Answer in brief
CVE-2026-18238 records a Medium severity (CVSS 5.0) vulnerability in OOBR in rpcap client in libpcap before 1.10.7. The current sources do not mark it as known exploited. The current feed maps The Tcpdump Group/libpcap (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 5.0. 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 The Tcpdump Group/libpcap (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| The Tcpdump Group/libpcapgeneric | 1.8.x || 1.9.x || >=1.10.x <1.10.7 | 1.10.7 |
Published upstream
Sep 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 5, 2026
The rpcap client code that processes a RPCAP_MSG_PACKET message received from the server incorrectly validates its headers. A malicious server can send a crafted message and cause the client to treat up to 20 bytes of the client process memory beyond the end of the buffer as if it was a part of the captured packet.
Quoted source text, attributed separately from HOL analysis.