CVE-2026-0799

Process-memory access via unchecked BPF scratch index

Published Sep 5, 2026 · Updated Sep 8, 2026

Out-of-bounds memory access in libpcap before 1.10.7 allows local users to read or overwrite process memory via crafted BPF programs. The pcapint_filter_with_aux_data() routine uses the unsigned k field from LD, LDX, ST, and STX instructions as an index into its 16-word scratch array without checking that it is below 16. Reachability requires an application to pass an externally supplied, unvalidated compiled filter to pcap_offline_filter() or bpf_filter(); exploitation reads or overwrites memory in that application's process and can crash it.

CVSS severity8.7
High
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds memory access in libpcap before 1.10.7 allows local users to read or overwrite process memory via crafted BPF programs. The pcapint_filter_with_aux_data() routine uses the unsigned k field from LD, LDX, ST, and STX instructions as an index into its 16-word scratch array without checking that it is below 16. Reachability requires an application to pass an externally supplied, unvalidated compiled filter to pcap_offline_filter() or bpf_filter(); exploitation reads or overwrites memory in that application's process and can crash it.

The record

CVE
CVE-2026-0799
Published
Sep 5, 2026
Updated
Sep 8, 2026
Vendor
The Tcpdump Group
Product
libpcap
Classifications
CWE-129, CWE-125, CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.10.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Tcpdump Group · libpcapversion=0 <1.10.7

Published CVSS scores

8.7The Tcpdump GroupCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-129Improper Validation of Array Index
CWE-125Out-of-bounds Read
CWE-787Out-of-bounds Write

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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