OOBR and OOBW in libpcap before 1.10.7

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-0799
StatePUBLISHED
AssignerTcpdump
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-05 19:16:55 UTC
Updated2026-09-05 19:16:55 UTC
DescriptionIn BPF instructions that load/store a value from/to a scratch memory register the register index is an unsigned 32-bit integer and must not exceed 15, but libpcap BPF interpreter does not validate the value. In particular uncommon use cases a crafted filter program can cause the interpreter to try reading and writing the OS process memory in the 16GiB starting at the current stack frame on 64-bit architectures and in the entire address space on 32-bit architectures.

Risk And Classification

Primary CVSS: v3.1 8.7 HIGH from [email protected]

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

Problem Types: CWE-125 | CWE-129 | CWE-787 | CWE-129 CWE-129 Improper Validation of Array Index | CWE-125 CWE-125 Out-of-bounds Read | CWE-787 CWE-787 Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.7HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H
3.1CNACVSS8.7HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA The Tcpdump Group Libpcap affected 1.10.7 semver Not specified

References

ReferenceSourceLinkTags
github.com/the-tcpdump-group/libpcap/commit/48e8960a7108e9e828f9d7bdc7e9... [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Mozilla via the Secure Open Source program (en)

CNA: Include Security (en)

CNA: Denis Ovsienko (en)

Additional Advisory Data

Solutions

CNA: Upgrade to libpcap 1.10.7.

Workarounds

CNA: Validate every filter program that has not been produced by a local call to pcap_compile().

Exploits

CNA: A functional exploit exists.

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