ByteOS Network

CVE Vulnerability Details :

CVE-2026-4873

PUBLISHED

More Info Official Page

Assigner-curl

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

Published At-13 May, 2026 | 08:27

Updated At-13 May, 2026 | 19:30

▼CVE Numbering Authority (CNA)

connection reuse ignores TLS requirement

A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If an initial transfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request to that same host bypasses the TLS requirement and instead transmit data unencrypted.

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)

Problem Types

Type	CWE ID	Description
N/A	N/A	CWE-319 Cleartext Transmission of Sensitive Information

Type: N/A

CWE ID: N/A

Description: CWE-319 Cleartext Transmission of Sensitive Information

Credits

finder

Arkadi Vainbrand

remediation developer

Daniel Stenberg

References

Hyperlink	Resource
https://curl.se/docs/CVE-2026-4873.json	N/A
https://curl.se/docs/CVE-2026-4873.html	N/A
https://hackerone.com/reports/3621851	N/A

Hyperlink: https://curl.se/docs/CVE-2026-4873.json

Resource: N/A

Hyperlink: https://curl.se/docs/CVE-2026-4873.html

Resource: N/A

Hyperlink: https://hackerone.com/reports/3621851

Resource: N/A

▼Authorized Data Publishers (ADP)

1. CVE Program Container

References

Hyperlink	Resource
http://www.openwall.com/lists/oss-security/2026/04/29/7	N/A

Hyperlink: http://www.openwall.com/lists/oss-security/2026/04/29/7

Resource: N/A

2. CISA ADP Vulnrichment

Problem Types

Type	CWE ID	Description
CWE	CWE-319	CWE-319 Cleartext Transmission of Sensitive Information

Type: CWE

CWE ID: CWE-319

Description: CWE-319 Cleartext Transmission of Sensitive Information

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:H/I:N/A:N

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:H/I:N/A:N

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Affected

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Replaced By

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Replaced By

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