0
Affected: 8.1.2
Affected: 8.1.1
Affected: 8.1.0
Affected: 8.0.1
Affected: 8.0.0
Affected: 7.88.1
Affected: 7.88.0
Affected: 7.87.0
Affected: 7.86.0
Affected: 7.85.0
Affected: 7.84.0
Affected: 7.83.1
Affected: 7.83.0
Affected: 7.82.0
Affected: 7.81.0
Affected: 7.80.0
Affected: 7.79.1
Affected: 7.79.0
Affected: 7.78.0
Affected: 7.77.0
Affected: 7.76.1
Affected: 7.76.0
Affected: 7.75.0
Affected: 7.74.0
Affected: 7.73.0
Affected: 7.72.0
Affected: 7.71.1
Affected: 7.71.0
Affected: 7.70.0
Affected: 7.69.1
Affected: 7.69.0
Affected: 7.68.0
Affected: 7.67.0
Affected: 7.66.0
Affected: 7.65.3
Affected: 7.65.2
Affected: 7.65.1
Affected: 7.65.0
Affected: 7.64.1
Affected: 7.64.0
Affected: 7.63.0
Affected: 7.62.0
Affected: 7.61.1
Affected: 7.61.0
Affected: 7.60.0
Affected: 7.59.0
Affected: 7.58.0
Affected: 7.57.0
Affected: 7.56.1
Affected: 7.56.0
Affected: 7.55.1
Affected: 7.55.0
Affected: 7.54.1
Affected: 7.54.0
Affected: 7.53.1
Affected: 7.53.0
Affected: 7.52.1
Affected: 7.52.0
Affected: 7.51.0
Affected: 7.50.3
Affected: 7.50.2
Affected: 7.50.1
Affected: 7.50.0
Affected: 7.49.1
Affected: 7.49.0
Affected: 7.48.0
Affected: 7.47.1
Affected: 7.47.0
Affected: 7.46.0
Affected: 7.45.0
Affected: 7.44.0
Affected: 7.43.0
Affected: 7.42.1
Affected: 7.42.0
Affected: 7.41.0
Affected: 7.40.0
Affected: 7.39.0
Affected: 7.38.0
Affected: 7.37.1
Affected: 7.37.0
Affected: 7.36.0
Affected: 7.35.0
Affected: 7.34.0
Affected: 7.33.0
guessed Create a notification for this product.
Credits
spectreglobalsec on hackerone Daniel Stenberg
Show details on NVD website
To clipboard 

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          "value": "spectreglobalsec on hackerone"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer\nperforms a redirect to a second URL, curl could leak that token to the second\nhostname under some circumstances.\n\nIf the hostname that the first request is redirected to has information in the\nused .netrc file, with either of the `machine` or `default` keywords, curl\nwould pass on the bearer token set for the first host also to the second one."
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        },
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          "url": "https://hackerone.com/reports/3583983"
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            "type": "finder"
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            "id": "CWE-522"
          },
          "URL": "https://curl.se/docs/CVE-2026-3783.json",
          "affects": "both",
          "issue": "https://hackerone.com/reports/3583983",
          "last_affected": "8.18.0",
          "package": "curl",
          "severity": "Medium",
          "www": "https://curl.se/docs/CVE-2026-3783.html"
        },
        "details": "When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer\nperforms a redirect to a second URL, curl could leak that token to the second\nhostname under some circumstances.\n\nIf the hostname that the first request is redirected to has information in the\nused .netrc file, with either of the `machine` or `default` keywords, curl\nwould pass on the bearer token set for the first host also to the second one.",
        "id": "CURL-CVE-2026-3783",
        "modified": "2026-09-07T10:34:51.00Z",
        "published": "2026-03-11T08:00:00.00Z",
        "schema_version": "1.5.0",
        "summary": "token leak with redirect and netrc"
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    }
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    "datePublished": "2026-03-11T10:09:08.746Z",
    "dateReserved": "2026-03-08T05:09:09.891Z",
    "dateUpdated": "2026-09-15T06:02:52.569Z",
    "state": "PUBLISHED"
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\"version\": \"7.61.1\"}, {\"status\": \"affected\", \"version\": \"7.61.0\"}, {\"status\": \"affected\", \"version\": \"7.60.0\"}, {\"status\": \"affected\", \"version\": \"7.59.0\"}, {\"status\": \"affected\", \"version\": \"7.58.0\"}, {\"status\": \"affected\", \"version\": \"7.57.0\"}, {\"status\": \"affected\", \"version\": \"7.56.1\"}, {\"status\": \"affected\", \"version\": \"7.56.0\"}, {\"status\": \"affected\", \"version\": \"7.55.1\"}, {\"status\": \"affected\", \"version\": \"7.55.0\"}, {\"status\": \"affected\", \"version\": \"7.54.1\"}, {\"status\": \"affected\", \"version\": \"7.54.0\"}, {\"status\": \"affected\", \"version\": \"7.53.1\"}, {\"status\": \"affected\", \"version\": \"7.53.0\"}, {\"status\": \"affected\", \"version\": \"7.52.1\"}, {\"status\": \"affected\", \"version\": \"7.52.0\"}, {\"status\": \"affected\", \"version\": \"7.51.0\"}, {\"status\": \"affected\", \"version\": \"7.50.3\"}, {\"status\": \"affected\", \"version\": \"7.50.2\"}, {\"status\": \"affected\", \"version\": \"7.50.1\"}, {\"status\": \"affected\", \"version\": \"7.50.0\"}, {\"status\": \"affected\", \"version\": \"7.49.1\"}, {\"status\": \"affected\", \"version\": \"7.49.0\"}, {\"status\": \"affected\", \"version\": \"7.48.0\"}, {\"status\": \"affected\", \"version\": \"7.47.1\"}, {\"status\": \"affected\", \"version\": \"7.47.0\"}, {\"status\": \"affected\", \"version\": \"7.46.0\"}, {\"status\": \"affected\", \"version\": \"7.45.0\"}, {\"status\": \"affected\", \"version\": \"7.44.0\"}, {\"status\": \"affected\", \"version\": \"7.43.0\"}, {\"status\": \"affected\", \"version\": \"7.42.1\"}, {\"status\": \"affected\", \"version\": \"7.42.0\"}, {\"status\": \"affected\", \"version\": \"7.41.0\"}, {\"status\": \"affected\", \"version\": \"7.40.0\"}, {\"status\": \"affected\", \"version\": \"7.39.0\"}, {\"status\": \"affected\", \"version\": \"7.38.0\"}, {\"status\": \"affected\", \"version\": \"7.37.1\"}, {\"status\": \"affected\", \"version\": \"7.37.0\"}, {\"status\": \"affected\", \"version\": \"7.36.0\"}, {\"status\": \"affected\", \"version\": \"7.35.0\"}, {\"status\": \"affected\", \"version\": \"7.34.0\"}, {\"status\": \"affected\", \"version\": \"7.33.0\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://curl.se/docs/CVE-2026-3783.json\"}, {\"url\": \"https://curl.se/docs/CVE-2026-3783.html\"}, {\"url\": \"https://hackerone.com/reports/3583983\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer\\nperforms a redirect to a second URL, curl could leak that token to the second\\nhostname under some circumstances.\\n\\nIf the hostname that the first request is redirected to has information in the\\nused .netrc file, with either of the `machine` or `default` keywords, curl\\nwould pass on the bearer token set for the first host also to the second one.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-522\", \"description\": \"Insufficiently Protected Credentials\"}]}], \"providerMetadata\": {\"orgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"shortName\": \"curl\", \"dateUpdated\": \"2026-09-15T06:02:52.569Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-3783\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-15T06:02:52.569Z\", \"dateReserved\": \"2026-03-08T05:09:09.891Z\", \"assignerOrgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"datePublished\": \"2026-03-11T10:09:08.746Z\", \"assignerShortName\": \"curl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


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.