CVE-2026-0799
OOBR and OOBW in libpcap before 1.10.7
- Published
- Updated
- Reserved
- Assigned by
- Tcpdump
Description
In 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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| TcpdumpCNA (assigner) | 3.1 | High8.7 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H |
| NVDNVD · Awaiting Analysis | 3.1 | High8.7 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.11% · top 99% of all CVEs (5 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.7.
Weakness
Affected products
- affected < 1.10.7
What to do
Solution: Upgrade to libpcap 1.10.7.
Workaround: Validate every filter program that has not been produced by a local call to pcap_compile().
Exploitation: A functional exploit exists.
References (1)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-0799)Record last updated .