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CVE-2026-48685

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 Attr
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:b054d4d234d7e38b00c19587d3d9401ab39f5c1184a49d0f5fb890db3b77a71a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-130","description":"CWE-130 Improper Handling of Length Parameter Inconsistency","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c817e73a44391a4665144d4cdda668fdc6cc68cc21bfb821ab31ce467306b838 · sha256:31245a2dba797f7c… · /containers/adp/0/problemTypes/0/descriptions/0

{"description":"n/a","lang":"en","type":"text"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c817e73a44391a4665144d4cdda668fdc6cc68cc21bfb821ab31ce467306b838 · sha256:31245a2dba797f7c… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"n/a","vendor":"n/a","versions":[{"status":"affected","version":"n/a"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c817e73a44391a4665144d4cdda668fdc6cc68cc21bfb821ab31ce467306b838 · sha256:31245a2dba797f7c… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c817e73a44391a4665144d4cdda668fdc6cc68cc21bfb821ab31ce467306b838 · sha256:31245a2dba797f7c… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-130","description":"CWE-130 Improper Handling of Length Parameter Inconsistency","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c817e73a44391a4665144d4cdda668fdc6cc68cc21bfb821ab31ce467306b838 · sha256:31245a2dba797f7c… · /containers/adp/0/problemTypes/0/descriptions/0
{"description":"n/a","lang":"en","type":"text"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c817e73a44391a4665144d4cdda668fdc6cc68cc21bfb821ab31ce467306b838 · sha256:31245a2dba797f7c… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"url":"https://github.com/pavel-odintsov/fastnetmon"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c817e73a44391a4665144d4cdda668fdc6cc68cc21bfb821ab31ce467306b838 · sha256:31245a2dba797f7c… · /containers/cna/references/0
{"url":"https://github.com/pavel-odintsov/fastnetmon/blob/master/src/bgp_protocol.hpp"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c817e73a44391a4665144d4cdda668fdc6cc68cc21bfb821ab31ce467306b838 · sha256:31245a2dba797f7c… · /containers/cna/references/1
{"url":"https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48685-bgp-extended-length"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c817e73a44391a4665144d4cdda668fdc6cc68cc21bfb821ab31ce467306b838 · sha256:31245a2dba797f7c… · /containers/cna/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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