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CVE-2026-121943

Irontec sngrep through 1.9.0 Out-of-Bounds Stack Read via sip_check_packet

6.3 Medium

Irontec sngrep through 1.9.0 contains an out-of-bounds stack read vulnerability in sip_check_packet and sip_validate_packet caused by an off-by-one length check on 10240-byte SIP payloads. Remote attackers can send a crafted UDP or TCP SIP packet or supply a pcap file to crash sngrep or leak adjacent stack bytes into displayed SIP fields.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
Low

Exploit likelihood

5.55%Unchanged since Nov 5, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.3

Irontec sngrep through 1.9.0 Out-of-Bounds Stack Read via sip_check_packet

Irontec sngrep through 1.9.0 contains an out-of-bounds stack read vulnerability in sip_check_packet and sip_validate_packet caused by an off-by-one length check on 10240-byte SIP payloads. Remote attackers can send a crafted UDP or TCP SIP packet or supply a pcap file to crash sngrep or leak adjacent stack bytes into displayed SIP fields.

Record
CVE-2026-121943
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness
CWE-170
Updated
2026-11-04
EUVDEUVD-2026-116900 6.3

Irontec sngrep through 1.9.0 contains an out-of-bounds stack read vulnerability in sip_check_packet and sip_validate_packet caused by an off-by-one length check on 10240-byte SIP payloads. Remote attackers can send a crafted UDP or TCP SIP packet or supply a pcap file to crash sngrep or leak adjacent stack bytes into displayed SIP fields.

Record
EUVD-2026-116900
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
Updated
2026-11-04
GitHub AdvisoriesGHSA-v6rr-x6vh-q7q4 6.3

Irontec sngrep through 1.9.0 contains an out-of-bounds stack read vulnerability in...

Irontec sngrep through 1.9.0 contains an out-of-bounds stack read vulnerability in sip_check_packet and sip_validate_packet caused by an off-by-one length check on 10240-byte SIP payloads. Remote attackers can send a crafted UDP or TCP SIP packet or supply a pcap file to crash sngrep or leak adjacent stack bytes into displayed SIP fields.

Record
GHSA-v6rr-x6vh-q7q4
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/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
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness
CWE-170
Updated
2026-11-04
NVD 6.3

Irontec sngrep through 1.9.0 contains an out-of-bounds stack read vulnerability in sip_check_packet and sip_validate_packet caused by an off-by-one length check on 10240-byte SIP payloads. Remote attackers can send a crafted UDP or TCP SIP packet or supply a pcap file to crash sngrep or leak adjacent stack bytes into displayed SIP fields.

Record
CVE-2026-121943
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/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
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness
CWE-170
Updated
2026-11-04
OSV 6.3

Irontec sngrep through 1.9.0 Out-of-Bounds Stack Read via sip_check_packet

Irontec sngrep through 1.9.0 contains an out-of-bounds stack read vulnerability in sip_check_packet and sip_validate_packet caused by an off-by-one length check on 10240-byte SIP payloads. Remote attackers can send a crafted UDP or TCP SIP packet or supply a pcap file to crash sngrep or leak adjacent stack bytes into displayed SIP fields.

Record
CVE-2026-121943
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-170
Updated
2026-11-05
OSVDEBIAN-CVE-2026-121943 6.3

Irontec sngrep through 1.9.0 contains an out-of-bounds stack read vulnerability in sip_check_packet and sip_validate_packet caused by an off-by-one length check on 10240-byte SIP payloads. Remote attackers can send a crafted UDP or TCP SIP packet or supply a pcap file to crash sngrep or leak adjacent stack bytes into displayed SIP fields.

Record
DEBIAN-CVE-2026-121943
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/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
2026-11-07
OSVUBUNTU-CVE-2026-121943 6.3

Irontec sngrep through 1.9.0 contains an out-of-bounds stack read vulnerability in sip_check_packet and sip_validate_packet caused by an off-by-one length check on 10240-byte SIP payloads. Remote attackers can send a crafted UDP or TCP SIP packet or supply a pcap file to crash sngrep or leak adjacent stack bytes into displayed SIP fields.

Record
UBUNTU-CVE-2026-121943
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Updated
2026-11-06

Affected products

Affected packages

Affected packages
PackageAffectedFixed
sngrep
Debian:12
 All versions, plus listed versions
1.6.0-11.7.0-11.7.0-21.7.0-2~bpo12+11.8.0-1
Show 9 moreShow less
1.8.1-11.8.2-11.8.2-1~bpo12+11.8.3-11.8.3-1~bpo13+11.8.4-11.8.4-1~bpo13+11.8.4-21.9.0-1
 None known
sngrep
Debian:13
 All versions, plus listed versions
1.8.2-11.8.3-11.8.3-1~bpo13+11.8.4-11.8.4-1~bpo13+11.8.4-21.9.0-1
 None known
sngrep
Debian:14
 All versions, plus listed versions
1.8.2-11.8.3-11.8.3-1~bpo13+11.8.4-11.8.4-1~bpo13+11.8.4-21.9.0-1
 None known
sngrep
Ubuntu:16.04:LTS
 All versions, plus listed versions
0.4.1-11.0.0-11.1.0-11.2.0-11.2.0-1build1
 None known
sngrep
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.4.3-11.4.4-11.4.4-21.4.5-1
 None known
sngrep
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.4.6-11.4.6-2
 None known
sngrep
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.4.9-11.4.10-11.4.10-1ubuntu0.1
 None known
sngrep
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.7.0-21.8.0-11.8.0-1build11.8.0-1build2
 None known
sngrep
Ubuntu:26.10
 All versions, plus listed versions
1.8.3-11.8.4-1
 None known
sngrep
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.8.2-11.8.3-1
 None known

History

History
RecordedChangedSources
affected, aliases, referencesOSV
affected, aliases, published, referencesOSV
referencesEUVD, GitHub Advisories, NVD, OSV
referencesCVE List
publishedEUVD
publishedEUVD, NVD
aliases, referencesGitHub Advisories
cwes, references, severity, titleCVE List
first indexedEUVD

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

In short

CVE-2026-121943 is a medium vulnerability (CVSS 6.3) in Irontec Sngrep, published November 4, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 5.55%, the 92nd percentile. No source names a fixed version.

References

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