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  4. CVE 2026 121944 sngrep through 190 infinite loop dos via crafted
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Back to active CVEs
Medium · CVSS 6.8CVE-2026-121944

sngrep through 1.9.0 Infinite Loop DoS via Crafted NFLOG TLVCVE-2026-121944

Answer in brief

CVE-2026-121944 records a Medium severity (CVSS 6.8) vulnerability in sngrep through 1.9.0 Infinite Loop DoS via Crafted NFLOG TLV. The current sources do not mark it as known exploited. The current feed maps irontec/sngrep (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 4, 2026Updated Nov 4, 2026Source checked Nov 4, 2026First seen by HOL Nov 4, 2026Material review Nov 4, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps irontec/sngrep (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
irontec/sngrepgeneric>=0 <=1.9.0Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for irontec/sngrep.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Nov 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 4, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencehackmd.io
  • Source referencevulncheck.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Irontec sngrep through 1.9.0 Out-of-Bounds Stack Read via sip_check_packetSame irontec/sngrep package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-835
Source
CVE List V5
Source checked
Nov 4, 2026
References
4 linked sources
Open source record