CVE catalog

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

[CVE catalog]

Severity: Critical · CVSS 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: May 18, 2026, 6:45:12 PM UTC
Source: [NVD] · [CVE record]
EPSS: 1.10% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	lwip	sid	`2.2.1+dfsg1-9`	fixed
Debian	lwip	forky	`2.2.1+dfsg1-8`	fixed
Debian	lwip	trixie	`2.2.1+dfsg1-1+deb13u1`	fixed
Debian	lwip	bookworm	`2.1.3+dfsg1-2`	vulnerable
Cpe	lwip	Not reported	`2.2.0+dfsg1-6.1ubuntu0.1~esm1`	fixed
Cpe	liblwip-dev	Not reported	`2.2.0+dfsg1-6.1ubuntu0.1~esm1`	fixed
Cpe	liblwip-doc	Not reported	`2.2.0+dfsg1-6.1ubuntu0.1~esm1`	fixed
Cpe	liblwip0t64	Not reported	`2.2.0+dfsg1-6.1ubuntu0.1~esm1`	fixed
Cpe	lwip	Not reported	Not reported	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	lwip	source	sid	`2.2.1+dfsg1-5`	not yet assigned	Not reported	[1137526]
Debian	lwip	source	forky	`2.2.1+dfsg1-5`	not yet assigned	Not reported	[1137526]
Debian	lwip	source	trixie	`2.2.1+dfsg1-1+deb13u1`	not yet assigned	Not reported	[1137526]
Debian	lwip	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1137526]
Cpe	lwip	cpe	Not reported	`2.2.0+dfsg1-6.1ubuntu0.1~esm1`	Not reported	Not reported	Not reported
Cpe	liblwip-dev	cpe	Not reported	`2.2.0+dfsg1-6.1ubuntu0.1~esm1`	Not reported	Not reported	Not reported
Cpe	liblwip-doc	cpe	Not reported	`2.2.0+dfsg1-6.1ubuntu0.1~esm1`	Not reported	Not reported	Not reported
Cpe	liblwip0t64	cpe	Not reported	`2.2.0+dfsg1-6.1ubuntu0.1~esm1`	Not reported	Not reported	Not reported

[Debian bug #1137526]

Notes

[bookworm] lwip: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[liblwip0]Affected
Source package: [lwip]
Details (2)
- 2.1.3+dfsg1-2 · amd64 · bookworm
  Affected
  nvd · lwip · debian · bookworm; nvd · lwip · debian · 12
- 2.1.3+dfsg1-2 · arm64 · bookworm
  Affected
  nvd · lwip · debian · bookworm; nvd · lwip · debian · 12
[liblwip-dev]Affected
Source package: [lwip]
Details (2)
- 2.1.3+dfsg1-2 · amd64 · bookworm
  Affected
  nvd · lwip · debian · bookworm; nvd · lwip · debian · 12
- 2.1.3+dfsg1-2 · arm64 · bookworm
  Affected
  nvd · lwip · debian · bookworm; nvd · lwip · debian · 12
[liblwip-doc]Affected
Source package: [lwip]
Details (2)
- 2.1.3+dfsg1-2 · all · bookworm
  Affected
  nvd · lwip · debian · bookworm; nvd · lwip · debian · 12
- 2.1.3+dfsg1-2 · all · bookworm
  Affected
  nvd · lwip · debian · bookworm; nvd · lwip · debian · 12

[Debian 13 (Trixie)]

[liblwip0t64]Affected
Source package: [lwip]
Details (2)
- 2.2.1+dfsg1-1 · amd64 · trixie
  Affected · Fixed: 2.2.1+dfsg1-1+deb13u1
  nvd · lwip · debian · 13
- 2.2.1+dfsg1-1 · arm64 · trixie
  Affected · Fixed: 2.2.1+dfsg1-1+deb13u1
  nvd · lwip · debian · 13
[liblwip-dev]Affected
Source package: [lwip]
Details (2)
- 2.2.1+dfsg1-1 · amd64 · trixie
  Affected · Fixed: 2.2.1+dfsg1-1+deb13u1
  nvd · lwip · debian · 13
- 2.2.1+dfsg1-1 · arm64 · trixie
  Affected · Fixed: 2.2.1+dfsg1-1+deb13u1
  nvd · lwip · debian · 13
[liblwip-doc]Affected
Source package: [lwip]
Details (2)
- 2.2.1+dfsg1-1 · all · trixie
  Affected · Fixed: 2.2.1+dfsg1-1+deb13u1
  nvd · lwip · debian · 13
- 2.2.1+dfsg1-1 · all · trixie
  Affected · Fixed: 2.2.1+dfsg1-1+deb13u1
  nvd · lwip · debian · 13

Observed: Oct 23, 2026, 10:03:13 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [Ubuntu Security Notices (USN)]