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PatchSiren cyber security CVE debrief

CVE-2026-45160 espressif CVE debrief

CVE-2026-45160 is an out-of-bounds read flaw 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.

Vendor
espressif
Product
esp-idf
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-11
Advisory published
2026-06-10
Advisory updated
2026-06-11

Who should care

Users of Espressif ESP-IDF versions 5.2.7, 5.3.5, 5.4.4, 5.5.4, and 6.0.1 who use the DHCP server feature, especially in SoftAP configurations or where the device acts as a DHCP server on a local network.

Technical summary

The vulnerability exists in the DHCP server option parser. It allows an attacker to send a crafted DHCP request that can cause the parser to read past the end of the options buffer into adjacent heap memory, potentially leading to information disclosure.

Defensive priority

MEDIUM

Recommended defensive actions

  • Upgrade to a patched version of ESP-IDF: 5.2.8, 5.3.6, 5.4.5, 5.5.5, or 6.0.2, or later.
  • Avoid using affected versions of ESP-IDF in configurations where the device runs as a DHCP server on a local network.

Evidence notes

The CVE-2026-45160 issue has been patched in versions 5.2.8, 5.3.6, 5.4.5, 5.5.5, and 6.0.2 of ESP-IDF.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-45160 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-45160

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-45160 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-45160

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.