CVE catalog
CVE-2026-48682
FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the IPv4 packet parser. In src/simple_packet_parser_ng.cpp, after validating that the packet contains at least sizeof(ipv4_
- 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
- Source
- [NVD] · [CVE record]
- EPSS
- 0.27% · Oct 25, 2026
FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the IPv4 packet parser. In src/simple_packet_parser_ng.cpp, after validating that the packet contains at least sizeof(ipv4_header_t) bytes (20 bytes), the code advances the local_pointer by '4 * ipv4_header->get_ihl()' (line 164) without validating that (a) IHL >= 5 (the minimum valid value per RFC 791), or (b) 4 * IHL bytes are actually available in the packet. The IHL field is 4 bits, allowing values 0-15, so the advance can be 0-60 bytes. An IHL value of 15 with only 20 bytes validated causes a 40-byte over-read. An IHL of 0-4 causes the pointer to not advance past the IP header, resulting in the TCP/UDP header being parsed from IP header data (type confusion). This vulnerability is reachable via any packet capture interface.
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 | fastnetmon | sid | 1.2.9-1 | vulnerable |
| Debian | fastnetmon | forky | 1.2.9-1 | vulnerable |
| Debian | fastnetmon | trixie | 1.2.9-0+deb13u1 | vulnerable |
| Debian | fastnetmon | trixie-security | 1.2.9-0+deb13u1 | vulnerable |
| Debian | fastnetmon | bookworm | 1.2.4-2+deb12u1 | vulnerable |
| Debian | fastnetmon | bookworm-security | 1.2.4-2+deb12u1 | vulnerable |
| Cpe | fastnetmon | Not reported | Not reported | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | fastnetmon | source | sid | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | fastnetmon | source | forky | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | fastnetmon | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | fastnetmon | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
Notes
[trixie] fastnetmon: Minor issue [bookworm] fastnetmon: Minor issue, OOB read
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [fastnetmon]Affected
Details (6)
1.2.4-2+deb12u1· amd64 · bookwormAffected
nvd · fastnetmon · debian · bookworm; nvd · fastnetmon · debian · 12
1.2.4-2+deb12u1· arm64 · bookwormAffected
nvd · fastnetmon · debian · bookworm; nvd · fastnetmon · debian · 12
1.2.8-1~bpo12+1· amd64 · bookworm-backportsAffected
nvd · fastnetmon · debian · bookworm; nvd · fastnetmon · debian · 12
1.2.8-1~bpo12+1· arm64 · bookworm-backportsAffected
nvd · fastnetmon · debian · bookworm; nvd · fastnetmon · debian · 12
1.2.4-2+deb12u1· amd64 · bookworm-securityAffected
nvd · fastnetmon · debian · bookworm; nvd · fastnetmon · debian · 12
1.2.4-2+deb12u1· arm64 · bookworm-securityAffected
nvd · fastnetmon · debian · bookworm; nvd · fastnetmon · debian · 12
[Debian 13 (Trixie)]
- [fastnetmon]Affected
Details (4)
1.2.9-0+deb13u1· amd64 · trixieAffected
nvd · fastnetmon · debian · 13
1.2.9-0+deb13u1· arm64 · trixieAffected
nvd · fastnetmon · debian · 13
1.2.9-0+deb13u1· amd64 · trixie-securityAffected
nvd · fastnetmon · debian · 13
1.2.9-0+deb13u1· arm64 · trixie-securityAffected
nvd · fastnetmon · debian · 13
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-48682]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-48682]
- [https://security-tracker.debian.org/tracker/CVE-2026-48682]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48682.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]