---
title: "CVE-2026-53918: odhcpd - Use After Free"
description: "odhcpd prior to version 25.12 contains a heap-use-after-free caused by improper handling of DHCPv6 IA options in the IA handler, letting unauthenticated adjacent-network attackers cause denial of service and key confusion, exploit requires crafted DHCPv6 REQUEST from adjacent network."
url: https://panop.io/threat-heartbeat/CVE-2026-53918/
---

# CVE-2026-53918 odhcpd - Use After Free

odhcpd prior to version 25.12 contains a heap-use-after-free caused by improper handling of DHCPv6 IA options in the IA handler, letting unauthenticated adjacent-network attackers cause denial of service and key confusion, exploit requires crafted DHCPv6 REQUEST from adjacent network.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.69% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-53918)

## Details

Type

Use After Free

Impact

Denial Of Service

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/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

Published

23 October 2026

Updated

25 October 2026

Weakness

[CWE-416](https://cwe.mitre.org/data/definitions/416.html)

## Vendor fix

Update to version 25.12 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-53918](https://nvd.nist.gov/vuln/detail/CVE-2026-53918)
- [https://github.com/openwrt/odhcpd/commit/26b122007030ebf192376aff8f98d428b25e2a93](https://github.com/openwrt/odhcpd/commit/26b122007030ebf192376aff8f98d428b25e2a93)
- [https://github.com/openwrt/odhcpd/commit/5b283832c0a77aed20f1cc384ffc40bc768b06e9](https://github.com/openwrt/odhcpd/commit/5b283832c0a77aed20f1cc384ffc40bc768b06e9)
- [https://github.com/openwrt/odhcpd/security/advisories/GHSA-44ff-jcwh-wgc2](https://github.com/openwrt/odhcpd/security/advisories/GHSA-44ff-jcwh-wgc2)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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