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CVE-2026-48682

FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the IPv4 packet parser. In src/simple_packet_parser_ng.cpp, after validating that the packet contains at least sizeof(ipv4_header_t) bytes (20 bytes), the code advances the local_pointer by '4 * ipv4_header->get_ihl()' (line 164) without validating that (a) IHL >= 5 (the minimum valid value per RFC 791), or (b) 4 * IHL bytes are actually available in the packet. The IHL field is 4 bits, allowing values 0-15, so the adva
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d207c869b3de05b4ed143fd20a13bab17bb36320d774ec2fd3a6be404acbf1ad
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

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

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d7e07caa33ac393fd5cac59b0a1808266d18b499126849d532e95224ce1046a6 · sha256:a9bdead2f3233722… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-125","description":"CWE-125 Out-of-bounds Read","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d7e07caa33ac393fd5cac59b0a1808266d18b499126849d532e95224ce1046a6 · sha256:a9bdead2f3233722… · /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:d7e07caa33ac393fd5cac59b0a1808266d18b499126849d532e95224ce1046a6 · sha256:a9bdead2f3233722… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d7e07caa33ac393fd5cac59b0a1808266d18b499126849d532e95224ce1046a6 · sha256:a9bdead2f3233722… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"description":"n/a","lang":"en","type":"text"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d7e07caa33ac393fd5cac59b0a1808266d18b499126849d532e95224ce1046a6 · sha256:a9bdead2f3233722… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-125","description":"CWE-125 Out-of-bounds Read","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d7e07caa33ac393fd5cac59b0a1808266d18b499126849d532e95224ce1046a6 · sha256:a9bdead2f3233722… · /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:d7e07caa33ac393fd5cac59b0a1808266d18b499126849d532e95224ce1046a6 · sha256:a9bdead2f3233722… · /containers/cna/references/0
{"url":"https://github.com/pavel-odintsov/fastnetmon/blob/master/src/simple_packet_parser_ng.cpp"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d7e07caa33ac393fd5cac59b0a1808266d18b499126849d532e95224ce1046a6 · sha256:a9bdead2f3233722… · /containers/cna/references/1
{"url":"https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48682-ipv4-parser-oob"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d7e07caa33ac393fd5cac59b0a1808266d18b499126849d532e95224ce1046a6 · sha256:a9bdead2f3233722… · /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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