FreeRTOS-Plus-TCP <= V4.4.1: IPv6 RA Prefix truncation DoS
CVE-2026-7425 Published on April 29, 2026
Out-of-Bounds Read in Router Advertisement Option Parser in FreeRTOS-Plus-TCP
Insufficient option length validation in the IPv6 Router Advertisement parser in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to cause a denial of service (device crash) by sending a crafted Router Advertisement with a truncated PREFIX_INFORMATION option that is smaller than the expected structure size.
To mitigate this issue, users should upgrade to the fixed version when available.
Vulnerability Analysis
Weakness Type
Out-of-bounds Read
The software reads data past the end, or before the beginning, of the intended buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash. A crash can occur when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string. The expected sentinel might not be located in the out-of-bounds memory, causing excessive data to be read, leading to a segmentation fault or a buffer overflow. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent read operation then produces undefined or unexpected results.
Products Associated with CVE-2026-7425
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Affected Versions
AWS FreeRTOS-Plus-TCP:- Version 4.0.0 and below 4.2.6 is affected.
- Version 4.3.0 and below 4.4.1 is affected.
- Version 4.2.6 is unaffected.
- Version 4.4.1 is unaffected.