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TI-2026-85055 Aliases CVE-2026-121944GHSA-5wr4-785p-23qx

Infinite loop in sngrep allows denial of service via crafted pcap

Priority MEDIUM 63CWE-835Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-835.

Summary

Irontec sngrep through 1.9.0 contains an infinite loop in capture_packet_reasm_ip() in src/capture.c, classified as CWE-835. A local attacker without privileges can supply a pcap file with NFLOG link type containing a non-payload TLV with length under 4, causing the capture thread to spin at full CPU and stop processing packets. Exploitation requires a user to process the crafted file.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00237 14th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
irontecsngrepup to 1.9.0—No fix listedCNA
  • sngrep Vendorirontec Affected up to 1.9.0 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for sngrep.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-11-04 Threatist record created from CVE-2026-121944
  2. 2026-11-04 Alias added: GHSA-5wr4-785p-23qx
  3. 2026-11-04 Affected versions changed · Red Hat
  4. 2026-11-04 CVSS score added · Red Hat
  5. 2026-11-04 CISA SSVC decision points changed

References

Advisory 1

Other 2

  • TI-2024-23438 Irontec Sngrep v1.8.1 was discovered to contain a heap buffer overflow via the function… CVSS 3.1HIGH 7.5
  • TI-2023-18152 Sngrep v1.6.0 was discovered to contain a heap buffer overflow via the function… CVSS 3.1HIGH 7.8
  • TI-2023-15298 Sngrep v1.6.0 was discovered to contain a heap buffer overflow via the function… CVSS 3.1HIGH 7.8
  • TI-2023-15297 Sngrep v1.6.0 was discovered to contain a stack buffer overflow via the function packet_set_payload at /src/packet.c. CVSS 3.1HIGH 7.8
  • TI-2026-85054 Out-of-bounds stack read in Irontec sngrep SIP packet parsing CVSS 4.0MEDIUM 6.3
  • TI-2024-02922 Stack-Buffer Overflow in 'Content-Length' and 'Warning' Header Processing in sngrep CVSS 3.1CRITICAL 9.8
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences