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CVE-2026-29972

nanoMODBUS through v1.22.0 has a stack-based buffer overflow in recv_read_registers_res() in nanomodbus.c. When a client calls nmbs_read_holding_registers() or nmbs_read_input_registers(), the library writes register data from the server response to the caller-provided buffer based on the response's byte_count field before validating that byte_count matches the requested quantity. A malicious Modbus TCP server can send a response with byte_count=250 (125 registers) regardless of the requested qu
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:52d72f4ad33e1c1a4909778a5b9967143fa3a9bb7f28a9b2a4d735418662691f
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:f069ebc61481b030fa12bd1652d014c61b08fcd35384102b47e2e29df9081d9c · sha256:a74755c7905dec2d… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-121","description":"CWE-121 Stack-based Buffer Overflow","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f069ebc61481b030fa12bd1652d014c61b08fcd35384102b47e2e29df9081d9c · sha256:a74755c7905dec2d… · /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:f069ebc61481b030fa12bd1652d014c61b08fcd35384102b47e2e29df9081d9c · sha256:a74755c7905dec2d… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:f069ebc61481b030fa12bd1652d014c61b08fcd35384102b47e2e29df9081d9c · sha256:a74755c7905dec2d… · /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:f069ebc61481b030fa12bd1652d014c61b08fcd35384102b47e2e29df9081d9c · sha256:a74755c7905dec2d… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-121","description":"CWE-121 Stack-based Buffer Overflow","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f069ebc61481b030fa12bd1652d014c61b08fcd35384102b47e2e29df9081d9c · sha256:a74755c7905dec2d… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

3 source assertions
{"url":"https://gist.github.com/dwilliams27/a4e26fe747c8561d608f7549804bd85f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f069ebc61481b030fa12bd1652d014c61b08fcd35384102b47e2e29df9081d9c · sha256:a74755c7905dec2d… · /containers/cna/references/2
{"url":"https://github.com/debevv/nanoMODBUS"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f069ebc61481b030fa12bd1652d014c61b08fcd35384102b47e2e29df9081d9c · sha256:a74755c7905dec2d… · /containers/cna/references/0
{"url":"https://github.com/debevv/nanoMODBUS/blob/master/nanomodbus.c#L580-L615"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f069ebc61481b030fa12bd1652d014c61b08fcd35384102b47e2e29df9081d9c · sha256:a74755c7905dec2d… · /containers/cna/references/1

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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