# CVE-2026-114408: NULL pointer dereference in ICMPv6 Packet Too Big processing when the destination table is full

Status: published. Published: 2026-11-02. Updated: 2026-11-02.

In Eclipse ThreadX NetX Duo versions 6.4.5.202504 through 6.5.2.202603a, built with IPv6 path MTU discovery, the ICMPv6 Packet Too Big handler uses the destination-table entry it adds without checking that the add succeeded. A sender on the network can fill the destination table with Packet Too Big messages quoting new destinations, after which the next message makes the IP helper thread dereference a NULL pointer, crashing it on targets that fault on address 0 and stopping all network processing.

## Remediation

- fix: NetX Duo (eclipse threadx): GitHub reports patched versions 6.5.2.202603b. Check the advisory for the affected release branch. (source: GitHub GHSA-xjgr-2wmf-f78j) — https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-xjgr-2wmf-f78j

## Affected products and versions

- Eclipse Foundation / Eclipse ThreadX: ≥ 6.4.5; ≤ 6.5.2.202603a (affected, custom). Source: CNA: eclipse
-  / NetX Duo (NetX Duo): >= 6.4.5.202504, <= 6.5.2.202603a (affected, GitHub advisory range). Source: GitHub GHSA-xjgr-2wmf-f78j

## Severity and prioritization

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: eclipse

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: emo@eclipse.org

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-252, CWE-476

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-xjgr-2wmf-f78j (CNA: eclipse)

- https://gitlab.eclipse.org/security/cve-assignment/-/work_items/482 (CNA: eclipse)

- https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-xjgr-2wmf-f78j (emo@eclipse.org)

- https://gitlab.eclipse.org/security/cve-assignment/-/work_items/482 (emo@eclipse.org)

- https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-xjgr-2wmf-f78j (GitHub Security Advisories; advisory)

## Provenance

- CNA: eclipse: https://www.cve.org/CVERecord?id=CVE-2026-114408; retrieved 2026-11-02; source updated 2026-11-02

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-114408; retrieved 2026-11-02; source updated 2026-11-02

- GitHub Security Advisories: https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-xjgr-2wmf-f78j; retrieved 2026-11-02; source updated 2026-11-01

Revision: ac827c55cabdf35aa9dbe512a2709bda942ae28f61f0c92d15d492445c7000cc

Canonical: https://y2.dev/cve/CVE-2026-114408

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