# Zephyr OS vulnerabilities Source: https://junglewise.ai/threats/technologies/zephyr-zephyr-os Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/zephyr-zephyr-os.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 12 vulnerabilities in Zephyr OS: 3 in the last 7 days and 12 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-91007, was published on 12 November 2026. 7 vulnerabilities in the last four weeks, up 250% on the four before (2). ## Counts - Last 7 days: 3 - Last 30 days: 10 - Last 90 days: 12 - All time: 12 (0 critical, 0 exploited in the wild) ## About Zephyr OS Real-time operating system for embedded and IoT devices. ## Latest Zephyr OS vulnerabilities - [CVE-2026-91007: Zephyr charger driver kernel privilege escalation via user-mode syscall verification](https://junglewise.ai/threats/cve-2026-91007-the-user-mode-syscall-verifiers-for-the-charger-driver-api-in) (high, CVSS 7.8, published 12 Nov 2026) - [CVE-2026-90589: Zephyr kernel thread stack memory leak via k_thread_abort](https://junglewise.ai/threats/cve-2026-90589-when-config-thread-stack-mem-mapped-is-enabled-each-thread-stack) (medium, CVSS 5.5, published 9 Nov 2026) - [CVE-2026-90587: Zephyr USB host stack null pointer dereference in device enumeration](https://junglewise.ai/threats/cve-2026-90587-usbh-device-init-in-subsys-usb-host-usbh-device-c-rejects-a) (medium, CVSS 4.6, published 9 Nov 2026) - [CVE-2026-87044: Mbed TLS crypto shim driver heap exhaustion via unaborted PSA operations](https://junglewise.ai/threats/cve-2026-87044-the-mbed-tls-crypto-shim-driver-in-drivers-crypto-crypto-mbedtls) (medium, CVSS 6.5, published 4 Nov 2026) - [CVE-2026-87039: Zephyr I2S user-mode syscall verifier unvalidated pointer dereference](https://junglewise.ai/threats/cve-2026-87039-the-user-mode-syscall-verifier-z-vrfy-i2s-configure-in-drivers) (high, CVSS 7.8, published 4 Nov 2026) - [CVE-2026-85033: Zephyr AVRCP Target vendor response buffer leak on disconnection](https://junglewise.ai/threats/cve-2026-85033-the-avrcp-target-role-in-subsys-bluetooth-host-classic-avrcp-c) (medium, CVSS 4.6, published 3 Nov 2026) - [CVE-2026-82389: Zephyr Bluetooth Classic HFP AG stack crash on RFCOMM connection failure](https://junglewise.ai/threats/cve-2026-82389-in-the-bluetooth-classic-hands-free-profile-audio-gateway-role) (medium, CVSS 6.5, published 26 Oct 2026) - [CVE-2026-82388: Zephyr HFP Hands-Free connection denial of service](https://junglewise.ai/threats/cve-2026-82388-bt-hfp-hf-connect-in-subsys-bluetooth-host-classic-hfp-hf-c) (medium, CVSS 5.3, published 26 Oct 2026) - [CVE-2026-81038: Zephyr Object Transfer Service OACP checksum uninitialized memory disclosure](https://junglewise.ai/threats/cve-2026-81038-the-object-transfer-service-server-builds-its-object-action) (high, CVSS 7.1, published 26 Oct 2026) - [CVE-2026-79981: Zephyr DNS resolver predictable source port and transaction ID](https://junglewise.ai/threats/cve-2026-79981-the-dns-stub-resolver-in-subsys-net-lib-dns-resolve-c-binds-one) (medium, CVSS 6.5, published 23 Oct 2026) - [CVE-2026-19737: Zephyr i2s_esp32 null pointer dereference in trigger validation](https://junglewise.ai/threats/cve-2026-19737-i2s-esp32-trigger-check-in-drivers-i2s-i2s-esp32-c-validates-the) (medium, CVSS 5.5, published 11 Oct 2026) - [CVE-2026-17053: Zephyr SMBus syscall privilege escalation in callback removal](https://junglewise.ai/threats/cve-2026-17053-the-smbus-driver-api-exposed-smbus-smbalert-remove-cb-and-smbus) (medium, CVSS 4.4, published 1 Oct 2026) ## Most severe Zephyr OS vulnerabilities - [CVE-2026-91007: Zephyr charger driver kernel privilege escalation via user-mode syscall verification](https://junglewise.ai/threats/cve-2026-91007-the-user-mode-syscall-verifiers-for-the-charger-driver-api-in) (high, CVSS 7.8, published 12 Nov 2026) - [CVE-2026-87039: Zephyr I2S user-mode syscall verifier unvalidated pointer dereference](https://junglewise.ai/threats/cve-2026-87039-the-user-mode-syscall-verifier-z-vrfy-i2s-configure-in-drivers) (high, CVSS 7.8, published 4 Nov 2026) - [CVE-2026-81038: Zephyr Object Transfer Service OACP checksum uninitialized memory disclosure](https://junglewise.ai/threats/cve-2026-81038-the-object-transfer-service-server-builds-its-object-action) (high, CVSS 7.1, published 26 Oct 2026) - [CVE-2026-87044: Mbed TLS crypto shim driver heap exhaustion via unaborted PSA operations](https://junglewise.ai/threats/cve-2026-87044-the-mbed-tls-crypto-shim-driver-in-drivers-crypto-crypto-mbedtls) (medium, CVSS 6.5, published 4 Nov 2026) - [CVE-2026-82389: Zephyr Bluetooth Classic HFP AG stack crash on RFCOMM connection failure](https://junglewise.ai/threats/cve-2026-82389-in-the-bluetooth-classic-hands-free-profile-audio-gateway-role) (medium, CVSS 6.5, published 26 Oct 2026) - [CVE-2026-79981: Zephyr DNS resolver predictable source port and transaction ID](https://junglewise.ai/threats/cve-2026-79981-the-dns-stub-resolver-in-subsys-net-lib-dns-resolve-c-binds-one) (medium, CVSS 6.5, published 23 Oct 2026) - [CVE-2026-90589: Zephyr kernel thread stack memory leak via k_thread_abort](https://junglewise.ai/threats/cve-2026-90589-when-config-thread-stack-mem-mapped-is-enabled-each-thread-stack) (medium, CVSS 5.5, published 9 Nov 2026) - [CVE-2026-19737: Zephyr i2s_esp32 null pointer dereference in trigger validation](https://junglewise.ai/threats/cve-2026-19737-i2s-esp32-trigger-check-in-drivers-i2s-i2s-esp32-c-validates-the) (medium, CVSS 5.5, published 11 Oct 2026) - [CVE-2026-82388: Zephyr HFP Hands-Free connection denial of service](https://junglewise.ai/threats/cve-2026-82388-bt-hfp-hf-connect-in-subsys-bluetooth-host-classic-hfp-hf-c) (medium, CVSS 5.3, published 26 Oct 2026) - [CVE-2026-90587: Zephyr USB host stack null pointer dereference in device enumeration](https://junglewise.ai/threats/cve-2026-90587-usbh-device-init-in-subsys-usb-host-usbh-device-c-rejects-a) (medium, CVSS 4.6, published 9 Nov 2026) ## Vulnerabilities per week 7 vulnerabilities in the last four weeks, up 250% on the four before (2). | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 1 | 0 | 0 | | 5 Oct 2026 | 1 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 1 | 0 | 0 | | 26 Oct 2026 | 3 | 0 | 0 | | 2 Nov 2026 | 3 | 0 | 0 | | 9 Nov 2026 | 3 | 0 | 0 | ## Other Zephyr technologies - [Zephyr RTOS](https://junglewise.ai/threats/technologies/rtos): 25 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Zephyr OS vulnerabilities", https://junglewise.ai/threats/technologies/zephyr-zephyr-os, 13 November 2026.