UBUNTU-CVE-2026-4873

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Source

https://ubuntu.com/security/CVE-2026-4873

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4873.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-4873

Upstream

CVE-2026-4873

Published

2026-04-29T14:00:00Z

Modified

2026-04-30T10:08:09.916584Z

Severity

Ubuntu - low

Summary

[none]

Details

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 will bypass the TLS requirement and instead transmit data unencrypted.

References

Affected packages

Ubuntu:22.04:LTS

curl

Package

Name: curl
Purl: pkg:deb/ubuntu/curl@7.81.0-1ubuntu1.23?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

7.*

7.74.0-1.3ubuntu2

7.74.0-1.3ubuntu3

7.80.0-3

7.81.0-1

7.81.0-1ubuntu1.1

7.81.0-1ubuntu1.2

7.81.0-1ubuntu1.3

7.81.0-1ubuntu1.4

7.81.0-1ubuntu1.6

7.81.0-1ubuntu1.7

7.81.0-1ubuntu1.8

7.81.0-1ubuntu1.10

7.81.0-1ubuntu1.11

7.81.0-1ubuntu1.13

7.81.0-1ubuntu1.14

7.81.0-1ubuntu1.15

7.81.0-1ubuntu1.16

7.81.0-1ubuntu1.17

7.81.0-1ubuntu1.18

7.81.0-1ubuntu1.19

7.81.0-1ubuntu1.20

7.81.0-1ubuntu1.21

7.81.0-1ubuntu1.22

7.81.0-1ubuntu1.23

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "7.81.0-1ubuntu1.23",
            "binary_name": "curl"
        },
        {
            "binary_version": "7.81.0-1ubuntu1.23",
            "binary_name": "libcurl3-gnutls"
        },
        {
            "binary_version": "7.81.0-1ubuntu1.23",
            "binary_name": "libcurl3-nss"
        },
        {
            "binary_version": "7.81.0-1ubuntu1.23",
            "binary_name": "libcurl4"
        }
    ],
    "priority_reason": "This flaw requires a rather special series of events to trigger. Such a series is unlikely to be used much in the wild."
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4873.json"

Ubuntu:24.04:LTS

curl

Package

Name: curl
Purl: pkg:deb/ubuntu/curl@8.5.0-2ubuntu10.8?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

8.*

8.2.1-1ubuntu3

8.2.1-1ubuntu3.1

8.4.0-2ubuntu1

8.5.0-2ubuntu1

8.5.0-2ubuntu2

8.5.0-2ubuntu8

8.5.0-2ubuntu9

8.5.0-2ubuntu10

8.5.0-2ubuntu10.1

8.5.0-2ubuntu10.2

8.5.0-2ubuntu10.3

8.5.0-2ubuntu10.4

8.5.0-2ubuntu10.5

8.5.0-2ubuntu10.6

8.5.0-2ubuntu10.7

8.5.0-2ubuntu10.8

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "8.5.0-2ubuntu10.8",
            "binary_name": "curl"
        },
        {
            "binary_version": "8.5.0-2ubuntu10.8",
            "binary_name": "libcurl3t64-gnutls"
        },
        {
            "binary_version": "8.5.0-2ubuntu10.8",
            "binary_name": "libcurl4t64"
        }
    ],
    "priority_reason": "This flaw requires a rather special series of events to trigger. Such a series is unlikely to be used much in the wild."
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4873.json"

Ubuntu:25.10

curl

Package

Name: curl
Purl: pkg:deb/ubuntu/curl@8.14.1-2ubuntu1.2?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

8.*

8.12.1-3ubuntu1

8.13.0-5ubuntu1

8.14.1-1ubuntu2

8.14.1-1ubuntu3

8.14.1-2ubuntu1

8.14.1-2ubuntu1.1

8.14.1-2ubuntu1.2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "8.14.1-2ubuntu1.2",
            "binary_name": "curl"
        },
        {
            "binary_version": "8.14.1-2ubuntu1.2",
            "binary_name": "libcurl3t64-gnutls"
        },
        {
            "binary_version": "8.14.1-2ubuntu1.2",
            "binary_name": "libcurl4t64"
        }
    ],
    "priority_reason": "This flaw requires a rather special series of events to trigger. Such a series is unlikely to be used much in the wild."
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4873.json"

Ubuntu:26.04

curl

Package

Name: curl
Purl: pkg:deb/ubuntu/curl@8.18.0-1ubuntu2?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

8.*

8.14.1-2ubuntu1

8.17.0-1ubuntu1

8.18.0-1ubuntu1

8.18.0-1ubuntu2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "8.18.0-1ubuntu2",
            "binary_name": "curl"
        },
        {
            "binary_version": "8.18.0-1ubuntu2",
            "binary_name": "libcurl3t64-gnutls"
        },
        {
            "binary_version": "8.18.0-1ubuntu2",
            "binary_name": "libcurl4t64"
        }
    ],
    "priority_reason": "This flaw requires a rather special series of events to trigger. Such a series is unlikely to be used much in the wild."
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4873.json"

Ubuntu:Pro:14.04:LTS

curl

Package

Name: curl
Purl: pkg:deb/ubuntu/curl@7.35.0-1ubuntu2.20+esm19?arch=source&distro=esm-infra-legacy/trusty

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

7.*

7.32.0-1ubuntu1

7.33.0-1ubuntu1

7.34.0-1ubuntu1

7.35.0-1ubuntu1

7.35.0-1ubuntu2

7.35.0-1ubuntu2.1

7.35.0-1ubuntu2.2

7.35.0-1ubuntu2.3

7.35.0-1ubuntu2.5

7.35.0-1ubuntu2.6

7.35.0-1ubuntu2.7

7.35.0-1ubuntu2.8

7.35.0-1ubuntu2.9

7.35.0-1ubuntu2.10

7.35.0-1ubuntu2.11

7.35.0-1ubuntu2.12

7.35.0-1ubuntu2.13

7.35.0-1ubuntu2.14

7.35.0-1ubuntu2.15

7.35.0-1ubuntu2.16

7.35.0-1ubuntu2.17

7.35.0-1ubuntu2.19

7.35.0-1ubuntu2.20

7.35.0-1ubuntu2.20+esm2

7.35.0-1ubuntu2.20+esm3

7.35.0-1ubuntu2.20+esm4

7.35.0-1ubuntu2.20+esm5

7.35.0-1ubuntu2.20+esm6

7.35.0-1ubuntu2.20+esm7

7.35.0-1ubuntu2.20+esm8

7.35.0-1ubuntu2.20+esm9

7.35.0-1ubuntu2.20+esm10

7.35.0-1ubuntu2.20+esm11

7.35.0-1ubuntu2.20+esm12

7.35.0-1ubuntu2.20+esm13

7.35.0-1ubuntu2.20+esm14

7.35.0-1ubuntu2.20+esm15

7.35.0-1ubuntu2.20+esm16

7.35.0-1ubuntu2.20+esm17

7.35.0-1ubuntu2.20+esm18

7.35.0-1ubuntu2.20+esm19

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "7.35.0-1ubuntu2.20+esm19",
            "binary_name": "curl"
        },
        {
            "binary_version": "7.35.0-1ubuntu2.20+esm19",
            "binary_name": "libcurl3"
        },
        {
            "binary_version": "7.35.0-1ubuntu2.20+esm19",
            "binary_name": "libcurl3-gnutls"
        },
        {
            "binary_version": "7.35.0-1ubuntu2.20+esm19",
            "binary_name": "libcurl3-nss"
        }
    ],
    "priority_reason": "This flaw requires a rather special series of events to trigger. Such a series is unlikely to be used much in the wild."
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4873.json"

Ubuntu:Pro:16.04:LTS

curl

Package

Name: curl
Purl: pkg:deb/ubuntu/curl@7.47.0-1ubuntu2.19+esm15?arch=source&distro=esm-infra/xenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

7.*

7.43.0-1ubuntu2

7.45.0-1ubuntu1

7.46.0-1ubuntu1

7.47.0-1ubuntu1

7.47.0-1ubuntu2

7.47.0-1ubuntu2.1

7.47.0-1ubuntu2.2

7.47.0-1ubuntu2.3

7.47.0-1ubuntu2.4

7.47.0-1ubuntu2.5

7.47.0-1ubuntu2.6

7.47.0-1ubuntu2.7

7.47.0-1ubuntu2.8

7.47.0-1ubuntu2.9

7.47.0-1ubuntu2.11

7.47.0-1ubuntu2.12

7.47.0-1ubuntu2.13

7.47.0-1ubuntu2.14

7.47.0-1ubuntu2.15

7.47.0-1ubuntu2.16

7.47.0-1ubuntu2.18

7.47.0-1ubuntu2.19

7.47.0-1ubuntu2.19+esm1

7.47.0-1ubuntu2.19+esm2

7.47.0-1ubuntu2.19+esm3

7.47.0-1ubuntu2.19+esm4

7.47.0-1ubuntu2.19+esm5

7.47.0-1ubuntu2.19+esm6

7.47.0-1ubuntu2.19+esm7

7.47.0-1ubuntu2.19+esm8

7.47.0-1ubuntu2.19+esm9

7.47.0-1ubuntu2.19+esm10

7.47.0-1ubuntu2.19+esm11

7.47.0-1ubuntu2.19+esm12

7.47.0-1ubuntu2.19+esm13

7.47.0-1ubuntu2.19+esm15

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "7.47.0-1ubuntu2.19+esm15",
            "binary_name": "curl"
        },
        {
            "binary_version": "7.47.0-1ubuntu2.19+esm15",
            "binary_name": "libcurl3"
        },
        {
            "binary_version": "7.47.0-1ubuntu2.19+esm15",
            "binary_name": "libcurl3-gnutls"
        },
        {
            "binary_version": "7.47.0-1ubuntu2.19+esm15",
            "binary_name": "libcurl3-nss"
        }
    ],
    "priority_reason": "This flaw requires a rather special series of events to trigger. Such a series is unlikely to be used much in the wild."
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4873.json"

Ubuntu:Pro:18.04:LTS

curl

Package

Name: curl
Purl: pkg:deb/ubuntu/curl@7.58.0-2ubuntu3.24+esm8?arch=source&distro=esm-infra/bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

7.*

7.55.1-1ubuntu2

7.55.1-1ubuntu2.1

7.57.0-1ubuntu1

7.58.0-2ubuntu1

7.58.0-2ubuntu2

7.58.0-2ubuntu3

7.58.0-2ubuntu3.1

7.58.0-2ubuntu3.2

7.58.0-2ubuntu3.3

7.58.0-2ubuntu3.5

7.58.0-2ubuntu3.6

7.58.0-2ubuntu3.7

7.58.0-2ubuntu3.8

7.58.0-2ubuntu3.9

7.58.0-2ubuntu3.10

7.58.0-2ubuntu3.12

7.58.0-2ubuntu3.13

7.58.0-2ubuntu3.14

7.58.0-2ubuntu3.15

7.58.0-2ubuntu3.16

7.58.0-2ubuntu3.17

7.58.0-2ubuntu3.18

7.58.0-2ubuntu3.19

7.58.0-2ubuntu3.20

7.58.0-2ubuntu3.21

7.58.0-2ubuntu3.22

7.58.0-2ubuntu3.23

7.58.0-2ubuntu3.24

7.58.0-2ubuntu3.24+esm1

7.58.0-2ubuntu3.24+esm2

7.58.0-2ubuntu3.24+esm3

7.58.0-2ubuntu3.24+esm4

7.58.0-2ubuntu3.24+esm5

7.58.0-2ubuntu3.24+esm7

7.58.0-2ubuntu3.24+esm8

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "7.58.0-2ubuntu3.24+esm8",
            "binary_name": "curl"
        },
        {
            "binary_version": "7.58.0-2ubuntu3.24+esm8",
            "binary_name": "libcurl3-gnutls"
        },
        {
            "binary_version": "7.58.0-2ubuntu3.24+esm8",
            "binary_name": "libcurl3-nss"
        },
        {
            "binary_version": "7.58.0-2ubuntu3.24+esm8",
            "binary_name": "libcurl4"
        }
    ],
    "priority_reason": "This flaw requires a rather special series of events to trigger. Such a series is unlikely to be used much in the wild."
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4873.json"

Ubuntu:Pro:20.04:LTS

curl

Package

Name: curl
Purl: pkg:deb/ubuntu/curl@7.68.0-1ubuntu2.25+esm3?arch=source&distro=esm-infra/focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

7.*

7.65.3-1ubuntu3

7.65.3-1ubuntu4

7.66.0-1ubuntu1

7.67.0-2ubuntu1

7.68.0-1ubuntu1

7.68.0-1ubuntu2

7.68.0-1ubuntu2.1

7.68.0-1ubuntu2.2

7.68.0-1ubuntu2.4

7.68.0-1ubuntu2.5

7.68.0-1ubuntu2.6

7.68.0-1ubuntu2.7

7.68.0-1ubuntu2.10

7.68.0-1ubuntu2.11

7.68.0-1ubuntu2.12

7.68.0-1ubuntu2.13

7.68.0-1ubuntu2.14

7.68.0-1ubuntu2.15

7.68.0-1ubuntu2.16

7.68.0-1ubuntu2.18

7.68.0-1ubuntu2.19

7.68.0-1ubuntu2.20

7.68.0-1ubuntu2.21

7.68.0-1ubuntu2.22

7.68.0-1ubuntu2.23

7.68.0-1ubuntu2.24

7.68.0-1ubuntu2.25

7.68.0-1ubuntu2.25+esm2

7.68.0-1ubuntu2.25+esm3

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "7.68.0-1ubuntu2.25+esm3",
            "binary_name": "curl"
        },
        {
            "binary_version": "7.68.0-1ubuntu2.25+esm3",
            "binary_name": "libcurl3-gnutls"
        },
        {
            "binary_version": "7.68.0-1ubuntu2.25+esm3",
            "binary_name": "libcurl3-nss"
        },
        {
            "binary_version": "7.68.0-1ubuntu2.25+esm3",
            "binary_name": "libcurl4"
        }
    ],
    "priority_reason": "This flaw requires a rather special series of events to trigger. Such a series is unlikely to be used much in the wild."
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4873.json"