CVE catalog
CVE-2026-18238
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
- Severity
- High · CVSS 8.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.18% · Oct 25, 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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libpcap | sid | 1.11.0-1 | fixed |
| Debian | libpcap | forky | 1.11.0-1 | fixed |
| Debian | libpcap | trixie | 1.10.5-2 | vulnerable |
| Debian | libpcap | bookworm | 1.10.3-1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libpcap | source | sid | 1.10.7-1 | unimportant | Not reported | [1146825] |
| Debian | libpcap | source | forky | 1.10.7-1 | unimportant | Not reported | [1146825] |
| Debian | libpcap | source | trixie | (unfixed) | unimportant | Not reported | [1146825] |
| Debian | libpcap | source | bookworm | (unfixed) | unimportant | Not reported | [1146825] |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libpcap0.8]Affected
Source package: [libpcap]
Details (2)
1.10.3-1· amd64 · bookwormAffected
nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12
1.10.3-1· arm64 · bookwormAffected
nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12
- [libpcap0.8-dev]Affected
Source package: [libpcap]
Details (2)
1.10.3-1· amd64 · bookwormAffected
nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12
1.10.3-1· arm64 · bookwormAffected
nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12
- [libpcap-dev]Affected
Source package: [libpcap]
Details (2)
1.10.3-1· amd64 · bookwormAffected
nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12
1.10.3-1· arm64 · bookwormAffected
nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12
[Debian 13 (Trixie)]
- [libpcap0.8-dev]Affected
Source package: [libpcap]
Details (2)
1.10.5-2· amd64 · trixieAffected
nvd · libpcap · debian · 13
1.10.5-2· arm64 · trixieAffected
nvd · libpcap · debian · 13
- [libpcap0.8t64]Affected
Source package: [libpcap]
Details (2)
1.10.5-2· amd64 · trixieAffected
nvd · libpcap · debian · 13
1.10.5-2· arm64 · trixieAffected
nvd · libpcap · debian · 13
- [libpcap-dev]Affected
Source package: [libpcap]
Details (2)
1.10.5-2· amd64 · trixieAffected
nvd · libpcap · debian · 13
1.10.5-2· arm64 · trixieAffected
nvd · libpcap · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11744-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-18238]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-18238]
- [https://security-tracker.debian.org/tracker/CVE-2026-18238]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18238.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]