Vulnerability DatabaseCVE-2026-121943
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CVE-2026-121943
Published:November 04, 2026
Updated:November 06, 2026
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.
Related Resources (8)
https://nvd.nist.gov/vuln/detail/CVE-2026-121943
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121943.json
https://github.com/irontec/sngrep
https://hackmd.io/@haindpwn/cve-2026-121943-121944-sngrep-sip-payload-missing-nul-oob-read
https://www.vulncheck.com/advisories/irontec-sngrep-through-1.9.0-out-of-bounds-stack-read-via-sip-check-packet
https://hackmd.io/@haindpwn/sngrep-sip-payload-missing-nul-oob-read
https://github.com/irontec/sngrep/issues/589
https://github.com/irontec/sngrep/blob/v1.9.0/src/sip.c#L396-L410
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CVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.8
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Improper Null Termination
CWE-170
EPSS
Base Score:
5.55