CVE-2026-8836
lwIP snmpv3 USM snmp_msg.c snmp_parse_inbound_frame stack-based overflow
A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.
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
lwIP snmpv3 USM snmp_msg.c snmp_parse_inbound_frame stack-based overflow
A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.
- Record
CVE-2026-8836- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P - 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/E:P/RL:O/RC:C - CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C - CVSS 2.0
- 10.0
AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:OF/RC:C - Weakness
- CWE-121, CWE-119
- Updated
- 2026-11-02
EUVDEUVD-2026-30793
A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.
- Record
EUVD-2026-30793- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-3w8m-3w76-f6mh
A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame...
A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue.
- Record
GHSA-3w8m-3w76-f6mh- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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 - 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-119
- Updated
- 2026-11-02
NVD
A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.
- Record
CVE-2026-8836- CVSS 4.0
- 8.9 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/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 - 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 - CVSS 2.0
- 10.0 High
AV:N/AC:L/Au:N/C:C/I:C/A:C - Weakness
- CWE-119, CWE-121
- Updated
- 2026-11-02
OSV
lwIP snmpv3 USM snmp_msg.c snmp_parse_inbound_frame stack-based overflow
A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.
- Record
CVE-2026-8836- CVSS 4.0
- 8.9 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P - Weakness
- CWE-119, CWE-121
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-8836
A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.
- Record
DEBIAN-CVE-2026-8836- CVSS 4.0
- 8.9 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/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 - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-8836
A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.
- Record
UBUNTU-CVE-2026-8836- CVSS 4.0
- 8.9 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P - 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
OSVOESA-2026-2480 No score
lwip security update
lwip is a small independent implementation of the TCP/IP protocol suite.
Security Fix(es):
A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue.(CVE-2026-8836)
- Record
OESA-2026-2480- Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
lwipDebian:12 |
All versions, plus listed versions 2.1.3+dfsg1-22.1.3+dfsg1-32.1.3+dfsg1-42.2.0+dfsg1-12.2.0+dfsg1-2 Show 16 moreShow less2.2.0+dfsg1-32.2.0+dfsg1-42.2.0+dfsg1-52.2.0+dfsg1-62.2.0+dfsg1-6.12.2.0+dfsg1-6.1~exp12.2.0+dfsg1-72.2.0+dfsg1-82.2.0+dfsg1-92.2.1+dfsg1-12.2.1+dfsg1-22.2.1+dfsg1-32.2.1+dfsg1-42.2.1+dfsg1-52.2.1+dfsg1-62.2.1+dfsg1-7 |
None known |
lwipDebian:13 |
before 2.2.1+dfsg1-1+deb13u1, plus listed versions 2.2.1+dfsg1-1 |
2.2.1+dfsg1-1+deb13u1 |
lwipDebian:14 |
before 2.2.1+dfsg1-5, plus listed versions 2.2.1+dfsg1-12.2.1+dfsg1-22.2.1+dfsg1-32.2.1+dfsg1-4 |
2.2.1+dfsg1-5 |
lwipopenEuler:24.03-LTS |
before 2.2.0-76.oe2403sp3 | 2.2.0-76.oe2403sp3 |
lwipopenEuler:24.03-LTS-SP1 |
before 2.2.0-76.oe2403sp1 | 2.2.0-76.oe2403sp1 |
lwipopenEuler:24.03-LTS-SP3 |
before 2.2.0-76.oe2403sp3 | 2.2.0-76.oe2403sp3 |
lwipopenEuler:20.03-LTS-SP4 |
before 2.2.0-76.oe2003sp4 | 2.2.0-76.oe2003sp4 |
lwipopenEuler:22.03-LTS-SP4 |
before 2.2.0-76.oe2203sp4 | 2.2.0-76.oe2203sp4 |
lwipUbuntu:Pro:20.04:LTS |
before 2.1.2+dfsg1-4ubuntu0.1~esm1, plus listed versions 2.1.2-32.1.2-5.12.1.2+dfsg1-12.1.2+dfsg1-4 |
2.1.2+dfsg1-4ubuntu0.1~esm1 |
lwipUbuntu:Pro:22.04:LTS |
before 2.1.3+dfsg1-1ubuntu0.1~esm1, plus listed versions 2.1.2+dfsg1-82.1.2+dfsg1-92.1.3+dfsg1-1 |
2.1.3+dfsg1-1ubuntu0.1~esm1 |
Show 4 moreShow less
| Package | Affected | Fixed |
|---|---|---|
lwipUbuntu:Pro:24.04:LTS |
before 2.2.0+dfsg1-6.1ubuntu0.1~esm1, plus listed versions 2.1.3+dfsg1-22.1.3+dfsg1-42.2.0+dfsg1-22.2.0+dfsg1-32.2.0+dfsg1-4 Show 5 moreShow less2.2.0+dfsg1-52.2.0+dfsg1-62.2.0+dfsg1-6.12.2.0+dfsg1-6.1build12.2.0+dfsg1-6.1build2 |
2.2.0+dfsg1-6.1ubuntu0.1~esm1 |
lwipUbuntu:25.10 |
All versions, plus listed versions 2.2.1+dfsg1-12.2.1+dfsg1-2 |
None known |
lwipUbuntu:26.10 |
All versions, plus listed versions 2.2.1+dfsg1-42.2.1+dfsg1-52.2.1+dfsg1-7 |
None known |
lwipUbuntu:Pro:26.04:LTS |
before 2.2.1+dfsg1-4ubuntu0.1~esm1, plus listed versions 2.2.1+dfsg1-22.2.1+dfsg1-32.2.1+dfsg1-4 |
2.2.1+dfsg1-4ubuntu0.1~esm1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| exploits, facts | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-8836 is a critical vulnerability (CVSS 9.3) in lwip, published May 18, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.10%, the 65th percentile. Fixed in lwip 2.2.1+dfsg1-1+deb13u1.
References
vuldb.com/vuln/364474
savannah.nongnu.org/bugs?68055
cgit.git.savannah.gnu.org/cgit/lwip.git/commit?id=0c957ec03054eb6c8205e9c9d1d05d90ada3898c
Show 10 moreShow less
github.com/lwip-tcpip/lwip/commit/0c957ec03054eb6c8205e9c9d1d05d90ada3898c
nvd.nist.gov/vuln/detail/CVE-2026-8836
security-tracker.debian.org/tracker/CVE-2026-8836
openeuler.org/zh/security/security-bulletins/detail?id=openEuler-SA-2026-2480
ubuntu.com/security/CVE-2026-8836
cve.org/CVERecord?id=CVE-2026-8836