irontec sngrep up to 1.9.0 NFLOG src/capture.c capture_packet_reasm_ip infinite loop

Summaryinfo

A vulnerability labeled as problematic has been found in irontec sngrep up to 1.9.0. Affected is the function capture_packet_reasm_ip of the file src/capture.c of the component NFLOG Handler. Executing a manipulation can lead to infinite loop. This vulnerability is handled as CVE-2026-121944. It is possible to launch the attack on the local host. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic was found in irontec sngrep up to 1.9.0. This vulnerability affects the function capture_packet_reasm_ip of the file src/capture.c of the component NFLOG Handler. The manipulation with an unknown input leads to a infinite loop vulnerability. The CWE definition for the vulnerability is CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. As an impact it is known to affect availability. CVE summarizes:

sngrep through 1.9.0 contains an infinite loop vulnerability in capture_packet_reasm_ip() in src/capture.c that allows attackers to cause denial of service via crafted NFLOG TLVs. Attackers can supply a pcap file with link type NFLOG containing a non-payload TLV with length under 4, making the capture thread spin at full CPU and stop processing packets.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-121944 since 11/04/2026. The exploitation appears to be easy. The attack needs to be approached locally. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-116901). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• irontec

Name

• sngrep

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9.0

Website

• Product: https://github.com/irontec/sngrep/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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