CVE-2026-121943 Irontec sngrep through 1.9.0 Out-of-Bounds Stack Read via sip_check_packet
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-121943?
CVE-2026-121943 is a medium-severity vulnerability in irontec sngrep, published on 4 Nov 2026.
Official description
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.
Weakness: CWE-170
Which versions are affected by CVE-2026-121943?
How do I fix CVE-2026-121943?
No fix has been published for CVE-2026-121943 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-121943 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-121943 exists.
Sources
Also known as DEBIAN-CVE-2026-121943, GHSA-v6rr-x6vh-q7q4, UBUNTU-CVE-2026-121943.