ByteOS Network

CVE Vulnerability Details :

CVE-2026-6253

PUBLISHED

More Info Official Page

Assigner-curl

Assigner Org ID-2499f714-1537-4658-8207-48ae4bb9eae9

Published At-13 May, 2026 | 08:28

Updated At-13 May, 2026 | 17:42

▼CVE Numbering Authority (CNA)

proxy credentials leak over redirect-to proxy

curl might erroneously pass on credentials for a first proxy to a second proxy. This can happen when the following conditions are true: 1. curl is setup to use specific different proxies for different URL schemes 2. the first proxy needs credentials 3. the second proxy uses no credentials 4. while using the first proxy (using say `http://`), curl is asked to follow a redirect to a URL using another scheme (say `https://`), accessed using a second, different, proxy

Affected Products

Vendor

CURL

Product

curl

Default Status

unaffected

Versions

Affected

From 8.19.0 through 8.19.0 (semver)
From 8.18.0 through 8.18.0 (semver)
From 8.17.0 through 8.17.0 (semver)
From 8.16.0 through 8.16.0 (semver)
From 8.15.0 through 8.15.0 (semver)
From 8.14.1 through 8.14.1 (semver)
From 8.14.0 through 8.14.0 (semver)
From 8.13.0 through 8.13.0 (semver)
From 8.12.1 through 8.12.1 (semver)
From 8.12.0 through 8.12.0 (semver)
From 8.11.1 through 8.11.1 (semver)
From 8.11.0 through 8.11.0 (semver)
From 8.10.1 through 8.10.1 (semver)
From 8.10.0 through 8.10.0 (semver)
From 8.9.1 through 8.9.1 (semver)
From 8.9.0 through 8.9.0 (semver)
From 8.8.0 through 8.8.0 (semver)
From 8.7.1 through 8.7.1 (semver)
From 8.7.0 through 8.7.0 (semver)
From 8.6.0 through 8.6.0 (semver)
From 8.5.0 through 8.5.0 (semver)
From 8.4.0 through 8.4.0 (semver)
From 8.3.0 through 8.3.0 (semver)
From 8.2.1 through 8.2.1 (semver)
From 8.2.0 through 8.2.0 (semver)
From 8.1.2 through 8.1.2 (semver)
From 8.1.1 through 8.1.1 (semver)
From 8.1.0 through 8.1.0 (semver)
From 8.0.1 through 8.0.1 (semver)
From 8.0.0 through 8.0.0 (semver)
From 7.88.1 through 7.88.1 (semver)
From 7.88.0 through 7.88.0 (semver)
From 7.87.0 through 7.87.0 (semver)
From 7.86.0 through 7.86.0 (semver)
From 7.85.0 through 7.85.0 (semver)
From 7.84.0 through 7.84.0 (semver)
From 7.83.1 through 7.83.1 (semver)
From 7.83.0 through 7.83.0 (semver)
From 7.82.0 through 7.82.0 (semver)
From 7.81.0 through 7.81.0 (semver)
From 7.80.0 through 7.80.0 (semver)
From 7.79.1 through 7.79.1 (semver)
From 7.79.0 through 7.79.0 (semver)
From 7.78.0 through 7.78.0 (semver)
From 7.77.0 through 7.77.0 (semver)
From 7.76.1 through 7.76.1 (semver)
From 7.76.0 through 7.76.0 (semver)
From 7.75.0 through 7.75.0 (semver)
From 7.74.0 through 7.74.0 (semver)
From 7.73.0 through 7.73.0 (semver)
From 7.72.0 through 7.72.0 (semver)
From 7.71.1 through 7.71.1 (semver)
From 7.71.0 through 7.71.0 (semver)
From 7.70.0 through 7.70.0 (semver)
From 7.69.1 through 7.69.1 (semver)
From 7.69.0 through 7.69.0 (semver)
From 7.68.0 through 7.68.0 (semver)
From 7.67.0 through 7.67.0 (semver)
From 7.66.0 through 7.66.0 (semver)
From 7.65.3 through 7.65.3 (semver)
From 7.65.2 through 7.65.2 (semver)
From 7.65.1 through 7.65.1 (semver)
From 7.65.0 through 7.65.0 (semver)
From 7.64.1 through 7.64.1 (semver)
From 7.64.0 through 7.64.0 (semver)
From 7.63.0 through 7.63.0 (semver)
From 7.62.0 through 7.62.0 (semver)
From 7.61.1 through 7.61.1 (semver)
From 7.61.0 through 7.61.0 (semver)
From 7.60.0 through 7.60.0 (semver)
From 7.59.0 through 7.59.0 (semver)
From 7.58.0 through 7.58.0 (semver)
From 7.57.0 through 7.57.0 (semver)
From 7.56.1 through 7.56.1 (semver)
From 7.56.0 through 7.56.0 (semver)
From 7.55.1 through 7.55.1 (semver)
From 7.55.0 through 7.55.0 (semver)
From 7.54.1 through 7.54.1 (semver)
From 7.54.0 through 7.54.0 (semver)
From 7.53.1 through 7.53.1 (semver)
From 7.53.0 through 7.53.0 (semver)
From 7.52.1 through 7.52.1 (semver)
From 7.52.0 through 7.52.0 (semver)
From 7.51.0 through 7.51.0 (semver)
From 7.50.3 through 7.50.3 (semver)
From 7.50.2 through 7.50.2 (semver)
From 7.50.1 through 7.50.1 (semver)
From 7.50.0 through 7.50.0 (semver)
From 7.49.1 through 7.49.1 (semver)
From 7.49.0 through 7.49.0 (semver)
From 7.48.0 through 7.48.0 (semver)
From 7.47.1 through 7.47.1 (semver)
From 7.47.0 through 7.47.0 (semver)
From 7.46.0 through 7.46.0 (semver)
From 7.45.0 through 7.45.0 (semver)
From 7.44.0 through 7.44.0 (semver)
From 7.43.0 through 7.43.0 (semver)
From 7.42.1 through 7.42.1 (semver)
From 7.42.0 through 7.42.0 (semver)
From 7.41.0 through 7.41.0 (semver)
From 7.40.0 through 7.40.0 (semver)
From 7.39.0 through 7.39.0 (semver)
From 7.38.0 through 7.38.0 (semver)
From 7.37.1 through 7.37.1 (semver)
From 7.37.0 through 7.37.0 (semver)
From 7.36.0 through 7.36.0 (semver)
From 7.35.0 through 7.35.0 (semver)
From 7.34.0 through 7.34.0 (semver)
From 7.33.0 through 7.33.0 (semver)
From 7.32.0 through 7.32.0 (semver)
From 7.31.0 through 7.31.0 (semver)
From 7.30.0 through 7.30.0 (semver)
From 7.29.0 through 7.29.0 (semver)
From 7.28.1 through 7.28.1 (semver)
From 7.28.0 through 7.28.0 (semver)
From 7.27.0 through 7.27.0 (semver)
From 7.26.0 through 7.26.0 (semver)
From 7.25.0 through 7.25.0 (semver)
From 7.24.0 through 7.24.0 (semver)
From 7.23.1 through 7.23.1 (semver)
From 7.23.0 through 7.23.0 (semver)
From 7.22.0 through 7.22.0 (semver)
From 7.21.7 through 7.21.7 (semver)
From 7.21.6 through 7.21.6 (semver)
From 7.21.5 through 7.21.5 (semver)
From 7.21.4 through 7.21.4 (semver)
From 7.21.3 through 7.21.3 (semver)
From 7.21.2 through 7.21.2 (semver)
From 7.21.1 through 7.21.1 (semver)
From 7.21.0 through 7.21.0 (semver)
From 7.20.1 through 7.20.1 (semver)
From 7.20.0 through 7.20.0 (semver)
From 7.19.7 through 7.19.7 (semver)
From 7.19.6 through 7.19.6 (semver)
From 7.19.5 through 7.19.5 (semver)
From 7.19.4 through 7.19.4 (semver)
From 7.19.3 through 7.19.3 (semver)
From 7.19.2 through 7.19.2 (semver)
From 7.19.1 through 7.19.1 (semver)
From 7.19.0 through 7.19.0 (semver)
From 7.18.2 through 7.18.2 (semver)
From 7.18.1 through 7.18.1 (semver)
From 7.18.0 through 7.18.0 (semver)
From 7.17.1 through 7.17.1 (semver)
From 7.17.0 through 7.17.0 (semver)
From 7.16.4 through 7.16.4 (semver)
From 7.16.3 through 7.16.3 (semver)
From 7.16.2 through 7.16.2 (semver)
From 7.16.1 through 7.16.1 (semver)
From 7.16.0 through 7.16.0 (semver)
From 7.15.5 through 7.15.5 (semver)
From 7.15.4 through 7.15.4 (semver)
From 7.15.3 through 7.15.3 (semver)
From 7.15.2 through 7.15.2 (semver)
From 7.15.1 through 7.15.1 (semver)
From 7.15.0 through 7.15.0 (semver)
From 7.14.1 through 7.14.1 (semver)

Problem Types

Type	CWE ID	Description
N/A	N/A	CWE-522 Insufficiently Protected Credentials

Type: N/A

CWE ID: N/A

Description: CWE-522 Insufficiently Protected Credentials

Credits

finder

Dwij Mehta (O2 Lab

finder

Texas A&M University)

remediation developer

Daniel Stenberg

References

Hyperlink	Resource
https://curl.se/docs/CVE-2026-6253.json	N/A
https://curl.se/docs/CVE-2026-6253.html	N/A
https://hackerone.com/reports/3669637	N/A

Hyperlink: https://curl.se/docs/CVE-2026-6253.json

Resource: N/A

Hyperlink: https://curl.se/docs/CVE-2026-6253.html

Resource: N/A

Hyperlink: https://hackerone.com/reports/3669637

Resource: N/A

▼Authorized Data Publishers (ADP)

1. CVE Program Container

References

Hyperlink	Resource
http://www.openwall.com/lists/oss-security/2026/04/29/11	N/A

Hyperlink: http://www.openwall.com/lists/oss-security/2026/04/29/11

Resource: N/A

2. CISA ADP Vulnrichment

Metrics

Version	Base score	Base severity	Vector
3.1	5.9	MEDIUM	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Version: 3.1

Base score: 5.9

Base severity: MEDIUM

Vector:

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Metrics Other Info

References

Hyperlink	Resource
https://hackerone.com/reports/3669637	exploit

Hyperlink: https://hackerone.com/reports/3669637

Resource:

exploit

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Exploits

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Replaced By

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