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CVE-2026-11586

high CVSS 7.5 EPSS 0.6%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-11586 applies to, and the release that fixes it where the sources name one.

curl 8.1.2 fixed in 8.16.1

At a glance

Severity
High
CVSS base score
7.5 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.6% probability of exploitation in the next 30 days, higher than 48% of scored vulnerabilities
Weakness
CWE-770
Published
2026-07-03
NVD CVE.org

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