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CVE-2026-46433

lldpd is an implementation of IEEE 802.1ab (LLDP). Prior to version 1.0.22, lldpd_decode() in src/daemon/lldpd.c strips 802.1Q VLAN tags from received Ethernet frames by calling memmove() to shift the frame payload 4 bytes left. The third argument (byte count) is s - 2 * ETHER_ADDR_LEN but should be s - 2 * ETHER_ADDR_LEN - 4, causing a 4-byte heap buffer over-read past the malloc(h_mtu) allocation when the received frame size equals the interface MTU. This issue has been patched in version 1.0.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:41703fa66747785e1e112215856f15906eeeee1f17ed373c0b6677b2d52b08ac
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"lldpd","vendor":"lldpd","versions":[{"status":"affected","version":"< 1.0.22"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2703845c58cc265e1f5317176153605b83cca91816b9f5a7865fc8ab7474038b · sha256:fbe26cc701ce2fa1… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/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:v2:2703845c58cc265e1f5317176153605b83cca91816b9f5a7865fc8ab7474038b · sha256:fbe26cc701ce2fa1… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-125","description":"CWE-125: Out-of-bounds Read","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2703845c58cc265e1f5317176153605b83cca91816b9f5a7865fc8ab7474038b · sha256:fbe26cc701ce2fa1… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6","tags":["x_refsource_MISC"],"url":"https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2703845c58cc265e1f5317176153605b83cca91816b9f5a7865fc8ab7474038b · sha256:fbe26cc701ce2fa1… · /containers/cna/references/2
{"name":"https://github.com/lldpd/lldpd/pull/787","tags":["x_refsource_MISC"],"url":"https://github.com/lldpd/lldpd/pull/787"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2703845c58cc265e1f5317176153605b83cca91816b9f5a7865fc8ab7474038b · sha256:fbe26cc701ce2fa1… · /containers/cna/references/1
{"name":"https://github.com/lldpd/lldpd/releases/tag/1.0.22","tags":["x_refsource_MISC"],"url":"https://github.com/lldpd/lldpd/releases/tag/1.0.22"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2703845c58cc265e1f5317176153605b83cca91816b9f5a7865fc8ab7474038b · sha256:fbe26cc701ce2fa1… · /containers/cna/references/3
{"name":"https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2703845c58cc265e1f5317176153605b83cca91816b9f5a7865fc8ab7474038b · sha256:fbe26cc701ce2fa1… · /containers/cna/references/0

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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