CVE-2026-121944
sngrep through 1.9.0 Infinite Loop DoS via Crafted NFLOG TLV
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| sngrep irontec irontec/sngrep
github |
≥ 0; ≤ 1.9.0 (affected, semver)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 6.8 medium |
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | CNA: VulnCheck |
| 3.1 / 5.5 medium |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H | CNA: VulnCheck |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/irontec/sngrep/issues/589CNA: VulnCheck · issue-tracking
- https://hackmd.io/@haindpwn/sngrep-sip-payload-missing-nul-oob-readCNA: VulnCheck · third-party-advisory
- https://github.com/irontec/sngrep/blob/v1.9.0/src/capture.c#L581-L598CNA: VulnCheck · technical-description
- https://www.vulncheck.com/advisories/sngrep-through-1.9.0-infinite-loop-dos-via-crafted-nflog-tlvCNA: VulnCheck · third-party-advisory
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