DEBIAN-CVE-2026-1965

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Source

https://security-tracker.debian.org/tracker/CVE-2026-1965

Import Source

https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-1965.json

JSON Data

https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-1965

Upstream

CVE-2026-1965

Published

2026-03-11T11:15:59.177Z

Modified

2026-03-13T20:03:55.788658Z

Severity

6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N CVSS Calculator

Summary

[none]

Details

libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criterion must first be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials. One underlying reason being that Negotiate sometimes authenticates connections and not requests, contrary to how HTTP is designed to work. An application that allows Negotiate authentication to a server (that responds wanting Negotiate) with user1:password1 and then does another operation to the same server also using Negotiate but with user2:password2 (while the previous connection is still alive) - the second request wrongly reused the same connection and since it then sees that the Negotiate negotiation is already made, it just sends the request over that connection thinking it uses the user2 credentials when it is in fact still using the connection authenticated for user1... The set of authentication methods to use is set with CURLOPT_HTTPAUTH. Applications can disable libcurl's reuse of connections and thus mitigate this problem, by using one of the following libcurl options to alter how connections are or are not reused: CURLOPT_FRESH_CONNECT, CURLOPT_MAXCONNECTS and CURLMOPT_MAX_HOST_CONNECTIONS (if using the curl_multi API).

References

https://security-tracker.debian.org/tracker/CVE-2026-1965

Affected packages

Debian:11 / curl

Package

Name: curl
Purl: pkg:deb/debian/curl?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

7.*

7.74.0-1.3

7.74.0-1.3+deb11u1

7.74.0-1.3+deb11u2

7.74.0-1.3+deb11u3

7.74.0-1.3+deb11u4

7.74.0-1.3+deb11u5

7.74.0-1.3+deb11u6

7.74.0-1.3+deb11u7~bpo11+1

7.74.0-1.3+deb11u7

7.74.0-1.3+deb11u8

7.74.0-1.3+deb11u9

7.74.0-1.3+deb11u10

7.74.0-1.3+deb11u11

7.74.0-1.3+deb11u12

7.74.0-1.3+deb11u13

7.74.0-1.3+deb11u14

7.74.0-1.3+deb11u15

7.74.0-1.3+deb11u16

7.79.1-1

7.79.1-2

7.79.1-3~exp1

7.79.1-3~exp2

7.80.0-1

7.80.0-2

7.80.0-3

7.81.0-1~bpo11+1

7.81.0-1

7.82.0-1

7.82.0-2~bpo11+1

7.82.0-2

7.83.0-1

7.83.1-1

7.83.1-2

7.84.0-1

7.84.0-2~bpo11+1

7.84.0-2

7.85.0-1~bpo11+1

7.85.0-1

7.86.0-1

7.86.0-2

7.86.0-3

7.87.0-1~bpo11+1

7.87.0-1

7.87.0-2~bpo11+1

7.87.0-2

7.88.1-1~bpo11+1

7.88.1-1

7.88.1-2~exp1

7.88.1-2~exp2

7.88.1-2~exp3

7.88.1-2~exp4

7.88.1-2

7.88.1-3

7.88.1-4

7.88.1-5

7.88.1-6

7.88.1-7~bpo11+1

7.88.1-7~bpo11+2

7.88.1-7~exp1

7.88.1-7

7.88.1-8~exp1

7.88.1-8

7.88.1-9

7.88.1-10

7.88.1-11

8.*

8.0.1-1~exp1

8.2.1-1

8.2.1-2~bpo12+1

8.2.1-2

8.3.0-1

8.3.0-2~bpo12+1

8.3.0-2~exp1

8.3.0-2

8.3.0-3

8.4.0-1

8.4.0-2~bpo12+1

8.4.0-2

8.5.0-1

8.5.0-1+exp1

8.5.0-2~bpo12+1

8.5.0-2

8.5.0-2+exp1

8.6.0-1

8.6.0-1.1

8.6.0-2

8.6.0-3

8.6.0-3.1~exp1

8.6.0-3.1~exp2

8.6.0-3.1

8.6.0-3.2

8.6.0-4

8.7.1-1

8.7.1-1+exp1

8.7.1-2

8.7.1-3

8.7.1-4

8.7.1-5~bpo12+1

8.7.1-5

8.7.1-5+exp1

8.8.0-1~bpo12+1

8.8.0-1

8.8.0-1+exp1

8.8.0-1+exp2

8.8.0-2

8.8.0-3

8.8.0-4

8.9.0-1

8.9.0-2

8.9.0-3

8.9.1-1

8.9.1-2~bpo12+1

8.9.1-2

8.10.0-1

8.10.0-2

8.10.1-1~bpo12+1

8.10.1-1

8.10.1-2

8.11.0-1

8.11.1-1~bpo12+1

8.11.1-1

8.12.0+git20250209.89ed161+ds-1~bpo12+1

8.12.0+git20250209.89ed161+ds-1

8.12.1-1

8.12.1-2~bpo12+1

8.12.1-2

8.12.1-3~bpo12+1

8.12.1-3

8.13.0~rc-1~exp1

8.13.0~rc-1~exp2

8.13.0~rc2-1

8.13.0~rc2-2

8.13.0~rc3-1

8.13.0~rc3-1+exp1

8.13.0-1

8.13.0-1+exp1

8.13.0-2

8.13.0-2+exp1

8.13.0-3

8.13.0-4

8.13.0-4+exp1

8.13.0-5~bpo12+1

8.13.0-5

8.13.0-5+exp1

8.14.0~rc1-1+exp1

8.14.0~rc2-1+exp1

8.14.0~rc3-1+exp1

8.14.0-1

8.14.0-1+exp1

8.14.1-1~bpo12+1

8.14.1-1

8.14.1-2~bpo12+1

8.14.1-2

8.14.1-2+exp1

8.15.0~rc1-1exp1

8.15.0~rc2-1~exp1

8.15.0~rc3-1~exp1

8.15.0-1~bpo13+1

8.15.0-1~exp1

8.15.0-1

8.16.0~rc1-1~exp1

8.16.0~rc2-1

8.16.0~rc2-2

8.16.0~rc3-1

8.16.0-1~bpo13+1

8.16.0-1

8.16.0-1+exp1

8.16.0-2

8.16.0-3

8.16.0-4~bpo13+1

8.16.0-4

8.17.0~rc1-1~exp1

8.17.0~rc2-1

8.17.0~rc3-1

8.17.0-1

8.17.0-2

8.17.0-3

8.18.0~rc1-1+exp1

8.18.0~rc2-1

8.18.0~rc3-1

8.18.0-1~bpo13+1

8.18.0-1

8.18.0-2

8.19.0~rc1-1~exp1

8.19.0~rc2-1

8.19.0~rc2-2

8.19.0~rc3-1

8.19.0-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-1965.json"

Debian:12 / curl

Package

Name: curl
Purl: pkg:deb/debian/curl?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

7.*

7.88.1-10

7.88.1-10+deb12u1~bpo11+1

7.88.1-10+deb12u1

7.88.1-10+deb12u2

7.88.1-10+deb12u3~bpo11+1

7.88.1-10+deb12u3

7.88.1-10+deb12u4

7.88.1-10+deb12u5~bpo11+1

7.88.1-10+deb12u5

7.88.1-10+deb12u6~bpo11+1

7.88.1-10+deb12u6

7.88.1-10+deb12u7

7.88.1-10+deb12u8

7.88.1-10+deb12u9

7.88.1-10+deb12u11

7.88.1-10+deb12u12

7.88.1-10+deb12u13

7.88.1-10+deb12u14

7.88.1-11

8.*

8.0.1-1~exp1

8.2.1-1

8.2.1-2~bpo12+1

8.2.1-2

8.3.0-1

8.3.0-2~bpo12+1

8.3.0-2~exp1

8.3.0-2

8.3.0-3

8.4.0-1

8.4.0-2~bpo12+1

8.4.0-2

8.5.0-1

8.5.0-1+exp1

8.5.0-2~bpo12+1

8.5.0-2

8.5.0-2+exp1

8.6.0-1

8.6.0-1.1

8.6.0-2

8.6.0-3

8.6.0-3.1~exp1

8.6.0-3.1~exp2

8.6.0-3.1

8.6.0-3.2

8.6.0-4

8.7.1-1

8.7.1-1+exp1

8.7.1-2

8.7.1-3

8.7.1-4

8.7.1-5~bpo12+1

8.7.1-5

8.7.1-5+exp1

8.8.0-1~bpo12+1

8.8.0-1

8.8.0-1+exp1

8.8.0-1+exp2

8.8.0-2

8.8.0-3

8.8.0-4

8.9.0-1

8.9.0-2

8.9.0-3

8.9.1-1

8.9.1-2~bpo12+1

8.9.1-2

8.10.0-1

8.10.0-2

8.10.1-1~bpo12+1

8.10.1-1

8.10.1-2

8.11.0-1

8.11.1-1~bpo12+1

8.11.1-1

8.12.0+git20250209.89ed161+ds-1~bpo12+1

8.12.0+git20250209.89ed161+ds-1

8.12.1-1

8.12.1-2~bpo12+1

8.12.1-2

8.12.1-3~bpo12+1

8.12.1-3

8.13.0~rc-1~exp1

8.13.0~rc-1~exp2

8.13.0~rc2-1

8.13.0~rc2-2

8.13.0~rc3-1

8.13.0~rc3-1+exp1

8.13.0-1

8.13.0-1+exp1

8.13.0-2

8.13.0-2+exp1

8.13.0-3

8.13.0-4

8.13.0-4+exp1

8.13.0-5~bpo12+1

8.13.0-5

8.13.0-5+exp1

8.14.0~rc1-1+exp1

8.14.0~rc2-1+exp1

8.14.0~rc3-1+exp1

8.14.0-1

8.14.0-1+exp1

8.14.1-1~bpo12+1

8.14.1-1

8.14.1-2~bpo12+1

8.14.1-2

8.14.1-2+exp1

8.15.0~rc1-1exp1

8.15.0~rc2-1~exp1

8.15.0~rc3-1~exp1

8.15.0-1~bpo13+1

8.15.0-1~exp1

8.15.0-1

8.16.0~rc1-1~exp1

8.16.0~rc2-1

8.16.0~rc2-2

8.16.0~rc3-1

8.16.0-1~bpo13+1

8.16.0-1

8.16.0-1+exp1

8.16.0-2

8.16.0-3

8.16.0-4~bpo13+1

8.16.0-4

8.17.0~rc1-1~exp1

8.17.0~rc2-1

8.17.0~rc3-1

8.17.0-1

8.17.0-2

8.17.0-3

8.18.0~rc1-1+exp1

8.18.0~rc2-1

8.18.0~rc3-1

8.18.0-1~bpo13+1

8.18.0-1

8.18.0-2

8.19.0~rc1-1~exp1

8.19.0~rc2-1

8.19.0~rc2-2

8.19.0~rc3-1

8.19.0-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-1965.json"

Debian:13 / curl

Package

Name: curl
Purl: pkg:deb/debian/curl?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

8.*

8.14.1-2

8.14.1-2+deb13u1

8.14.1-2+deb13u2~bpo13+1

8.14.1-2+deb13u2

8.14.1-2+exp1

8.15.0~rc1-1exp1

8.15.0~rc2-1~exp1

8.15.0~rc3-1~exp1

8.15.0-1~bpo13+1

8.15.0-1~exp1

8.15.0-1

8.16.0~rc1-1~exp1

8.16.0~rc2-1

8.16.0~rc2-2

8.16.0~rc3-1

8.16.0-1~bpo13+1

8.16.0-1

8.16.0-1+exp1

8.16.0-2

8.16.0-3

8.16.0-4~bpo13+1

8.16.0-4

8.17.0~rc1-1~exp1

8.17.0~rc2-1

8.17.0~rc3-1

8.17.0-1

8.17.0-2

8.17.0-3

8.18.0~rc1-1+exp1

8.18.0~rc2-1

8.18.0~rc3-1

8.18.0-1~bpo13+1

8.18.0-1

8.18.0-2

8.19.0~rc1-1~exp1

8.19.0~rc2-1

8.19.0~rc2-2

8.19.0~rc3-1

8.19.0-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-1965.json"

Debian:14 / curl

Package

Name: curl
Purl: pkg:deb/debian/curl?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

8.*

8.14.1-2

8.14.1-2+exp1

8.15.0~rc1-1exp1

8.15.0~rc2-1~exp1

8.15.0~rc3-1~exp1

8.15.0-1~bpo13+1

8.15.0-1~exp1

8.15.0-1

8.16.0~rc1-1~exp1

8.16.0~rc2-1

8.16.0~rc2-2

8.16.0~rc3-1

8.16.0-1~bpo13+1

8.16.0-1

8.16.0-1+exp1

8.16.0-2

8.16.0-3

8.16.0-4~bpo13+1

8.16.0-4

8.17.0~rc1-1~exp1

8.17.0~rc2-1

8.17.0~rc3-1

8.17.0-1

8.17.0-2

8.17.0-3

8.18.0~rc1-1+exp1

8.18.0~rc2-1

8.18.0~rc3-1

8.18.0-1~bpo13+1

8.18.0-1

8.18.0-2

8.19.0~rc1-1~exp1

8.19.0~rc2-1

8.19.0~rc2-2

8.19.0~rc3-1

8.19.0-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-1965.json"