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CVE-2026-48686

FastNetMon Community Edition through 1.2.9 contains a stack-based buffer overflow in the BGP NLRI (Network Layer Reachability Information) decoder. The function decode_bgp_subnet_encoding_ipv4_raw() in src/bgp_protocol.cpp reads prefix_bit_length directly from the BGP packet (line 99) without validating it is <= 32 for IPv4 prefixes. This value is passed to how_much_bytes_we_need_for_storing_certain_subnet_mask() which computes ceil(prefix_bit_length / 8), returning up to 32 bytes for a prefix_b
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:55275acefc7ec60e456ab3c1648ef3fc66ccce363e775bcc6da555786081117b
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 3 assertions

{"cweId":"CWE-120","description":"CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:88f5f4e5307f20cd7da591cdb09d54ecf30057ffcc6e84556bc76165bdc7c2d1 · sha256:80502559194b295f… · /containers/adp/0/problemTypes/1/descriptions/0

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

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:88f5f4e5307f20cd7da591cdb09d54ecf30057ffcc6e84556bc76165bdc7c2d1 · sha256:80502559194b295f… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-787","description":"CWE-787 Out-of-bounds Write","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:88f5f4e5307f20cd7da591cdb09d54ecf30057ffcc6e84556bc76165bdc7c2d1 · sha256:80502559194b295f… · /containers/adp/0/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:v2:88f5f4e5307f20cd7da591cdb09d54ecf30057ffcc6e84556bc76165bdc7c2d1 · sha256:80502559194b295f… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:88f5f4e5307f20cd7da591cdb09d54ecf30057ffcc6e84556bc76165bdc7c2d1 · sha256:80502559194b295f… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-120","description":"CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:88f5f4e5307f20cd7da591cdb09d54ecf30057ffcc6e84556bc76165bdc7c2d1 · sha256:80502559194b295f… · /containers/adp/0/problemTypes/1/descriptions/0
{"description":"n/a","lang":"en","type":"text"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:88f5f4e5307f20cd7da591cdb09d54ecf30057ffcc6e84556bc76165bdc7c2d1 · sha256:80502559194b295f… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-787","description":"CWE-787 Out-of-bounds Write","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:88f5f4e5307f20cd7da591cdb09d54ecf30057ffcc6e84556bc76165bdc7c2d1 · sha256:80502559194b295f… · /containers/adp/0/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:v2:88f5f4e5307f20cd7da591cdb09d54ecf30057ffcc6e84556bc76165bdc7c2d1 · sha256:80502559194b295f… · /containers/cna/references/0
{"url":"https://github.com/pavel-odintsov/fastnetmon/blob/master/src/bgp_protocol.cpp"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:88f5f4e5307f20cd7da591cdb09d54ecf30057ffcc6e84556bc76165bdc7c2d1 · sha256:80502559194b295f… · /containers/cna/references/1
{"url":"https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48686-bgp-nlri-stack-overflow"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:88f5f4e5307f20cd7da591cdb09d54ecf30057ffcc6e84556bc76165bdc7c2d1 · sha256:80502559194b295f… · /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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