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CVE-2026-112062

lwIP through 2.2.1 Stack Out-of-Bounds Write via mDNS Search Response Handler

6.0 Medium

lwIP through 2.2.1 contains a stack out-of-bounds write vulnerability in mdns_handle_response that allows adjacent attackers to corrupt stack memory by sending mDNS responses with invalid domain names. Attackers on the local link can send multicast PTR answers with oversized RDLENGTH or SRV answers with RDLENGTH below 6 during a service search, overflowing a 256-byte stack buffer and crashing the device.

Attack profile

How easy it is to exploit

Attack vector
Adjacent network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
High

Exploit likelihood

0.36%Up 0.1 points since Oct 19, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.0

lwIP through 2.2.1 Stack Out-of-Bounds Write via mDNS Search Response Handler

lwIP through 2.2.1 contains a stack out-of-bounds write vulnerability in mdns_handle_response that allows adjacent attackers to corrupt stack memory by sending mDNS responses with invalid domain names. Attackers on the local link can send multicast PTR answers with oversized RDLENGTH or SRV answers with RDLENGTH below 6 during a service search, overflowing a 256-byte stack buffer and crashing the device.

Record
CVE-2026-112062
CVSS 4.0
6.0 MediumCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
5.9 MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Weakness
CWE-121
Updated
2026-11-02
EUVDEUVD-2026-103504 6.0

lwIP through 2.2.1 contains a stack out-of-bounds write vulnerability in mdns_handle_response that allows adjacent attackers to corrupt stack memory by sending mDNS responses with invalid domain names. Attackers on the local link can send multicast PTR answers with oversized RDLENGTH or SRV answers with RDLENGTH below 6 during a service search, overflowing a 256-byte stack buffer and crashing the device.

Record
EUVD-2026-103504
CVSS 4.0
6.0 MediumCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-7m6v-7jf3-5x4h 6.0

lwIP through 2.2.1 contains a stack out-of-bounds write vulnerability in mdns_handle_response...

lwIP through 2.2.1 contains a stack out-of-bounds write vulnerability in mdns_handle_response that allows adjacent attackers to corrupt stack memory by sending mDNS responses with invalid domain names. Attackers on the local link can send multicast PTR answers with oversized RDLENGTH or SRV answers with RDLENGTH below 6 during a service search, overflowing a 256-byte stack buffer and crashing the device.

Record
GHSA-7m6v-7jf3-5x4h
CVSS 4.0
6.0 MediumCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/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
5.9 MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Weakness
CWE-121
Updated
2026-11-02
NVD 6.0

lwIP through 2.2.1 contains a stack out-of-bounds write vulnerability in mdns_handle_response that allows adjacent attackers to corrupt stack memory by sending mDNS responses with invalid domain names. Attackers on the local link can send multicast PTR answers with oversized RDLENGTH or SRV answers with RDLENGTH below 6 during a service search, overflowing a 256-byte stack buffer and crashing the device.

Record
CVE-2026-112062
CVSS 4.0
6.0 MediumCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/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
5.9 MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Weakness
CWE-121
Updated
2026-11-02
OSV 6.0

lwIP through 2.2.1 Stack Out-of-Bounds Write via mDNS Search Response Handler

lwIP through 2.2.1 contains a stack out-of-bounds write vulnerability in mdns_handle_response that allows adjacent attackers to corrupt stack memory by sending mDNS responses with invalid domain names. Attackers on the local link can send multicast PTR answers with oversized RDLENGTH or SRV answers with RDLENGTH below 6 during a service search, overflowing a 256-byte stack buffer and crashing the device.

Record
CVE-2026-112062
CVSS 4.0
6.0 MediumCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-121
Updated
2026-11-02
OSVDEBIAN-CVE-2026-112062 6.0

lwIP through 2.2.1 contains a stack out-of-bounds write vulnerability in mdns_handle_response that allows adjacent attackers to corrupt stack memory by sending mDNS responses with invalid domain names. Attackers on the local link can send multicast PTR answers with oversized RDLENGTH or SRV answers with RDLENGTH below 6 during a service search, overflowing a 256-byte stack buffer and crashing the device.

Record
DEBIAN-CVE-2026-112062
CVSS 4.0
6.0 MediumCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/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
Updated
2026-11-02
OSVUBUNTU-CVE-2026-112062 6.0

lwIP through 2.2.1 contains a stack out-of-bounds write vulnerability in mdns_handle_response that allows adjacent attackers to corrupt stack memory by sending mDNS responses with invalid domain names. Attackers on the local link can send multicast PTR answers with oversized RDLENGTH or SRV answers with RDLENGTH below 6 during a service search, overflowing a 256-byte stack buffer and crashing the device.

Record
UBUNTU-CVE-2026-112062
CVSS 4.0
6.0 MediumCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
5.9 MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
lwip
Debian: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 17 moreShow less
2.2.0+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+dfsg1-72.2.1+dfsg1-8
 None known
lwip
Debian:13
 All versions, plus listed versions
2.2.1+dfsg1-12.2.1+dfsg1-1+deb13u12.2.1+dfsg1-22.2.1+dfsg1-32.2.1+dfsg1-4
Show 4 moreShow less
2.2.1+dfsg1-52.2.1+dfsg1-62.2.1+dfsg1-72.2.1+dfsg1-8
 None known
lwip
Debian:14
 All versions, plus listed versions
2.2.1+dfsg1-12.2.1+dfsg1-22.2.1+dfsg1-32.2.1+dfsg1-42.2.1+dfsg1-52.2.1+dfsg1-62.2.1+dfsg1-72.2.1+dfsg1-8
 None known
lwip
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
2.1.2-32.1.2-5.12.1.2+dfsg1-12.1.2+dfsg1-42.1.2+dfsg1-4ubuntu0.1~esm1
 None known
lwip
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
2.1.2+dfsg1-82.1.2+dfsg1-92.1.3+dfsg1-12.1.3+dfsg1-1ubuntu0.1~esm1
 None known
lwip
Ubuntu:Pro:24.04:LTS
 All versions, 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 6 moreShow less
2.2.0+dfsg1-52.2.0+dfsg1-62.2.0+dfsg1-6.12.2.0+dfsg1-6.1build12.2.0+dfsg1-6.1build22.2.0+dfsg1-6.1ubuntu0.1~esm1
 None known
lwip
Ubuntu:26.10
 All versions, plus listed versions
2.2.1+dfsg1-42.2.1+dfsg1-52.2.1+dfsg1-7
 None known
lwip
Ubuntu:Pro:26.04:LTS
 All versions, plus listed versions
2.2.1+dfsg1-22.2.1+dfsg1-32.2.1+dfsg1-42.2.1+dfsg1-4ubuntu0.1~esm1
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-112062 is a medium vulnerability (CVSS 6.0) in Lwip, published October 18, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.36%, the 29th percentile. No source names a fixed version.

References

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