Answer in brief
CVE-2026-54410 records a High severity (CVSS 7.8) vulnerability in nanoMODBUS Off-by-One Buffer Overflow in recv_msg_header() via Crafted MBAP Length Field. The current sources do not mark it as known exploited. The current feed maps debevv/nanoMODBUS (generic), debevv/nanoMODBUS (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps debevv/nanoMODBUS (generic), debevv/nanoMODBUS (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| debevv/nanoMODBUSgeneric | 0 | Not reported |
| debevv/nanoMODBUSgeneric | >=0 <=1.23.0 | Not reported |
Published upstream
Jun 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
nanoMODBUS through v1.23.0 contains an off-by-one buffer overflow in the recv_msg_header function of the Modbus/TCP server that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of the 260-byte receive buffer by sending a crafted MBAP frame whose Length field is set to 255.
Quoted source text, attributed separately from HOL analysis.