ESF-IDF: Remote Null Pointer Dereference in WebSocket Server

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Summary

CVECVE-2026-45541
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-10 02:16:32 UTC
Updated2026-06-10 02:16:32 UTC
DescriptionESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.2.6, 5.3.5, 5.4.4, 5.5.4, and 6.0, a NULL-pointer dereference exists in the WebSocket subprotocol-negotiation path of the esp_http_server component. While parsing the client-supplied Sec-WebSocket-Protocol request header during the WebSocket handshake, the tokenisation result is dereferenced without a NULL check, so a malformed header value can crash the server before any application-level authentication runs. This issue has been patched in versions 5.2.7, 5.3.6, 5.4.5, 5.5.5, and 6.0.1.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-476 | CWE-476 CWE-476: NULL Pointer Dereference

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Espressif Esp-idf affected = 6.0 Not specified
CNA Espressif Esp-idf affected = 5.5.4 Not specified
CNA Espressif Esp-idf affected = 5.4.4 Not specified
CNA Espressif Esp-idf affected = 5.3.5 Not specified
CNA Espressif Esp-idf affected = 5.2.6 Not specified

References

ReferenceSourceLinkTags
github.com/espressif/esp-idf/commit/9fc0ca13b3b85b98d32b98cd9dc8ff9d8264... [email protected] github.com
github.com/espressif/esp-idf/commit/dc46dc51359749e50617eb70d6f9ae298adc... [email protected] github.com
github.com/espressif/esp-idf/commit/0dc4ee7537f3b12350f5966cecacd59bba84... [email protected] github.com
github.com/espressif/esp-idf/commit/00a2f7fbbbd8fe6d04729022e1d5c9a49435... [email protected] github.com
github.com/espressif/esp-idf/commit/37508ab91124ef426a7396d30f79eba11627... [email protected] github.com
github.com/espressif/esp-idf/security/advisories/GHSA-3j8v-xgrq-5vg8 [email protected] github.com
github.com/espressif/esp-idf/commit/f88a47e4f37fb11ae4b0908cd5c80059d831... [email protected] github.com
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