CVE & CISA-KEV Catalog

CVE-2026-5773

MEDIUM
7.5
CVSS v3
NVD

Description

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.

CWE-918Server-Side Request Forgery (SSRF)

How to fix

Remediation Available
curlDebian
Fixed in:8.20.0~rc2-1CVE-2026-5773
curlRed Hat / RHEL
Fixed in:main@x86_64RHSA-2026:12916
Fixed in:main@aarch64RHSA-2026:12916
Fixed in:main@srcRHSA-2026:12916
curlRocky
Fixed in:main@x86_64RHSA-2026:12916
Fixed in:main@srcRHSA-2026:12916
Fixed in:main@aarch64RHSA-2026:12916
curlUbuntu
Fixed in:7.81.0-1ubuntu1.24USN-8227-1
Fixed in:8.5.0-2ubuntu10.9USN-8227-1
Fixed in:8.14.1-2ubuntu1.3USN-8227-1
libcurl3-gnutlsUbuntu
Fixed in:7.81.0-1ubuntu1.24USN-8227-1
libcurl3-nssUbuntu
Fixed in:7.81.0-1ubuntu1.24USN-8227-1
libcurl3t64-gnutlsUbuntu
Fixed in:8.5.0-2ubuntu10.9USN-8227-1
Fixed in:8.14.1-2ubuntu1.3USN-8227-1
libcurl4Ubuntu
Fixed in:7.81.0-1ubuntu1.24USN-8227-1
libcurl4t64Ubuntu
Fixed in:8.5.0-2ubuntu10.9USN-8227-1
Fixed in:8.14.1-2ubuntu1.3USN-8227-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityNone
AvailabilityNone

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

Exploit Intelligence

0.55%probability of exploitation in 30 days
42ndpercentile

Moderate risk: more likely to be exploited than 42% of all known CVEs.

References

Vendor Advisory1

Related Vulnerabilities

Other CWE-918 (Server-Side Request Forgery (SSRF)) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2024-21893High8.2100%KEV + Ransom-
CVE-2021-40438Critical9.0100%KEVFix
CVE-2021-34473Critical9.1100%KEV + RansomFix
CVE-2021-26855Critical9.1100%KEV + RansomFix
CVE-2021-21985Critical9.8100%KEV + RansomFix
CVE-2022-41040High8.8100%KEV + RansomFix
Embed a live status badge for CVE-2026-5773
CVE-2026-5773 severity badge

Markdown

[![CVE-2026-5773](https://tridentstack.com/cve/badge/CVE-2026-5773.svg)](https://tridentstack.com/cve/CVE-2026-5773)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-5773"><img src="https://tridentstack.com/cve/badge/CVE-2026-5773.svg" alt="CVE-2026-5773"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.