TI-2026-35975 Aliases CVE-2026-48690 GHSA-h9r4-jj3x-8857

FastNetMon Community Edition through 1.2.9 contains an integer overflow vulnerability in…

LOW 32CWE-122Published 2026-05-26 · Updated 2026-05-26

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.

Summary

FastNetMon Community Edition through 1.2.9 contains an integer overflow vulnerability in the packet capture buffer allocation. In src/packet_storage.hpp, the allocate_buffer() function computes memory_size_in_bytes as 'buffer_size_in_packets * (max_captured_packet_size + sizeof(fastnetmon_pcap_pkthdr_t)) + sizeof(fastnetmon_pcap_file_header_t)' using unsigned int (32-bit) arithmetic. With max_captured_packet_size=1500 and sizeof(fastnetmon_pcap_pkthdr_t)=16, each packet requires approximately 1516 bytes. If buffer_size_in_packets exceeds approximately 2,832,542, the multiplication overflows, resulting in a much smaller allocation than expected. Subsequent write_packet() calls then write past the allocated buffer, causing heap corruption. The buffer_size_in_packets value is derived from the ban_details_records_count configuration parameter, which is parsed using atoi() with no overflow checking.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00116 1st 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: None
Automatable: No
Technical impact: Total

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:pavel-odintsov:fastnetmon:::::community:::*	up to 1.2.9	Vulnerable	pavel-odintsov

cpe:2.3:a:pavel-odintsov:fastnetmon:*:*:*:*:community:*:*:* Versions up to 1.2.9 Vulnerable ·pavel-odintsov

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2026-48690
2026-10-03 Alias added: GHSA-h9r4-jj3x-8857

References

Advisory 1

https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48690-packet-storage-integer-overflow

Other 2

TI-2026-35974 FastNetMon Community Edition through 1.2.9 contains an off-by-one heap-based buffer… CVSS 3.1CRITICAL 9.8
TI-2026-35971 FastNetMon Community Edition through 1.2.9 contains a stack-based buffer overflow in the… CVSS 3.1CRITICAL 9.8
TI-2026-35976 FastNetMon Community Edition through 1.2.9 contains an integer overflow in the BGP… CVSS 3.1CRITICAL 9.8
TI-2026-35972 FastNetMon Community Edition through 1.2.9 contains an OS command injection vulnerability… CVSS 3.1CRITICAL 9.8
TI-2024-37109 An issue was discovered in FastNetMon Community Edition through 1.2.7. CVSS 3.1HIGH 7.5
TI-2024-37108 An issue was discovered in FastNetMon Community Edition through 1.2.7. CVSS 3.1HIGH 7.5

See all 15 →

Sources

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