CVE-2026-107929

When `CURLOPT_INTERFACE` (or the command line tool's `--interface` option) is set with one of the documented prefixes (`if!`, `host!`, `ifhost!`), that binding is not part of the connection reuse key, so a later transfer asking for a different source can silently reuse an existing connection and go out from the earlier transfer's source address

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-2026-107929.html
https://curl.se/docs/CVE-2026-107929.json
https://hackerone.com/reports/4099618
https://hackerone.com/reports/4099618

Configurations

No configuration.

History

30 Oct 2026, 17:17

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 8.1
CWE		CWE-488
References	~~() https://hackerone.com/reports/4099618 -~~	() https://hackerone.com/reports/4099618 -

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-2026-107929

Mitre link : CVE-2026-107929

CVE.ORG link : CVE-2026-107929

JSON object : View

Products Affected

No product.

CWE

CWE-488

Exposure of Data Element to Wrong Session

{"id": "CVE-2026-107929", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-107929", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-10-30T16:30:50.273989Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.2}]}, "affected": [{"source": "2499f714-1537-4658-8207-48ae4bb9eae9", "affectedData": [{"vendor": "curl", "product": "curl", "versions": [{"status": "affected", "version": "8.22.0", "versionType": "semver", "lessThanOrEqual": "8.22.0"}, {"status": "affected", "version": "8.21.0", "versionType": "semver", "lessThanOrEqual": "8.21.0"}, {"status": "affected", "version": "8.20.0", "versionType": "semver", "lessThanOrEqual": "8.20.0"}, {"status": "affected", "version": "8.19.0", "versionType": "semver", "lessThanOrEqual": "8.19.0"}, {"status": "affected", "version": "8.18.0", "versionType": "semver", "lessThanOrEqual": "8.18.0"}, {"status": "affected", "version": "8.17.0", "versionType": "semver", "lessThanOrEqual": "8.17.0"}, {"status": "affected", "version": "8.16.0", "versionType": "semver", "lessThanOrEqual": "8.16.0"}, {"status": "affected", "version": "8.15.0", "versionType": "semver", "lessThanOrEqual": "8.15.0"}, {"status": "affected", "version": "8.14.1", "versionType": "semver", "lessThanOrEqual": "8.14.1"}, {"status": "affected", "version": "8.14.0", "versionType": "semver", "lessThanOrEqual": "8.14.0"}, {"status": "affected", "version": "8.13.0", "versionType": "semver", "lessThanOrEqual": "8.13.0"}, {"status": "affected", "version": "8.12.1", "versionType": "semver", "lessThanOrEqual": "8.12.1"}, {"status": "affected", "version": "8.12.0", "versionType": "semver", "lessThanOrEqual": "8.12.0"}, {"status": "affected", "version": "8.11.1", "versionType": "semver", "lessThanOrEqual": "8.11.1"}, {"status": "affected", "version": "8.11.0", "versionType": "semver", "lessThanOrEqual": "8.11.0"}, {"status": "affected", "version": "8.10.1", "versionType": "semver", "lessThanOrEqual": "8.10.1"}, {"status": "affected", "version": "8.10.0", "versionType": "semver", "lessThanOrEqual": "8.10.0"}, {"status": "affected", "version": "8.9.1", "versionType": "semver", "lessThanOrEqual": "8.9.1"}, {"status": "affected", "version": "8.9.0", "versionType": "semver", "lessThanOrEqual": "8.9.0"}], "defaultStatus": "unaffected"}]}], "published": "2026-10-20T21:17:15.593", "references": [{"url": "https://curl.se/docs/CVE-2026-107929.html", "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://curl.se/docs/CVE-2026-107929.json", "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://hackerone.com/reports/4099618", "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://hackerone.com/reports/4099618", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-488"}]}], "descriptions": [{"lang": "en", "value": "When `CURLOPT_INTERFACE` (or the command line tool's `--interface` option) is\nset with one of the documented prefixes (`if!`, `host!`, `ifhost!`), that\nbinding is not part of the connection reuse key, so a later transfer asking\nfor a different source can silently reuse an existing connection and go out\nfrom the earlier transfer's source address"}], "lastModified": "2026-10-30T17:17:12.723", "sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9"}