CVE-2026-7423
mediumpriority · track · 26EPSS 0.002 · 13 %ileEUUSEPSS · scored 2026-10-28
Integer underflow in the ICMP and ICMPv6 echo reply handlers in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent network user to cause a denial of service (device crash) when outgoing ping support is enabled, because header sizes are subtracted from a packet length field without validating the field is large enough, resulting in a heap out-of-bounds read of up to approximately 65KB. To mitigate this issue, users should upgrade to the fixed version when available.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.3–6.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (4)
Products and version ranges known to be affected.
also known as (2)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (10)
External citations — patches, advisories, analysis.
- https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/Patchcnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2026-7423cnnvd
- https://aws.amazon.com/security/security-bulletins/2026-021-aws/enisa_euvd
- https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6enisa_euvd
- https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1enisa_euvd
- https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2renisa_euvd
- https://aws.amazon.com/security/security-bulletins/2026-021-aws/Vendor Advisorynvd
- https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6Release Notesnvd
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