CVE-2026-107928

When curl is built with GnuTLS, a malicious WebSocket server can make curl send memory past its send buffer. This is due to an out of bounds read following when `gnutls_record_send()` returns a number of bytes sent **greater than the number of bytes it was given to send**. GnuTLS does that after a blocked send.

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-2026-107928.html
https://curl.se/docs/CVE-2026-107928.json
https://hackerone.com/reports/4099194
https://hackerone.com/reports/4099194

Configurations

No configuration.

History

30 Oct 2026, 17:17

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 8.1
References	~~() https://hackerone.com/reports/4099194 -~~	() https://hackerone.com/reports/4099194 -
CWE		CWE-126

20 Oct 2026, 21:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-20 21:17

Updated : 2026-10-30 17:17

NVD link : CVE-2026-107928

Mitre link : CVE-2026-107928

CVE.ORG link : CVE-2026-107928

JSON object : View

Products Affected

No product.

CWE

CWE-126

Buffer Over-read

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"lessThanOrEqual": "8.1.0"}, {"status": "affected", "version": "8.0.1", "versionType": "semver", "lessThanOrEqual": "8.0.1"}, {"status": "affected", "version": "8.0.0", "versionType": "semver", "lessThanOrEqual": "8.0.0"}, {"status": "affected", "version": "7.88.1", "versionType": "semver", "lessThanOrEqual": "7.88.1"}, {"status": "affected", "version": "7.88.0", "versionType": "semver", "lessThanOrEqual": "7.88.0"}, {"status": "affected", "version": "7.87.0", "versionType": "semver", "lessThanOrEqual": "7.87.0"}, {"status": "affected", "version": "7.86.0", "versionType": "semver", "lessThanOrEqual": "7.86.0"}], "defaultStatus": "unaffected"}]}], "published": "2026-10-20T21:17:15.470", "references": [{"url": "https://curl.se/docs/CVE-2026-107928.html", "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://curl.se/docs/CVE-2026-107928.json", "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://hackerone.com/reports/4099194", "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://hackerone.com/reports/4099194", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-126"}]}], "descriptions": [{"lang": "en", "value": "When curl is built with GnuTLS, a malicious WebSocket server can make curl\nsend memory past its send buffer. This is due to an out of bounds read\nfollowing when `gnutls_record_send()` returns a number of bytes sent **greater\nthan the number of bytes it was given to send**. GnuTLS does that after a\nblocked send."}], "lastModified": "2026-10-30T17:17:12.533", "sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9"}