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Curl CVE-2026-11586

| EUVDEUVD-2026-41500 HIGH
Allocation of Resources Without Limits or Throttling (CWE-770)
7.5
CVSS 3.1 · Vendor
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Severity by source

Vendor (CNA) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
6.5 MEDIUM

Network vector as server sends PINGs over WebSocket; UI:R because user must initiate the connection; A:H for memory exhaustion DoS; no confidentiality or integrity impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (CNA).

CVSS VectorVendor

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

Lifecycle Timeline

5
Analysis Updated
Jul 06, 2026 - 16:29 vuln.today
v3 (cvss_changed)
Analysis Updated
Jul 06, 2026 - 16:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 06, 2026 - 16:22 vuln.today
cvss_changed
CVSS changed
Jul 06, 2026 - 16:22 NVD
7.5 (HIGH)
Analysis Generated
Jun 24, 2026 - 18:29 vuln.today

Description PRE-NVD

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

AnalysisAI

Denial of service in curl 8.16.0 through 8.20.0 lets a malicious WebSocket server exhaust all client memory by flooding it with rapid, sequential PING frames. Because curl auto-responds to PINGs by default and imposes no upper bound on memory buffered for unacknowledged frames, the queue of pending PONG responses grows unbounded until the process is OOM-killed. EPSS is low (0.21%, 11th percentile) and there is no public exploit identified at time of analysis, consistent with an availability-only issue affecting the subset of deployments that actually use curl's WebSocket support.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SLES15-SP5-CHOST-BYOS-SAP-CCloud Not-Affected
SLES15-SP6-CHOST-BYOS Not-Affected
SLES15-SP6-CHOST-BYOS-Aliyun Not-Affected
SLES15-SP6-CHOST-BYOS-Azure Not-Affected
SLES15-SP6-CHOST-BYOS-EC2 Not-Affected

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CVE-2026-11586 vulnerability details – vuln.today

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