What’s Vulnerable › Vulnerabilities

CVE-2026-48715: radvdump's Route Information Option Parser has a Stack Buffer Overflow

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-19 · updated 2026-10-25
• Weakness: CWE-121

Description

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 the vulnerability. Version 2.21 patches the issue.

Affected products

• radvd-project radvdump: before 2.21 — fixed in 2.21

How to fix

Upgrade to a fixed version: radvd-project radvdump 2.21. Check the vendor advisory for mitigations.

References

• https://github.com/radvd-project/radvd/commit/068bde13e3fd6a5fcdb6859e6a2acd293a325dc5
• https://github.com/radvd-project/radvd/security/advisories/GHSA-52px-gh9p-m379

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