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curl CVE-2026-5773

| EUVDEUVD-2026-29924 HIGH
Server-Side Request Forgery (SSRF) (CWE-918)
7.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SUSE
HIGH
qualitative
Red Hat
6.5 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

4
Analysis Generated
Jun 08, 2026 - 09:55 vuln.today
CVSS changed
May 13, 2026 - 18:22 NVD
7.5 (HIGH)
CVE Published
May 08, 2026 - 06:45 nvd
UNKNOWN (no severity yet)
CVE Published
May 08, 2026 - 06:45 nvd
HIGH 7.5

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

AnalysisAI

Improper SMB connection reuse in curl allows attackers to cause the library to send confidential request data over an attacker-controlled or unintended SMB connection, breaking the expected isolation between connections. The flaw affects a wide range of curl versions used in countless Linux distributions and embedded products, with a CVSS of 7.5 (confidentiality impact only). No public exploit identified at time of analysis, though SSVC marks exploitation as POC and EPSS remains very low (0.02%, 5th percentile).

Technical ContextAI

curl maintains a connection pool to reuse established sessions for performance, matching candidate connections by a set of properties (host, port, credentials, protocol options). For the SMB protocol, the matching logic does not adequately consider all distinguishing attributes, causing curl to reuse a previously established SMB connection for a request that should have opened a new one with different parameters. The root cause maps to CWE-918 (Server-Side Request Forgery): the connection pool effectively lets one request influence the destination/context of another. The affected component is libcurl/curl built with SMB support, identified via cpe:2.3:a:haxx:curl:*, which is embedded in Red Hat and SUSE distributions among many others.

RemediationAI

Upgrade to the fixed curl release referenced on the upstream advisory at https://curl.se/docs/CVE-2026-5773.html; a patch is available from the vendor, though no single fix version was provided in the input data - confirm the patched version from that advisory or your distribution's errata before deploying. Red Hat users should apply RHSA-2026:12916 (https://access.redhat.com/errata/RHSA-2026:12916); SUSE users should track the equivalent SUSE security update. As a compensating control where patching is delayed, disable SMB protocol support in libcurl builds (./configure --disable-smb) or explicitly restrict allowed protocols on the calling side using CURLOPT_PROTOCOLS_STR / --proto to exclude smb and smbs - the trade-off is loss of SMB transfer capability for any legitimate workflow. If SMB must remain enabled, avoid making consecutive curl SMB requests with differing security-relevant parameters from a single process, and prefer short-lived processes that do not retain a connection cache.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 Affected
SLES15-SP5-CHOST-BYOS-SAP-CCloud Fixed
SLES15-SP6-CHOST-BYOS Fixed
SLES15-SP6-CHOST-BYOS-Aliyun Fixed

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CVE-2026-5773 vulnerability details – vuln.today

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