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CVE-2026-5773

31
FAUCET Score

libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. 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 criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different 'share' than the new subsequent transfer should. This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.

First published: May 13, 2026Last modified: May 13, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 7.40.0, < 8.20.0CPE matchmatch criteria
cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
>= 7.40.0, <= 7.40.0CPE match
cpe:2.3:a:curl:curl:*:*:*:*:*:*:*:*
>= 7.41.0, <= 7.41.0CPE match
cpe:2.3:a:curl:curl:*:*:*:*:*:*:*:*
>= 7.42.0, <= 7.42.0CPE match
cpe:2.3:a:curl:curl:*:*:*:*:*:*:*:*
>= 7.42.1, <= 7.42.1CPE match
cpe:2.3:a:curl:curl:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.62%
Probability of exploitation in next 30 days
EPSS Percentile
46.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0062 is in the 23rd percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (11)

ubuntupatch availablevia ubuntu_usn
Product: curl (jammy)Fixed in: 7.81.0-1ubuntu1.24
ubuntupatch availablevia ubuntu_usn
Product: curl (noble)Fixed in: 8.5.0-2ubuntu10.9
ubuntupatch availablevia ubuntu_usn
Product: curl (questing)Fixed in: 8.14.1-2ubuntu1.3
ubuntupatch availablevia ubuntu_usn
Product: curl (resolute)Fixed in: 8.18.0-1ubuntu2.1
ubuntupatch availablevia ubuntu_usn
Product: curl (bionic)Fixed in: 7.58.0-2ubuntu3.24+esm10
ubuntupatch availablevia ubuntu_usn
Product: curl (focal)Fixed in: 7.68.0-1ubuntu2.25+esm5
ubuntupatch availablevia ubuntu_usn
Product: curl (noble)Fixed in: 8.5.0-2ubuntu10.11
ubuntupatch availablevia ubuntu_usn
Product: curl (questing)Fixed in: 8.14.1-2ubuntu1.5
ubuntupatch availablevia ubuntu_usn
Product: curl (resolute)Fixed in: 8.18.0-1ubuntu2.3
ubuntupatch availablevia ubuntu_usn
Product: curl (trusty)Fixed in: 7.35.0-1ubuntu2.20+esm21
ubuntupatch availablevia ubuntu_usn
Product: curl (xenial)Fixed in: 7.47.0-1ubuntu2.19+esm17

Vendor Advisories (3)

ubuntuUSN-8525-1

curl vulnerabilities

Jul 9, 2026
microsoft2026-May/CVE-2026-5773Moderate

wrong reuse of SMB connection

May 12, 2026
ubuntuUSN-8227-1

curl vulnerabilities

May 4, 2026

References

curl.se / docs/CVE-2026-5773.html
PatchVendor Advisory
curl.se / docs/CVE-2026-5773.json
Vendor Advisory
hackerone.com / reports/3650689
ExploitIssue TrackingThird Party Advisory
openwall.com / lists/oss-security/2026/04/29/9
Mailing ListPatchThird Party Advisory