{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-7423 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-7423 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-7423 is a medium-severity vulnerability in AWS FreeRTOS-Plus-TCP, published on 29 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-7423 and fix it if it is affected.\n\nWhat it is: CVE-2026-7423 is a medium-severity vulnerability in AWS FreeRTOS-Plus-TCP, published on 29 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-7423 in the wild and no public exploit code.\n\nAffected product: AWS FreeRTOS-Plus-TCP. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-7423/ (Markdown: https://insights.sbomify.com/CVE-2026-7423/index.md)","id":"CVE-2026-7423","markdown":"https://insights.sbomify.com/CVE-2026-7423/index.md","name":"CVE-2026-7423","record":{"aliases":["GHSA-7r59-2pgv-9v2r"],"analysis":{"component_type":"iot_embedded","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"FreeRTOS TCP stack","requires_auth":"none","summary":"An integer underflow in FreeRTOS-Plus-TCP allows adjacent attackers to cause device crashes via heap out-of-bounds reads when outgoing ping support is enabled.","user_interaction":"not_required","vuln_class":"integer_overflow"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"AMZN","cpe":[{"product":"freertos-plus-tcp","vendor":"amazon"}],"cvss":{"score":6,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-191","name":"Integer Underflow (Wrap or Wraparound)"}],"description":"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.\n\nTo mitigate this issue, users should upgrade to the fixed version when available.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"Integer Underflow in ICMP Echo Reply Processing in FreeRTOS-Plus-TCP","id":"CVE-2026-7423","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"integer_overflow","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP","id":"CVE-2026-7424"},"packages":[],"prev":{"headline":"MAC Address Validation Bypass in FreeRTOS-Plus-TCP IPv4 and IPv6 Packet Processing","id":"CVE-2026-7422"},"products":["FreeRTOS-Plus-TCP"],"published":"2026-04-29","related":[{"cvss_score":9.6,"headline":"FreeRTOS-Plus-TCP Buffer Over-Read in DNS Response Parser","id":"CVE-2024-38373","kev_date_added":null,"published":"2024-06-24"},{"cvss_score":7.2,"headline":"Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP","id":"CVE-2026-7424","kev_date_added":null,"published":"2026-04-29"},{"cvss_score":7.1,"headline":"MAC Address Validation Bypass in FreeRTOS-Plus-TCP IPv4 and IPv6 Packet Processing","id":"CVE-2026-7422","kev_date_added":null,"published":"2026-04-29"},{"cvss_score":6.1,"headline":"Out-of-Bounds Write via Unsanitized Prefix Length in Router Advertisement Processing in FreeRTOS-Plus-TCP","id":"CVE-2026-7426","kev_date_added":null,"published":"2026-04-29"},{"cvss_score":6,"headline":"Out-of-Bounds Read in Router Advertisement Option Parser in FreeRTOS-Plus-TCP","id":"CVE-2026-7425","kev_date_added":null,"published":"2026-04-29"},{"cvss_score":5.3,"headline":"Buffer Over-read when receiving improperly sized ICMPv6 packets in FreeRTOS-Plus-TCP","id":"CVE-2025-11616","kev_date_added":null,"published":"2025-10-10"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-04-29","vendors":["AWS"]},"summary":"An integer underflow in FreeRTOS-Plus-TCP allows adjacent attackers to cause device crashes via heap out-of-bounds reads when outgoing ping support is enabled.","url":"https://insights.sbomify.com/CVE-2026-7423/"}