Out-of-bounds Read in Espressif Esp-Idf
CVE-2026-45160
ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.2.7, 5.3.5, 5.4.4, 5.5.4, and 6.0.1, an out-of-bounds read flaw exists in the DHCP server option parser (parse_options() in components/lwip/apps/dhcpserver/dhcpserver.c) shipped with ESP-IDF's lwIP component. The parser walks the BOOTP/DHCP options field without validating that each option's length byte and declared payload length stay within the received packet buffer. A crafted DHCP request can cause the parser to read past the end of the options buffer into adjacent heap memory. The issue affects the DHCP server used by ESP-IDF's SoftAP and any configuration where the device runs as a DHCP server on a local network. This issue has been patched in versions 5.2.8, 5.3.6, 5.4.5, 5.5.5, and 6.0.2.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (31.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
- Espressif Esp-Idf — versions 5.5.4, = 5.2.7, 5.2.7
Weakness classification (CWE)
References
- github.com/espressif/esp-idf/commit/2bf4dd12002dbae60a4b21abff010ecb2b8ee82b (Patch)
- github.com/espressif/esp-idf/commit/2da2db43fd7e0bcff9e7b95f54f388296bb6f911 (Patch)
- github.com/espressif/esp-idf/commit/8b4b5d5301815198d177974ffc24848f47748248 (Patch)
- github.com/espressif/esp-idf/commit/9f713dbc94982d917f2d12964b233cd9efa4aeba (Patch)
- github.com/espressif/esp-idf/commit/d51b1076092487e533eadf8b48c9c8579d3a6712 (Patch)
- github.com/espressif/esp-idf/commit/fba5f995436a3e3139f768b6d8f1a74d5ce1d318 (Patch)
- github.com/espressif/esp-idf/security/advisories/GHSA-g764-gwc3-75m5 (Patch, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-45160?
- CVE-2026-45160 is a medium-severity vulnerability in Espressif Esp-Idf, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-06-10.
- How severe is CVE-2026-45160?
- Medium severity. CVSS v3 base score is 6.5 out of 10.