CVE-2026-92389

libcurl's TFTP state machine fails to validate state transitions against the requested transfer direction, accepting opening server responses for both reads and writes interchangeably. A malicious TFTP server can respond to a download request in a way that forces the client into transmit mode, prompting libcurl to consume and transmit data from the handle's persistent `CURLOPT_READDATA` pointer - including data remaining from unrelated prior operations, such as an HTTP POST request executed on a reused handle.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://curl.se/docs/CVE-2026-92389.html
https://curl.se/docs/CVE-2026-92389.json
https://hackerone.com/reports/4022568
https://hackerone.com/reports/4022568

Configurations

No configuration.

History

30 Oct 2026, 13:20

Type	Values Removed	Values Added
CWE		CWE-200
References	~~() https://hackerone.com/reports/4022568 -~~	() https://hackerone.com/reports/4022568 -
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 8.1

20 Oct 2026, 21:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-20 21:17

Updated : 2026-10-30 13:20

NVD link : CVE-2026-92389

Mitre link : CVE-2026-92389

CVE.ORG link : CVE-2026-92389

JSON object : View

Products Affected

No product.

CWE

CWE-200

Exposure of Sensitive Information to an Unauthorized Actor

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"lessThanOrEqual": "7.16.2"}, {"status": "affected", "version": "7.16.1", "versionType": "semver", "lessThanOrEqual": "7.16.1"}, {"status": "affected", "version": "7.16.0", "versionType": "semver", "lessThanOrEqual": "7.16.0"}, {"status": "affected", "version": "7.15.5", "versionType": "semver", "lessThanOrEqual": "7.15.5"}, {"status": "affected", "version": "7.15.4", "versionType": "semver", "lessThanOrEqual": "7.15.4"}, {"status": "affected", "version": "7.15.3", "versionType": "semver", "lessThanOrEqual": "7.15.3"}, {"status": "affected", "version": "7.15.2", "versionType": "semver", "lessThanOrEqual": "7.15.2"}, {"status": "affected", "version": "7.15.1", "versionType": "semver", "lessThanOrEqual": "7.15.1"}, {"status": "affected", "version": "7.15.0", "versionType": "semver", "lessThanOrEqual": "7.15.0"}], "defaultStatus": "unaffected"}]}], "published": "2026-10-20T21:17:21.457", "references": [{"url": "https://curl.se/docs/CVE-2026-92389.html", "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://curl.se/docs/CVE-2026-92389.json", "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://hackerone.com/reports/4022568", "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://hackerone.com/reports/4022568", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-200"}]}], "descriptions": [{"lang": "en", "value": "libcurl's TFTP state machine fails to validate state transitions against the\nrequested transfer direction, accepting opening server responses for both\nreads and writes interchangeably. A malicious TFTP server can respond to a\ndownload request in a way that forces the client into transmit mode, prompting\nlibcurl to consume and transmit data from the handle's persistent\n`CURLOPT_READDATA` pointer - including data remaining from unrelated prior\noperations, such as an HTTP POST request executed on a reused handle."}], "lastModified": "2026-10-30T13:20:53.970", "sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9"}