CVE-2026-48685

Katalog CVE

CVSS 6.5 · Medium EPSS 0,54%

Kerentanan Improper Handling of Length Parameter Inconsistency pada pavel-odintsov fastnetmon. Skor CVSS 3.1 6.5 (Medium) menurut NVD.

Deskripsi (NVD)

FastNetMon Community Edition through 1.2.9 has out-of-bounds memory access because it incorrectly parses BGP path attributes with the extended length flag set. In src/bgp_protocol.hpp, the parse_raw_bgp_attribute() function correctly identifies when extended_length_bit is set and sets length_of_length_field to 2, but then reads only a single byte for the attribute value length (attribute_value_length = value[2] at line 173). Per RFC 4271 Section 4.3, when the Extended Length bit is set, the Attribute Length field is two octets and the value should be read as a 16-bit big-endian integer from value[2] and value[3]. As a result, any attribute longer than 255 bytes has its length silently truncated to the low byte (e.g., 300 bytes = 0x012C is read as 0x2C = 44 bytes). The remaining 256 bytes are then misinterpreted as subsequent attributes, causing cascading parse failures and potential out-of-bounds memory access.

Rincian

Terbit di NVD

26 Mei 2026

Terakhir diubah

24 Juli 2026

Status NVD

Analyzed

CVSS 3.1

6.5 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-130: Improper Handling of Length Parameter Inconsistency

EPSS (30 hari)

0,54% peluang dieksploitasi; lebih tinggi dari 43,6% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48685-bgp-extended-length advisory pihak ketiga
• https://github.com/pavel-odintsov/fastnetmon product
• https://github.com/pavel-odintsov/fastnetmon/blob/master/src/bgp_protocol.hpp product