CVE-2026-45542 | ESF-IDF: Heap buffer overflow in protocomm Security2 over Bluetooth

ESF-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 heap buffer overflow exists in the Security Scheme 2 (SRP6a) session-setup path of the protocomm component. The first-phase handler (handle_session_command0() in components/protocomm/src/security/security2.c) trusts the length of a client-supplied protobuf field for the SRP6a username and copies it into a buffer whose size is derived from a narrower destination type. The resulting truncation-versus-copy asymmetry corrupts the heap when an oversized value is supplied. This issue has been patched in versions 5.2.7, 5.3.6, 5.4.5, 5.5.5, and 6.0.1.

Published: 2026-06-09 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]

NVD Status：Analyzed，CVE State: published

View at NVD, CVE.org, EUVD

Conclusion & alert: CVE-2026-45542 is rated Low Risk (37.1/100): CVSS High severity, with low exploitation likelihood (EPSS 0.33%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-45542

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.03%	0.33%	+0.30%
2	2026-06-10	—	0.03%	—

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-45542

CVSS metrics for this CVE.

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.1	3.1	HIGH	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H` Click to expand Attack vector (AV:A) Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	4.2	[email protected]

Weakness enumeration for CVE-2026-45542

CWE-122 MITRE ↗

Affected software / configurations for CVE-2026-45542

Vendor	Product	Version	Raw CPE
espressif	esp-idf	5.2.6	cpe:2.3:a:espressif:esp-idf:5.2.6:::::::*
espressif	esp-idf	5.3.5	cpe:2.3:a:espressif:esp-idf:5.3.5:::::::*
espressif	esp-idf	5.4.4	cpe:2.3:a:espressif:esp-idf:5.4.4:::::::*
espressif	esp-idf	5.5.4	cpe:2.3:a:espressif:esp-idf:5.5.4:::::::*
espressif	esp-idf	6.0	cpe:2.3:a:espressif:esp-idf:6.0:::::::*

References for CVE-2026-45542

URL	Tags
https://github.com/espressif/esp-idf/commit/0ea58d79845ad674d0358d5de246015a68c4cb4f	Patch
https://github.com/espressif/esp-idf/commit/56c3e385611e63162d0f2f8504ac4ae2ccfccef0	Patch
https://github.com/espressif/esp-idf/commit/71eb2dbe6aaef830719ecac8edf409e2992b64b2	Patch
https://github.com/espressif/esp-idf/commit/9b4cacf9cbc69379972de6a2247fcf5af9240961	Patch
https://github.com/espressif/esp-idf/commit/a2f4554f10ba075c98cbc67464db096ba32497cf	Patch
https://github.com/espressif/esp-idf/commit/f5d24a7e919bc5f447091479656b86da6762a103	Patch
https://github.com/espressif/esp-idf/security/advisories/GHSA-9r76-858f-v6jh	Mitigation Patch Vendor Advisory

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