CVE-2023-26793
libmodbus v3.1.10 has a heap-based buffer overflow vulnerability in read_io_status function in...
libmodbus v3.1.10 has a heap-based buffer overflow vulnerability in read_io_status function in src/modbus.c.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
libmodbus v3.1.10 has a heap-based buffer overflow vulnerability in read_io_status function in src/modbus.c.
- Record
CVE-2023-26793- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
EUVDEUVD-2023-30586
libmodbus v3.1.10 has a heap-based buffer overflow vulnerability in read_io_status function in src/modbus.c.
- Record
EUVD-2023-30586- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-fqv7-fhq2-929v
libmodbus v3.1.10 has a heap-based buffer overflow vulnerability in read_io_status function in...
libmodbus v3.1.10 has a heap-based buffer overflow vulnerability in read_io_status function in src/modbus.c.
- Record
GHSA-fqv7-fhq2-929v- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
NVD
libmodbus v3.1.10 has a heap-based buffer overflow vulnerability in read_io_status function in src/modbus.c.
- Record
CVE-2023-26793- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
OSV
libmodbus v3.1.10 has a heap-based buffer overflow vulnerability in read_io_status function in src/modbus.c.
- Record
CVE-2023-26793- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVJLSEC-2026-1251
libmodbus v3.1.10 has a heap-based buffer overflow vulnerability in read_io_status function in src/modbus.c.
- Record
JLSEC-2026-1251- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2023-26793
libmodbus v3.1.10 has a heap-based buffer overflow vulnerability in read_io_status function in src/modbus.c.
- Record
UBUNTU-CVE-2023-26793- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
LibModbus_jllJulia |
3.1.10+0 up to 3.1.12+0 | 3.1.12+0 |
libmodbusUbuntu:Pro:14.04:LTS |
All versions, plus listed versions 3.0.4-13.0.5-13.0.5-1ubuntu0.1~esm1 |
None known |
libmodbusUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 3.0.6-13.0.6-1ubuntu0.1~esm1 |
None known |
libmodbusUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 3.0.6-23.0.6-2ubuntu0.1~esm13.0.6-2+deb9u1build0.18.04.1 |
None known |
libmodbusUbuntu:20.04:LTS |
All versions, plus listed versions 3.1.6-13.1.6-2 |
None known |
libmodbusUbuntu:22.04:LTS |
All versions, plus listed versions 3.1.6-2 |
None known |
libmodbusUbuntu:24.04:LTS |
All versions, plus listed versions 3.1.6-2.13.1.10-1ubuntu1 |
None known |
libmodbusUbuntu:25.10 |
All versions, plus listed versions 3.1.11-2 |
None known |
libmodbusUbuntu:26.10 |
All versions, plus listed versions 3.1.11-2build13.2.0-1 |
None known |
libmodbusUbuntu:26.04:LTS |
All versions, plus listed versions 3.1.11-23.1.11-2build1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-26793 is a critical vulnerability (CVSS 9.8) in Libmodbus, published May 1, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.73%, the 54th percentile. Fixed in LibModbus_jll 3.1.12+0.