CVE-2026-48688: FastNetMon Community Edition through 1.2.9 contains multiple out-of-bounds reads in the BGP MP_REACH_NLRI IPv6

Q: How do I fix CVE-2026-48688?

fastnetmon: upgrade to newer than 1.2.9. Exact commands for each OS are on this page.

Q: Is CVE-2026-48688 being exploited?

CVE-2026-48688 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-48688 affect?

CVE-2026-48688 affects fastnetmon. Severity is high (CVSS 7.5). FastNetMon Community Edition through 1.2.9 contains multiple out-of-bounds reads in the BGP MP_REACH_NLRI IPv6 attribute decoder. The function decode_mp_reach_ipv6() in src/bgp_protocol.cpp contains a TODO comment at line 156 explicitly ack

Q: How urgent is CVE-2026-48688?

Priority 36/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2026-48688 is a high-severity flaw (CVSS 7.5) affecting fastnetmon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FastNetMon Community Edition through 1.2.9 contains multiple out-of-bounds reads in the BGP MP_REACH_NLRI IPv6 attribute decoder. The function decode_mp_reach_ipv6() in src/bgp_protocol.cpp contains a TODO comment at line 156 explicitly acknowledging 'we should add sanity checks to avoid reads after attribute memory block.' The function casts raw pointers to structure types without verifying sufficient data exists (line 158), uses the attacker-co

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-05-26
Last modified	2026-07-24

Publisher (CNA): MITRE · Vendor: pavel-odintsov

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-26 16:16 UTCPublished CVE record published
2026-07-24 11:10 UTCUpdated Record last modified

pavel-odintsov fastnetmon UPGRADE

Affected: <= 1.2.9

Fixed in: newer than 1.2.9

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fastnetmon || rpm -q fastnetmon || fastnetmon --version

2. UPGRADE to newer than 1.2.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fastnetmon

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fastnetmon

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-48688?

fastnetmon: upgrade to newer than 1.2.9. Exact commands for each OS are on this page.

Is CVE-2026-48688 being exploited?

CVE-2026-48688 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-48688 affect?

CVE-2026-48688 affects fastnetmon. Severity is high (CVSS 7.5). FastNetMon Community Edition through 1.2.9 contains multiple out-of-bounds reads in the BGP MP_REACH_NLRI IPv6 attribute decoder. The function decode_mp_reach_ipv6() in src/bgp_protocol.cpp contains a TODO comment at line 156 explicitly ack

How urgent is CVE-2026-48688?

Priority 36/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-48689 CRITICAL 9.8 UPGRADE FastNetMon Community Edition through 1.2.9 contains an off-by-one heap-based buffer overflow in the dynamic_bi
CVE-2026-48686 CRITICAL 9.8 UPGRADE FastNetMon Community Edition through 1.2.9 contains a stack-based buffer overflow in the BGP NLRI (Network Lay
CVE-2026-48691 CRITICAL 9.8 UPGRADE FastNetMon Community Edition through 1.2.9 contains an integer overflow in the BGP AS_PATH attribute encoder
CVE-2026-48684 MEDIUM 6.5 UPGRADE FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the NetFlow v9 options template p
CVE-2026-48692 HIGH 8.1 UPGRADE FastNetMon Community Edition through 1.2.9 exposes a gRPC API server on port 50052 with no authentication mech

References

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