Get a Demo

Let's Patch It!

Book a short call with one our specialists, we'll walk you through how Endor Patches work, and ask you a few questions about your environment (like your primary programming languages and repository management). We'll also send you an email right after you fill out the form, feel free to reply with any questions you have in advance!

CVE

CVE-2026-71254

nanoMODBUS Server-Side Out-of-Bounds Write in handle_read_file_record()
Back to all
CVE

CVE-2026-71254

nanoMODBUS Server-Side Out-of-Bounds Write in handle_read_file_record()

nanoMODBUS through v1.23.0 contains an out-of-bounds write in the Modbus server-side handlereadfilerecord function (FC 0x14, Read File Record) in nanomodbus.c. The function validates that the total request size does not exceed 245 bytes and that each sub-request's recordlength is at most 124, but it never validates the CUMULATIVE response size across all sub-requests before processing them.

Package Versions Affected

Package Version
patch Availability
No items found.

Automatically patch vulnerabilities without upgrading

Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request

CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71254.json, https://github.com/debevv/nanoMODBUS, https://github.com/debevv/nanoMODBUS/blob/master/nanomodbus.c, https://nvd.nist.gov/vuln/detail/CVE-2026-71254

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00307%
EPSS Percentile
0.22902%
Introduced Version
0
Fix Available
91d6782930ee263bc760f27b0cbc5b82773c5f0d

Fix Critical Vulnerabilities Instantly

Secure your app without upgrading.
Fix Without Upgrading