Vulnerability-Lookup

FKIE_CVE-2026-4873

Vulnerability from fkie_nvd - Published: 2026-05-13 13:01 - Updated: 2026-06-17 10:57

Severity

5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

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.

References

URL	Tags
2499f714-1537-4658-8207-48ae4bb9eae9	https://curl.se/docs/CVE-2026-4873.html	Patch, Vendor Advisory
2499f714-1537-4658-8207-48ae4bb9eae9	https://curl.se/docs/CVE-2026-4873.json	Vendor Advisory
2499f714-1537-4658-8207-48ae4bb9eae9	https://hackerone.com/reports/3621851	Exploit, Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/04/29/7	Mailing List, Patch, Third Party Advisory

Impacted products

	Vendor	Product	Version
	haxx	curl	*

JSON

To clipboard

{
  "affected": [
    {
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          "product": "curl",
          "vendor": "curl",
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      "value": "A vulnerability exists where a connection requiring TLS incorrectly reuses an\nexisting unencrypted connection from the same connection pool. If an initial\ntransfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request\nto that same host bypasses the TLS requirement and instead transmit data\nunencrypted."
    }
  ],
  "id": "CVE-2026-4873",
  "lastModified": "2026-06-17T10:57:22.293",
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        "cvssData": {
          "attackComplexity": "HIGH",
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}

CVE-2026-4873 (GCVE-0-2026-4873)

Vulnerability from cvelistv5 – Published: 2026-05-13 08:27 – Updated: 2026-05-13 19:30

Title

connection reuse ignores TLS requirement

Summary

Severity

5.9 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-319 Cleartext Transmission of Sensitive Information
CWE-319 - Cleartext Transmission of Sensitive Information

Assigner

curl

References

4 references

URL	Tags
https://curl.se/docs/CVE-2026-4873.json
https://curl.se/docs/CVE-2026-4873.html
https://hackerone.com/reports/3621851
http://www.openwall.com/lists/oss-security/2026/04/29/7

Impacted products

1 product

Vendor	Product	Version
curl	curl	Affected: 8.19.0 , ≤ 8.19.0 (semver) Affected: 8.18.0 , ≤ 8.18.0 (semver) Affected: 8.17.0 , ≤ 8.17.0 (semver) Affected: 8.16.0 , ≤ 8.16.0 (semver) Affected: 8.15.0 , ≤ 8.15.0 (semver) Affected: 8.14.1 , ≤ 8.14.1 (semver) Affected: 8.14.0 , ≤ 8.14.0 (semver) Affected: 8.13.0 , ≤ 8.13.0 (semver) Affected: 8.12.1 , ≤ 8.12.1 (semver) Affected: 8.12.0 , ≤ 8.12.0 (semver) Affected: 8.11.1 , ≤ 8.11.1 (semver) Affected: 8.11.0 , ≤ 8.11.0 (semver) Affected: 8.10.1 , ≤ 8.10.1 (semver) Affected: 8.10.0 , ≤ 8.10.0 (semver) Affected: 8.9.1 , ≤ 8.9.1 (semver) Affected: 8.9.0 , ≤ 8.9.0 (semver) Affected: 8.8.0 , ≤ 8.8.0 (semver) Affected: 8.7.1 , ≤ 8.7.1 (semver) Affected: 8.7.0 , ≤ 8.7.0 (semver) Affected: 8.6.0 , ≤ 8.6.0 (semver) Affected: 8.5.0 , ≤ 8.5.0 (semver) Affected: 8.4.0 , ≤ 8.4.0 (semver) Affected: 8.3.0 , ≤ 8.3.0 (semver) Affected: 8.2.1 , ≤ 8.2.1 (semver) Affected: 8.2.0 , ≤ 8.2.0 (semver) Affected: 8.1.2 , ≤ 8.1.2 (semver) Affected: 8.1.1 , ≤ 8.1.1 (semver) Affected: 8.1.0 , ≤ 8.1.0 (semver) Affected: 8.0.1 , ≤ 8.0.1 (semver) Affected: 8.0.0 , ≤ 8.0.0 (semver) Affected: 7.88.1 , ≤ 7.88.1 (semver) Affected: 7.88.0 , ≤ 7.88.0 (semver) Affected: 7.87.0 , ≤ 7.87.0 (semver) Affected: 7.86.0 , ≤ 7.86.0 (semver) Affected: 7.85.0 , ≤ 7.85.0 (semver) Affected: 7.84.0 , ≤ 7.84.0 (semver) Affected: 7.83.1 , ≤ 7.83.1 (semver) Affected: 7.83.0 , ≤ 7.83.0 (semver) Affected: 7.82.0 , ≤ 7.82.0 (semver) Affected: 7.81.0 , ≤ 7.81.0 (semver) Affected: 7.80.0 , ≤ 7.80.0 (semver) Affected: 7.79.1 , ≤ 7.79.1 (semver) Affected: 7.79.0 , ≤ 7.79.0 (semver) Affected: 7.78.0 , ≤ 7.78.0 (semver) Affected: 7.77.0 , ≤ 7.77.0 (semver) Affected: 7.76.1 , ≤ 7.76.1 (semver) Affected: 7.76.0 , ≤ 7.76.0 (semver) Affected: 7.75.0 , ≤ 7.75.0 (semver) Affected: 7.74.0 , ≤ 7.74.0 (semver) Affected: 7.73.0 , ≤ 7.73.0 (semver) Affected: 7.72.0 , ≤ 7.72.0 (semver) Affected: 7.71.1 , ≤ 7.71.1 (semver) Affected: 7.71.0 , ≤ 7.71.0 (semver) Affected: 7.70.0 , ≤ 7.70.0 (semver) Affected: 7.69.1 , ≤ 7.69.1 (semver) Affected: 7.69.0 , ≤ 7.69.0 (semver) Affected: 7.68.0 , ≤ 7.68.0 (semver) Affected: 7.67.0 , ≤ 7.67.0 (semver) Affected: 7.66.0 , ≤ 7.66.0 (semver) Affected: 7.65.3 , ≤ 7.65.3 (semver) Affected: 7.65.2 , ≤ 7.65.2 (semver) Affected: 7.65.1 , ≤ 7.65.1 (semver) Affected: 7.65.0 , ≤ 7.65.0 (semver) Affected: 7.64.1 , ≤ 7.64.1 (semver) Affected: 7.64.0 , ≤ 7.64.0 (semver) Affected: 7.63.0 , ≤ 7.63.0 (semver) Affected: 7.62.0 , ≤ 7.62.0 (semver) Affected: 7.61.1 , ≤ 7.61.1 (semver) Affected: 7.61.0 , ≤ 7.61.0 (semver) Affected: 7.60.0 , ≤ 7.60.0 (semver) Affected: 7.59.0 , ≤ 7.59.0 (semver) Affected: 7.58.0 , ≤ 7.58.0 (semver) Affected: 7.57.0 , ≤ 7.57.0 (semver) Affected: 7.56.1 , ≤ 7.56.1 (semver) Affected: 7.56.0 , ≤ 7.56.0 (semver) Affected: 7.55.1 , ≤ 7.55.1 (semver) Affected: 7.55.0 , ≤ 7.55.0 (semver) Affected: 7.54.1 , ≤ 7.54.1 (semver) Affected: 7.54.0 , ≤ 7.54.0 (semver) Affected: 7.53.1 , ≤ 7.53.1 (semver) Affected: 7.53.0 , ≤ 7.53.0 (semver) Affected: 7.52.1 , ≤ 7.52.1 (semver) Affected: 7.52.0 , ≤ 7.52.0 (semver) Affected: 7.51.0 , ≤ 7.51.0 (semver) Affected: 7.50.3 , ≤ 7.50.3 (semver) Affected: 7.50.2 , ≤ 7.50.2 (semver) Affected: 7.50.1 , ≤ 7.50.1 (semver) Affected: 7.50.0 , ≤ 7.50.0 (semver) Affected: 7.49.1 , ≤ 7.49.1 (semver) Affected: 7.49.0 , ≤ 7.49.0 (semver) Affected: 7.48.0 , ≤ 7.48.0 (semver) Affected: 7.47.1 , ≤ 7.47.1 (semver) Affected: 7.47.0 , ≤ 7.47.0 (semver) Affected: 7.46.0 , ≤ 7.46.0 (semver) Affected: 7.45.0 , ≤ 7.45.0 (semver) Affected: 7.44.0 , ≤ 7.44.0 (semver) Affected: 7.43.0 , ≤ 7.43.0 (semver) Affected: 7.42.1 , ≤ 7.42.1 (semver) Affected: 7.42.0 , ≤ 7.42.0 (semver) Affected: 7.41.0 , ≤ 7.41.0 (semver) Affected: 7.40.0 , ≤ 7.40.0 (semver) Affected: 7.39.0 , ≤ 7.39.0 (semver) Affected: 7.38.0 , ≤ 7.38.0 (semver) Affected: 7.37.1 , ≤ 7.37.1 (semver) Affected: 7.37.0 , ≤ 7.37.0 (semver) Affected: 7.36.0 , ≤ 7.36.0 (semver) Affected: 7.35.0 , ≤ 7.35.0 (semver) Affected: 7.34.0 , ≤ 7.34.0 (semver) Affected: 7.33.0 , ≤ 7.33.0 (semver) Affected: 7.32.0 , ≤ 7.32.0 (semver) Affected: 7.31.0 , ≤ 7.31.0 (semver) Affected: 7.30.0 , ≤ 7.30.0 (semver) Affected: 7.29.0 , ≤ 7.29.0 (semver) Affected: 7.28.1 , ≤ 7.28.1 (semver) Affected: 7.28.0 , ≤ 7.28.0 (semver) Affected: 7.27.0 , ≤ 7.27.0 (semver) Affected: 7.26.0 , ≤ 7.26.0 (semver) Affected: 7.25.0 , ≤ 7.25.0 (semver) Affected: 7.24.0 , ≤ 7.24.0 (semver) Affected: 7.23.1 , ≤ 7.23.1 (semver) Affected: 7.23.0 , ≤ 7.23.0 (semver) Affected: 7.22.0 , ≤ 7.22.0 (semver) Affected: 7.21.7 , ≤ 7.21.7 (semver) Affected: 7.21.6 , ≤ 7.21.6 (semver) Affected: 7.21.5 , ≤ 7.21.5 (semver) Affected: 7.21.4 , ≤ 7.21.4 (semver) Affected: 7.21.3 , ≤ 7.21.3 (semver) Affected: 7.21.2 , ≤ 7.21.2 (semver) Affected: 7.21.1 , ≤ 7.21.1 (semver) Affected: 7.21.0 , ≤ 7.21.0 (semver) Affected: 7.20.1 , ≤ 7.20.1 (semver) Affected: 7.20.0 , ≤ 7.20.0 (semver)

Credits

Arkadi Vainbrand Daniel Stenberg

Show details on NVD website

JSON

To clipboard

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              "versionType": "semver"
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              "status": "affected",
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              "versionType": "semver"
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              "status": "affected",
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              "versionType": "semver"
            },
            {
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              "status": "affected",
              "version": "7.66.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.65.3",
              "status": "affected",
              "version": "7.65.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.65.2",
              "status": "affected",
              "version": "7.65.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.65.1",
              "status": "affected",
              "version": "7.65.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.65.0",
              "status": "affected",
              "version": "7.65.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.64.1",
              "status": "affected",
              "version": "7.64.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.64.0",
              "status": "affected",
              "version": "7.64.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.63.0",
              "status": "affected",
              "version": "7.63.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.62.0",
              "status": "affected",
              "version": "7.62.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.61.1",
              "status": "affected",
              "version": "7.61.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.61.0",
              "status": "affected",
              "version": "7.61.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.60.0",
              "status": "affected",
              "version": "7.60.0",
              "versionType": "semver"
            },
            {
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              "status": "affected",
              "version": "7.59.0",
              "versionType": "semver"
            },
            {
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              "status": "affected",
              "version": "7.58.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.57.0",
              "status": "affected",
              "version": "7.57.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.56.1",
              "status": "affected",
              "version": "7.56.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.56.0",
              "status": "affected",
              "version": "7.56.0",
              "versionType": "semver"
            },
            {
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              "status": "affected",
              "version": "7.55.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.55.0",
              "status": "affected",
              "version": "7.55.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.54.1",
              "status": "affected",
              "version": "7.54.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.54.0",
              "status": "affected",
              "version": "7.54.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.53.1",
              "status": "affected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.53.0",
              "status": "affected",
              "version": "7.53.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.52.1",
              "status": "affected",
              "version": "7.52.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.52.0",
              "status": "affected",
              "version": "7.52.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.51.0",
              "status": "affected",
              "version": "7.51.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.50.3",
              "status": "affected",
              "version": "7.50.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.50.2",
              "status": "affected",
              "version": "7.50.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.50.1",
              "status": "affected",
              "version": "7.50.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.50.0",
              "status": "affected",
              "version": "7.50.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.49.1",
              "status": "affected",
              "version": "7.49.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.49.0",
              "status": "affected",
              "version": "7.49.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.48.0",
              "status": "affected",
              "version": "7.48.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.47.1",
              "status": "affected",
              "version": "7.47.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.47.0",
              "status": "affected",
              "version": "7.47.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.46.0",
              "status": "affected",
              "version": "7.46.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.45.0",
              "status": "affected",
              "version": "7.45.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.44.0",
              "status": "affected",
              "version": "7.44.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.43.0",
              "status": "affected",
              "version": "7.43.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.42.1",
              "status": "affected",
              "version": "7.42.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.42.0",
              "status": "affected",
              "version": "7.42.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.41.0",
              "status": "affected",
              "version": "7.41.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.40.0",
              "status": "affected",
              "version": "7.40.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.39.0",
              "status": "affected",
              "version": "7.39.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.38.0",
              "status": "affected",
              "version": "7.38.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.37.1",
              "status": "affected",
              "version": "7.37.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.37.0",
              "status": "affected",
              "version": "7.37.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.36.0",
              "status": "affected",
              "version": "7.36.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.35.0",
              "status": "affected",
              "version": "7.35.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.34.0",
              "status": "affected",
              "version": "7.34.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.33.0",
              "status": "affected",
              "version": "7.33.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.32.0",
              "status": "affected",
              "version": "7.32.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.31.0",
              "status": "affected",
              "version": "7.31.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.30.0",
              "status": "affected",
              "version": "7.30.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.29.0",
              "status": "affected",
              "version": "7.29.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.28.1",
              "status": "affected",
              "version": "7.28.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.28.0",
              "status": "affected",
              "version": "7.28.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.27.0",
              "status": "affected",
              "version": "7.27.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.26.0",
              "status": "affected",
              "version": "7.26.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.25.0",
              "status": "affected",
              "version": "7.25.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.24.0",
              "status": "affected",
              "version": "7.24.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.23.1",
              "status": "affected",
              "version": "7.23.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.23.0",
              "status": "affected",
              "version": "7.23.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.22.0",
              "status": "affected",
              "version": "7.22.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.21.7",
              "status": "affected",
              "version": "7.21.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.21.6",
              "status": "affected",
              "version": "7.21.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.21.5",
              "status": "affected",
              "version": "7.21.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.21.4",
              "status": "affected",
              "version": "7.21.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.21.3",
              "status": "affected",
              "version": "7.21.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.21.2",
              "status": "affected",
              "version": "7.21.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.21.1",
              "status": "affected",
              "version": "7.21.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.21.0",
              "status": "affected",
              "version": "7.21.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.20.1",
              "status": "affected",
              "version": "7.20.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.20.0",
              "status": "affected",
              "version": "7.20.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Arkadi Vainbrand"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Daniel Stenberg"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability exists where a connection requiring TLS incorrectly reuses an\nexisting unencrypted connection from the same connection pool. If an initial\ntransfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request\nto that same host bypasses the TLS requirement and instead transmit data\nunencrypted."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-319 Cleartext Transmission of Sensitive Information",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-13T08:27:04.538Z",
        "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "shortName": "curl"
      },
      "references": [
        {
          "name": "json",
          "url": "https://curl.se/docs/CVE-2026-4873.json"
        },
        {
          "name": "www",
          "url": "https://curl.se/docs/CVE-2026-4873.html"
        },
        {
          "name": "issue",
          "url": "https://hackerone.com/reports/3621851"
        }
      ],
      "title": "connection reuse ignores TLS requirement"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
    "assignerShortName": "curl",
    "cveId": "CVE-2026-4873",
    "datePublished": "2026-05-13T08:27:04.538Z",
    "dateReserved": "2026-03-26T05:38:02.098Z",
    "dateUpdated": "2026-05-13T19:30:04.825Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-4873

CVE-2026-4873 (GCVE-0-2026-4873)

Tags

Sightings

Nomenclature