Vulnerability · CVE-2026-5773
libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers.
Published May 13, 2026 · catalog updated Oct 18, 2026 · libcurl might in some
Check if you run it
No confirmed exploitation is on record for CVE-2026-5773. EPSS is 0.66%. Act only if a listed version of libcurl might in some is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (libcurl might in some).
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.66%
- Remediation
- Advisory link
- Affected products
- Alpine:v3.21 curl · Alpine:v3.22 curl · Alpine:v3.23 curl · Alpine:v3.24 curl · cpe haxx/curl
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- Alpine:v3.21 curl7.40.0 → 8.14.1-r3
- Alpine:v3.22 curl7.40.0 → 8.14.1-r4
- Alpine:v3.23 curl7.40.0 → 8.20.0-r0
- Alpine:v3.24 curl7.40.0 → 8.20.0-r0
- cpe haxx/curlversion unspecified
How to fix CVE-2026-5773
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-5773. EPSS is 0.66%. Act only if a listed version of libcurl might in some is installed.
Which versions are affected?
Compare what you have installed with 7.40.0 → 8.14.1-r3, 7.40.0 → 8.14.1-r4, 7.40.0 → 8.20.0-r0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-488; CWE-918: Server-Side Request Forgery (SSRF). EPSS 0.66%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
May 13, 2026 · NIST NVD
Detected
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 ex
Sep 15, 2026 · NIST NVD
Updated
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 ex
Oct 18, 2026 · Trivy Vulnerability DB
Fix available
curl fixed in 8.14.1-r3; curl fixed in 8.14.1-r4; curl fixed in 8.20.0-r0; curl fixed in 8.20.0-r0
Oct 18, 2026 · Trivy Vulnerability DB
Fix available
curl fixed in 8.14.1-r3
Oct 18, 2026 · Trivy Vulnerability DB
Fix available
curl fixed in 8.14.1-r4
Oct 18, 2026 · Trivy Vulnerability DB
Fix available
curl fixed in 8.20.0-r0
Oct 18, 2026 · Trivy Vulnerability DB
Updated
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 ex
Sources
- CVE.orgVulnerability recordCVE-2026-5773
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-5773
30-day exploitation probability 0.7%
first.org - NIST NVDVulnerability recordCVE-2026-5773
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
nvd.nist.gov - Trivy Vulnerability DBPackage advisoryALPINE-CVE-2026-5773
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 l
osv.dev
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.