OOBR in rpcap client in libpcap before 1.10.7

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-18238
StatePUBLISHED
AssignerTcpdump
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-05 19:16:55 UTC
Updated2026-09-05 19:16:55 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Problem Types: CWE-126 | CWE-1288 | CWE-1288 CWE-1288: Improper Validation of Consistency within Input | CWE-126 CWE-126 Buffer Over-read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
3.1CNACVSS5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA The Tcpdump Group Libpcap affected 1.8.x Not specified
CNA The Tcpdump Group Libpcap affected 1.9.x Not specified
CNA The Tcpdump Group Libpcap affected 1.10.x 1.10.7 semver Not specified

References

ReferenceSourceLinkTags
github.com/the-tcpdump-group/libpcap/commit/b9590d482986d64673712460aae1... [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to libpcap 1.10.7.

Exploits

CNA: A functional exploit exists.

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