CVE-2026-48715: radvd is a router advertisement daemon for IPv6

Q: How do I fix CVE-2026-48715?

radvd: upgrade to 2.21. Exact commands for each OS are on this page.

Q: Is CVE-2026-48715 being exploited?

CVE-2026-48715 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-2026-48715 affect?

CVE-2026-48715 affects radvd. Severity is high (CVSS 8.8). radvd is a router advertisement daemon for IPv6. Prior to version 2.21, the `radvdump` utility shipped with radvd contains a stack buffer overflow in the Route Information option parser. When processing a crafted ICMPv6 Router Advertisement

Routine

HIGH 8.8UPGRADE

CVE-2026-48715 is a high-severity flaw (CVSS 8.8) affecting radvd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

radvd is a router advertisement daemon for IPv6. Prior to version 2.21, the `radvdump` utility shipped with radvd contains a stack buffer overflow in the Route Information option parser. When processing a crafted ICMPv6 Router Advertisement, `print_ff()` copies up to 2032 bytes from attacker-controlled packet data into a 16-byte `struct in6_addr` on the stack, overflowing by up to 2016 bytes. Note that the main `radvd` daemon is not affected by t

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-121
Published	2026-06-19
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: radvd.litech

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-19 20:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

radvd.litech radvd UPGRADE

Affected: < 2.21

Fixed in: 2.21

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.21 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade radvd

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-2026-48715?

radvd: upgrade to 2.21. Exact commands for each OS are on this page.

Is CVE-2026-48715 being exploited?

CVE-2026-48715 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-2026-48715 affect?

CVE-2026-48715 affects radvd. Severity is high (CVSS 8.8). radvd is a router advertisement daemon for IPv6. Prior to version 2.21, the `radvdump` utility shipped with radvd contains a stack buffer overflow in the Route Information option parser. When processing a crafted ICMPv6 Router Advertisement

How urgent is CVE-2026-48715?

Priority 37/100. High severity

References

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