CVE-2026-7168

Successfully using libcurl to do a transfer over a specific HTTP proxy (`proxyA`) with **Digest** authentication and then changing the proxy host to a second one (`proxyB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Proxy-Authorization:` header field meant for `proxyA`, to `proxyB`.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://curl.se/docs/CVE-2026-7168.html	Patch Vendor Advisory
https://curl.se/docs/CVE-2026-7168.json	Vendor Advisory
https://hackerone.com/reports/3697719	Exploit Issue Tracking
http://www.openwall.com/lists/oss-security/2026/04/29/14	Mailing List Patch
https://hackerone.com/reports/3697719	Exploit Issue Tracking

Configurations

Configuration 1 (hide)

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

History

14 May 2026, 14:12

Type	Values Removed	Values Added
First Time		Haxx Haxx curl
CWE		CWE-294
CPE		cpe:2.3:a:haxx:curl::::::::
References	~~() https://curl.se/docs/CVE-2026-7168.html -~~	() https://curl.se/docs/CVE-2026-7168.html - Patch, Vendor Advisory
References	~~() https://curl.se/docs/CVE-2026-7168.json -~~	() https://curl.se/docs/CVE-2026-7168.json - Vendor Advisory
References	~~() https://hackerone.com/reports/3697719 -~~	() https://hackerone.com/reports/3697719 - Exploit, Issue Tracking
References	~~() http://www.openwall.com/lists/oss-security/2026/04/29/14 -~~	() http://www.openwall.com/lists/oss-security/2026/04/29/14 - Mailing List, Patch

13 May 2026, 16:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-13 13:01

Updated : 2026-05-14 14:12

NVD link : CVE-2026-7168

Mitre link : CVE-2026-7168

CVE.ORG link : CVE-2026-7168

JSON object : View

Products Affected

haxx

curl

CWE

CWE-294

Authentication Bypass by Capture-replay

{"id": "CVE-2026-7168", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 3.9}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "published": "2026-05-13T13:01:57.200", "references": [{"url": "https://curl.se/docs/CVE-2026-7168.html", "tags": ["Patch", "Vendor Advisory"], "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://curl.se/docs/CVE-2026-7168.json", "tags": ["Vendor Advisory"], "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://hackerone.com/reports/3697719", "tags": ["Exploit", "Issue Tracking"], "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "http://www.openwall.com/lists/oss-security/2026/04/29/14", "tags": ["Mailing List", "Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://hackerone.com/reports/3697719", "tags": ["Exploit", "Issue Tracking"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-294"}]}], "descriptions": [{"lang": "en", "value": "Successfully using libcurl to do a transfer over a specific HTTP proxy\n(`proxyA`) with **Digest** authentication and then changing the proxy host to\na second one (`proxyB`) for a second transfer, reusing the same handle, makes\nlibcurl wrongly pass on the `Proxy-Authorization:` header field meant for\n`proxyA`, to `proxyB`."}], "lastModified": "2026-05-14T14:12:48.457", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "29BC733F-6C8A-471C-BAAC-81727A2B0A19", "versionEndExcluding": "8.20.0", "versionStartIncluding": "7.12.0"}], "operator": "OR"}]}], "sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9"}