🛡️ CVE-2026-11586 on Alpine — curl

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

By default, curl automatically responds to WebSocket PING frames. Because curl

lacks an upper bound on memory allocation for unacknowledged frames, a

malicious server can exhaust all available memory by flooding curl with rapid,

sequential PING messages.

Distribution advisory

This page covers CVE-2026-11586 as tracked by Alpine, for the package curl. The fix is available in version 8.21.0-r0; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

ALPINE-CVE-2026-11586 is classified as CWE-770: Allocation of Resources Without Limits. Resources are allocated on request with no cap, so a client can exhaust them.

Affected software

ALPINE-CVE-2026-11586 is recorded against 1 package.

curl (from 8.16.0 up to 8.21.0-r0)

Timeline and source

Published on 3 July 2026 and last revised on 8 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security.alpinelinux.org (Advisory)

Details

Severity Unknown

CVSS Score N/A

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

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2026-07-03

Updated 2026-08-11

Modified 2026-07-08

Fix URL N/A

Affected Packages

Software	From version	Fixed in
curl	8.16.0	8.21.0-r0

References

ADVISORY https://security.alpinelinux.org/vuln/CVE-2026-11586

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