---
title: "CVE-2026-74220: U-Boot - Buffer Overflow"
description: "U-Boot before 2026.10-rc5 contains a buffer overflow caused by improper signed integer handling in nfs_read_reply() in net/nfs-common.c, letting a malicious NFS server corrupt memory or crash the bootloader, exploit requires a malicious NFS server."
url: https://panop.io/threat-heartbeat/CVE-2026-74220/
---

# CVE-2026-74220 U-Boot - Buffer Overflow

U-Boot before 2026.10-rc5 contains a buffer overflow caused by improper signed integer handling in nfs\_read\_reply() in net/nfs-common.c, letting a malicious NFS server corrupt memory or crash the bootloader, exploit requires a malicious NFS server.

CVSS base score 8.2 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.34% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-74220)

## Details

Type

Buffer Overflow

Impact

Denial Of Service, Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Published

29 September 2026

Updated

15 October 2026

Weakness

[CWE-195](https://cwe.mitre.org/data/definitions/195.html)

## Vendor fix

Update to version 2026.10-rc5 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-2026-74220](https://nvd.nist.gov/vuln/detail/CVE-2026-74220)
- [https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-buffer-overflow-via-nfs-read-reply](https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-buffer-overflow-via-nfs-read-reply)
- [https://github.com/u-boot/u-boot](https://github.com/u-boot/u-boot)
- [https://github.com/u-boot/u-boot/blob/v2026.07/net/nfs-common.c#L695](https://github.com/u-boot/u-boot/blob/v2026.07/net/nfs-common.c#L695)
- [https://github.com/u-boot/u-boot/commit/0bbf09859658b8cc9ac13be41af23b516b8ef69a](https://github.com/u-boot/u-boot/commit/0bbf09859658b8cc9ac13be41af23b516b8ef69a)

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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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